fix: Timeout Error with CVE-Bin-Tool Database Update/Download

[tvyavaha]

Description

I'm experiencing a timeout error when updating/downloading the database using cve-bin-tool --nvd api2, even with the nvd_key option and --nvd json-mirror. This issue persists across different networks and has prevented me from using the tool effectively.

Also I tried --disable-data-source EPSS option, but still getting the same timed out error.

To reproduce

Steps to reproduce the behaviour:

1. Run this command: cve-bin-tool -l debug --nvd json-mirror -u now --disable-data-source EPSS
   Expected behaviour: No time out error.
   Actual behaviour:

x: ~>cve-bin-tool --nvd json-mirror -u now --disable-data-source EPSS
[06:57:24] INFO     cve_bin_tool - CVE Binary Tool v3.3.1dev0                                                                                                                                                                                                                                                   cli.py:571
           INFO     cve_bin_tool - This product uses the NVD API but is not endorsed or certified by the NVD.                                                                                                                                                                                                   cli.py:572
           INFO     cve_bin_tool - Disabling data source EPSS                                                                                                                                                                                                                                                   cli.py:693
[06:57:55] WARNING  cve_bin_tool.CVEDB - Updating cachedir /home/tvyavaha/.cache/cve-bin-tool                                                                                                                                                                                                                 cvedb.py:665
[06:58:03] INFO     cve_bin_tool - You are running version 3.3.1dev0 of cve-bin-tool but the latest PyPI Version is 3.3.                                                                                                                                                                                     version.py:27
           INFO     cve_bin_tool - Getting NVD CVE data...                                                                                                                                                                                                                                               nvd_source.py:327
           INFO     cve_bin_tool - Getting GitLab Advisory Database CVEs...                                                                                                                                                                                                                               gad_source.py:86
           INFO     cve_bin_tool.CVEDB - Rolling back the cache to its previous state                                                                                                                                                                                                                         cvedb.py:809
           INFO     cve_bin_tool - Getting RedHat CVEs...                                                                                                                                                                                                                                              redhat_source.py:69
Downloading CVEs... ________________________________________ 100% 0:00:00
[07:01:26] INFO     cve_bin_tool - Getting Open Source Vulnerability Database CVEs...                                                                                                                                                                                                                    osv_source.py:161
[07:01:51] ERROR    cve_bin_tool - Unable to fetch OSV CVEs, skipping OSV.                                                                                                                                                                                                                               osv_source.py:376
________________________________ Traceback (most recent call last) _________________________________
_ /usr/local/bin/cve-bin-tool:8 in <module>                                                        _
_                                                                                                  _
_   5 from cve_bin_tool.cli import main                                                            _
_   6 if __name__ == '__main__':                                                                   _
_   7 _   sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])                         _
_ _ 8 _   sys.exit(main())                                                                         _
_   9                                                                                              _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cli.py:808 in main                          _
_                                                                                                  _
_    805 _                                                                                         _
_    806 _   # update db if needed                                                                 _
_    807 _   if db_update != "never":                                                              _
_ _  808 _   _   cvedb_orig.get_cvelist_if_stale()                                                 _
_    809 _   else:                                                                                 _
_    810 _   _   LOGGER.warning("Not verifying CVE DB cache")                                      _
_    811 _   _   if not cvedb_orig.check_cve_entries():                                            _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cvedb.py:281 in get_cvelist_if_stale        _
_                                                                                                  _
_    278 _   _   _   datetime.datetime.today()                                                     _
_    279 _   _   _   - datetime.datetime.fromtimestamp(self.dbpath.stat().st_mtime)                _
_    280 _   _   ) > datetime.timedelta(hours=24):                                                 _
_ _  281 _   _   _   self.refresh_cache_and_update_db()                                            _
_    282 _   _   _   self.time_of_last_update = datetime.datetime.today()                          _
_    283 _   _   else:                                                                             _
_    284 _   _   _   _ = self.get_db_update_date()                                                 _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cvedb.py:268 in refresh_cache_and_update_db _
_                                                                                                  _
_    265 _   _                                                                                     _
_    266 _   _   # if the database isn't open, open it                                             _
_    267 _   _   self.init_database()                                                              _
_ _  268 _   _   self.populate_db()                                                                _
_    269 _   _   self.LOGGER.debug("Updating exploits data.")                                      _
_    270 _   _   self.create_exploit_db()                                                          _
_    271 _   _   self.update_exploits()                                                            _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cvedb.py:483 in populate_db                 _
_                                                                                                  _
_    480 _   _                                                                                     _
_    481 _   _   # EPSS uses metrics table to get the EPSS metric id.                              _
_    482 _   _   # It can't be run before creation of metrics table.                               _
_ _  483 _   _   self.populate_epss()                                                              _
_    484 _   _   self.store_epss_data()                                                            _
_    485 _   _                                                                                     _
_    486 _   _   for idx, data in enumerate(self.data):                                            _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cvedb.py:635 in populate_epss               _
_    632 _   _   Add EPSS data into the database"""                                                _
_    633 _   _   epss = epss_source.Epss_Source()                                                  _
_    634 _   _   cursor = self.db_open_and_get_cursor()                                            _
_ _  635 _   _   self.epss_data = run_coroutine(epss.update_epss(cursor))                          _
_    636 _   _   self.db_close()                                                                   _
_    637 _                                                                                         _
_    638 _   def metric_finder(self, cursor, cve):                                                 _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/async_utils.py:90 in run_coroutine          _
_                                                                                                  _
_    87 _   """                                                                                    _
_    88 _   loop = get_event_loop()                                                                _
_    89 _   aws = asyncio.ensure_future(coro, loop=loop)                                           _
_ _  90 _   result = loop.run_until_complete(aws)                                                  _
_    91 _   return result                                                                          _
_    92                                                                                            _
_    93                                                                                            _
_                                                                                                  _
_ /usr/lib/python3.11/asyncio/base_events.py:653 in run_until_complete                             _
_                                                                                                  _
_    650 _   _   if not future.done():                                                             _
_    651 _   _   _   raise RuntimeError('Event loop stopped before Future completed.')             _
_    652 _   _                                                                                     _
_ _  653 _   _   return future.result()                                                            _
_    654 _                                                                                         _
_    655 _   def stop(self):                                                                       _
_    656 _   _   """Stop running the event loop.                                                   _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/data_sources/epss_source.py:47 in           _
_ update_epss                                                                                      _
_                                                                                                  _
_    44 _   _   _   _     - EPSS percentile                                                        _
_    45 _   _   """                                                                                _
_    46 _   _   self.EPSS_id_finder(cursor)                                                        _
_ _  47 _   _   await self.download_and_parse_epss()                                               _
_    48 _   _   return self.epss_data                                                              _
_    49 _                                                                                          _
_    50 _   async def download_and_parse_epss(self):                                               _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/data_sources/epss_source.py:52 in           _
_ download_and_parse_epss                                                                          _
_                                                                                                  _
_    49 _                                                                                          _
_    50 _   async def download_and_parse_epss(self):                                               _
_    51 _   _   """Downloads and parses the EPSS data from the CSV file."""                        _
_ _  52 _   _   await self.download_epss_data()                                                    _
_    53 _   _   self.epss_data = self.parse_epss_data()                                            _
_    54 _                                                                                          _
_    55 _   async def download_epss_data(self):                                                    _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/data_sources/epss_source.py:93 in           _
_ download_epss_data                                                                               _
_                                                                                                  _
_    90 _   _   else:                                                                              _
_    91 _   _   _   try:                                                                           _
_    92 _   _   _   _   async with aiohttp.ClientSession(headers=HTTP_HEADERS) as session:         _
_ _  93 _   _   _   _   _   async with session.get(self.DATA_SOURCE_LINK) as response:             _
_    94 _   _   _   _   _   _   response.raise_for_status()                                        _
_    95 _   _   _   _   _   _   self.LOGGER.info("Getting EPSS data...")                           _
_    96 _   _   _   _   _   _   decompressed_data = gzip.decompress(await response.read())         _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/client.py:1197 in __aenter__                     _
_                                                                                                  _
_   1194 _   _   return self.__await__()                                                           _
_   1195 _                                                                                         _
_   1196 _   async def __aenter__(self) -> _RetType:                                               _
_ _ 1197 _   _   self._resp = await self._coro                                                     _
_   1198 _   _   return self._resp                                                                 _
_   1199                                                                                           _
_   1200                                                                                           _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/client.py:507 in _request                        _
_                                                                                                  _
_    504 _   _                                                                                     _
_    505 _   _   timer = tm.timer()                                                                _
_    506 _   _   try:                                                                              _
_ _  507 _   _   _   with timer:                                                                   _
_    508 _   _   _   _   while True:                                                               _
_    509 _   _   _   _   _   url, auth_from_url = strip_auth_from_url(url)                         _
_    510 _   _   _   _   _   if auth and auth_from_url:                                            _
_                                                                                                  _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/helpers.py:735 in __exit__                       _
_                                                                                                  _
_    732 _   _   _   self._tasks.pop()                                                             _
_    733 _   _                                                                                     _
_    734 _   _   if exc_type is asyncio.CancelledError and self._cancelled:                        _
_ _  735 _   _   _   raise asyncio.TimeoutError from None                                          _
_    736 _   _   return None                                                                       _
_    737 _                                                                                         _
_    738 _   def timeout(self) -> None:                                                            _
____________________________________________________________________________________________________
TimeoutError
x: ~>

Version/platform info

Version of CVE-bin-tool( e.g. output of cve-bin-tool --version): 3.3.1dev0
Installed from pypi or github? pypi
Operating system: Linux/Windows (other platforms are unsupported but feel free to report issues anyhow)

• On Linux (or Windows Subsystem for Linux) you can run uname -a
  x: ~>uname -a
  Linux x 6.9.0-rc1+ SMP PREEMPT_DYNAMIC Fri Mar 29 08:33:41 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

Python version (e.g. python3 --version): Python 3.11.6
Running in any particular CI environment we should know about? (e.g. Github Actions) No.

[terriko]

Darn, I was hoping that workaround will work.

Fixing this should just involve fixing it so we don't get a stack trace if there's a timeout error, but we might want to also double-check that there's nothing weird with the link we're using for epss data.

[terriko]

I've tried a couple of things but I can't seem to duplicate this myself easily even with an empty database. As tempting as it is to start messing with my routing table to see if I can make it happen, I think it probably makes more sense to just catch the timeout and hope we can work around it with me going in a bit blind? So I'm going to try to do that instead of bashing my head against it trying to figure out why it's happening.

[terriko]

So it turns out the reason --disable-data-source EPSS didn't work is that EPSS wasn't loading in the same way as the other data sources. Le sigh. Fixing it so it could be disabled wasn't too hard, but fixing it so it behaves exactly like the other data sources (including better handling of the timeouts) will take a bit more refactoring. I'm testing a halfway between solution right now to see if it's worth having a halfway solution or if I should just refactor properly.

[terriko]

I've got a tentative fix in #4125 that may work for you. It should at least allow the EPSS data source to be disabled correctly as a workaround, as well as allow it to fail more gracefully. I haven't run it against the full test suite yet so it may need a bit of work still.

[alext-w]

@tvyavaha, did you by any chance run your original attempts behind a proxy? You mentioned switching between networks, but just in case - was there one where HTTPS connections are not/need not be proxied?

I'm facing a similar timeout, and for me it's definitely the proxy, and the reason seems to be that EPSS data source code doesn't seem to support proxies (lines 72 and 92 need to be adjusted in the same way #923 did for cvedb.py).

#4125 is focusing on making it possible to properly disable this data source, but that is a separate story and I wonder if the actual root cause is the same for the issue I observe, and the one you did. If so, I think there's no point in submitting yet another issue on this, and otherwise I'd do that.

[tvyavaha]

@alext-w I reran the command without using a proxy, but it still fails at different points due to 'network unreachable' errors.
``
x: ~>cve-bin-tool -l debug --nvd json-mirror -u now --disable-data-source EPSS
[10:27:30] INFO cve_bin_tool - CVE Binary Tool v3.3.1dev0 cli.py:571
INFO cve_bin_tool - This product uses the NVD API but is not endorsed or certified by the NVD. cli.py:572
DEBUG cve_bin_tool - Processing disabled data sources ['EPSS'] cli.py:686
INFO cve_bin_tool - Disabling data source EPSS cli.py:693
DEBUG cve_bin_tool - Accepted disabled data sources ['EPSS'] cli.py:695
DEBUG cve_bin_tool.CVEDB - Creating backup of cachedir /home/tvyavaha/.cache/cve-bin-tool at /home/tvyavaha/.cache/cve-bin-tool-backup cvedb.py:786
[10:27:57] WARNING cve_bin_tool.CVEDB - Updating cachedir /home/tvyavaha/.cache/cve-bin-tool cvedb.py:665
[10:28:03] DEBUG cve_bin_tool.CVEDB - Updating CVE data. This will take a few minutes. cvedb.py:262
[10:37:03] ERROR cve_bin_tool - An error occurred while fetching https://pypi.org/pypi/cve-bin-tool/json: HTTPSConnectionPool(host='pypi.org', port=443): Max retries util.py:284
exceeded with url: /pypi/cve-bin-tool/json (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7f150ea552d0>: Failed to
establish a new connection: [Errno 101] Network is unreachable'))
WARNING cve_bin_tool - version.py:37
-------------------------- Can't check for the latest version ---------------------------
warning: unable to access 'https://pypi.org/pypi/cve-bin-tool'
Exception details: 'NoneType' object is not subscriptable
Please make sure you have a working internet connection or try again later.

       INFO     cve_bin_tool - Getting NVD CVE data...                                                                                                             nvd_source.py:327
       INFO     cve_bin_tool - Getting GitLab Advisory Database CVEs...                                                                                             gad_source.py:86
       INFO     cve_bin_tool.CVEDB - Rolling back the cache to its previous state                                                                                       cvedb.py:809
       INFO     cve_bin_tool - Getting RedHat CVEs...                                                                                                            redhat_source.py:69
       DEBUG    cve_bin_tool - RedHat - Get request https://access.redhat.com/hydra/rest/securitydata/cve.json?after=2024-06-04                                  redhat_source.py:46

[10:39:18] DEBUG cve_bin_tool - Error while fetching GitLab Advisory Database CVEs : Cannot connect to host gitlab.com:443 ssl:default [Network is unreachable] gad_source.py:345
ERROR cve_bin_tool - Unable to fetch GitLab Advisory Database CVEs, skipping GAD. gad_source.py:346
________________________________ Traceback (most recent call last) _________________________________
_ /usr/local/lib/python3.11/dist-packages/aiohttp/connector.py:1025 in _wrap_create_connection _
_ _
_ 1022 _ _ _ async with ceil_timeout( _
_ 1023 _ _ _ _ timeout.sock_connect, ceil_threshold=timeout.ceil_threshold _
_ 1024 _ _ _ ): _
_ _ 1025 _ _ _ _ return await self._loop.create_connection(*args, **kwargs) _
_ 1026 _ _ except cert_errors as exc: _
_ 1027 _ _ _ raise ClientConnectorCertificateError(req.connection_key, exc) from exc _
_ 1028 _ _ except ssl_errors as exc: _
_ _
_ /usr/lib/python3.11/asyncio/base_events.py:1085 in create_connection _
_ _
_ 1082 _ _ _ _ exceptions = [exc for sub in exceptions for exc in sub] _
_ 1083 _ _ _ _ try: _
_ 1084 _ _ _ _ _ if len(exceptions) == 1: _
_ _ 1085 _ _ _ _ _ _ raise exceptions[0] _
_ 1086 _ _ _ _ _ else: _
_ 1087 _ _ _ _ _ _ # If they all have the same str(), raise one. _
_ 1088 _ _ _ _ _ _ model = str(exceptions[0]) _
_ _
_ /usr/lib/python3.11/asyncio/base_events.py:1069 in create_connection _
_ _
_ 1066 _ _ _ _ # not using happy eyeballs _
_ 1067 _ _ _ _ for addrinfo in infos: _
_ 1068 _ _ _ _ _ try: _
_ _ 1069 _ _ _ _ _ _ sock = await self._connect_sock( _
_ 1070 _ _ _ _ _ _ _ exceptions, addrinfo, laddr_infos) _
_ 1071 _ _ _ _ _ _ break _
_ 1072 _ _ _ _ _ except OSError: _
_ _
_ /usr/lib/python3.11/asyncio/base_events.py:973 in _connect_sock _
_ _
_ 970 _ _ _ _ _ _ raise my_exceptions.pop() _
_ 971 _ _ _ _ _ else: _
_ 972 _ _ _ _ _ _ raise OSError(f"no matching local address with {family=} found") _
_ _ 973 _ _ _ await self.sock_connect(sock, address) _
_ 974 _ _ _ return sock _
_ 975 _ _ except OSError as exc: _
_ 976 _ _ _ my_exceptions.append(exc) _
_ _
_ /usr/lib/python3.11/asyncio/selector_events.py:634 in sock_connect _
_ _
_ 631 _ _ fut = self.create_future() _
_ 632 _ _ self._sock_connect(fut, sock, address) _
_ 633 _ _ try: _
_ _ 634 _ _ _ return await fut _
_ 635 _ _ finally: _
_ 636 _ _ _ # Needed to break cycles when an exception occurs. _
_ 637 _ _ _ fut = None _
_ _
_ /usr/lib/python3.11/asyncio/selector_events.py:642 in _sock_connect _
_ _
_ 639 _ def _sock_connect(self, fut, sock, address): _
_ 640 _ _ fd = sock.fileno() _
_ 641 _ _ try: _
_ _ 642 _ _ _ sock.connect(address) _
_ 643 _ _ except (BlockingIOError, InterruptedError): _
_ 644 _ _ _ # Issue #23618: When the C function connect() fails with EINTR, the _
_ 645 _ _ _ # connection runs in background. We have to wait until the socket _

---

OSError: [Errno 101] Network is unreachable

The above exception was the direct cause of the following exception:
OSError: [Errno 101] Network is unreachable

The above exception was the direct cause of the following exception:

________________________________ Traceback (most recent call last) _________________________________
_ /usr/local/bin/cve-bin-tool:8 in _
_ _
_ 5 from cve_bin_tool.cli import main _
_ 6 if name == 'main': _
_ 7 _ sys.argv[0] = re.sub(r'(-script.pyw|.exe)?$', '', sys.argv[0]) _
_ _ 8 _ sys.exit(main()) _
_ 9 _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cli.py:808 in main _
_ _
_ 805 _ _
_ 806 _ # update db if needed _
_ 807 _ if db_update != "never": _
_ _ 808 _ _ cvedb_orig.get_cvelist_if_stale() _
_ 809 _ else: _
_ 810 _ _ LOGGER.warning("Not verifying CVE DB cache") _
_ 811 _ _ if not cvedb_orig.check_cve_entries(): _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cvedb.py:281 in get_cvelist_if_stale _
_ _
_ 278 _ _ _ datetime.datetime.today() _
_ 279 _ _ _ - datetime.datetime.fromtimestamp(self.dbpath.stat().st_mtime) _
_ 280 _ _ ) > datetime.timedelta(hours=24): _
_ _ 281 _ _ _ self.refresh_cache_and_update_db() _
_ 282 _ _ _ self.time_of_last_update = datetime.datetime.today() _
_ 283 _ _ else: _
_ 284 _ _ _ _ = self.get_db_update_date() _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cvedb.py:264 in refresh_cache_and_update_db _
_ _
_ 261 _ _ """Refresh cached NVD and update CVE database with latest data.""" _
_ 262 _ _ self.LOGGER.debug("Updating CVE data. This will take a few minutes.") _
_ 263 _ _ # refresh the nvd cache _
_ _ 264 _ _ run_coroutine(self.refresh()) _
_ 265 _ _ _
_ 265 _ _ _
_ 266 _ _ # if the database isn't open, open it _
_ 267 _ _ self.init_database() _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/async_utils.py:90 in run_coroutine _
_ _
_ 87 _ """ _
_ 88 _ loop = get_event_loop() _
_ 89 _ aws = asyncio.ensure_future(coro, loop=loop) _
_ _ 90 _ result = loop.run_until_complete(aws) _
_ 91 _ return result _
_ 92 _
_ 93 _
_ _
_ /usr/lib/python3.11/asyncio/base_events.py:653 in run_until_complete _
_ _
_ 650 _ _ if not future.done(): _
_ 651 _ _ _ raise RuntimeError('Event loop stopped before Future completed.') _
_ 652 _ _ _
_ _ 653 _ _ return future.result() _
_ 654 _ _
_ 655 _ def stop(self): _
_ 656 _ _ """Stop running the event loop. _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cvedb.py:258 in refresh _
_ _
_ 255 _ _ if self.version_check: _
_ 256 _ _ _ check_latest_version() _
_ 257 _ _ _
_ _ 258 _ _ await self.get_data() _
_ 259 _ _
_ 260 _ def refresh_cache_and_update_db(self) -> None: _
_ 261 _ _ """Refresh cached NVD and update CVE database with latest data.""" _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/cvedb.py:379 in get_data _
_ _
_ 376 _ _ _ if source is not None: _
_ 377 _ _ _ _ tasks.append(source.get_cve_data()) _
_ 378 _ _ _
_ _ 379 _ _ for r in await asyncio.gather(*tasks): _
_ 380 _ _ _ self.data.append(r) _
_ 381 _ _
_ 382 _ def init_database(self) -> None: _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/data_sources/nvd_source.py:93 in _
_ get_cve_data _
_ _
_ 90 _ _
_ 91 _ async def get_cve_data(self): _
_ 92 _ _ """Retrieves the CVE data from the data source.""" _
_ _ 93 _ _ await self.fetch_cves() _
_ 94 _ _ _
_ 95 _ _ if self.nvd_type == "api2": _
_ 96 _ _ _ return self.format_data_api2(self.all_cve_entries), self.source_name _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/data_sources/nvd_source.py:333 in _
_ fetch_cves _
_ _
_ 330 _ _ _ _ self.nist_fetch_using_api(), _
_ 331 _ _ _ ) _
_ 332 _ _ else: _
_ _ 333 _ _ _ nvd_metadata = await asyncio.create_task( _
_ 334 _ _ _ _ self.nist_scrape(self.session), _
_ 335 _ _ _ ) _
_ 336 _
_ _
_ /usr/local/lib/python3.11/dist-packages/cve_bin_tool/data_sources/nvd_source.py:414 in _
_ 415 _ _ _ response.raise_for_status() _
_ 416 _ _ _ page = await response.text() _
_ 417 _ _ _ if self.nvd_type == "json-nvd": _
_ _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/client.py:1197 in aenter _
_ _
_ 1194 _ _ return self.await() _
_ 1195 _ _
_ 1196 _ async def aenter(self) -> _RetType: _
_ _ 1197 _ _ self._resp = await self._coro _
_ 1198 _ _ return self._resp _
_ 1199 _
_ 1200 _
_ _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/client.py:581 in _request _
_ _
_ 578 _ _ _ _ _ _ _ ceil_threshold=real_timeout.ceil_threshold, _
_ 579 _ _ _ _ _ _ ): _
_ 580 _ _ _ _ _ _ _ assert self._connector is not None _
_ _ 581 _ _ _ _ _ _ _ conn = await self._connector.connect( _
_ 582 _ _ _ _ _ _ _ _ req, traces=traces, timeout=real_timeout _
_ 583 _ _ _ _ _ _ _ ) _
_ 584 _ _ _ _ _ except asyncio.TimeoutError as exc: _
_ _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/connector.py:544 in connect _
_ _
_ 541 _ _ _ _ _ await trace.send_connection_create_start() _
_ 542 _ _ _ _
_ 543 _ _ _ try: _
_ _ 544 _ _ _ _ proto = await self._create_connection(req, traces, timeout) _
_ 545 _ _ _ _ if self._closed: _
_ 546 _ _ _ _ _ proto.close() _
_ 547 _ _ _ _ _ raise ClientConnectionError("Connector is closed.") _
_ _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/connector.py:944 in _create_connection _
_ _
_ 941 _ _ if req.proxy: _
_ 942 _ _ _ _, proto = await self._create_proxy_connection(req, traces, timeout) _
_ 943 _ _ else: _
_ _ 944 _ _ _ _, proto = await self._create_direct_connection(req, traces, timeout) _
_ 945 _ _ _
_ 946 _ _ return proto _
_ 947 _
_ _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/connector.py:1257 in _create_direct_connection _
_ _
_ 1254 _ _ _ return transp, proto _
_ 1255 _ _ else: _
_ 1256 _ _ _ assert last_exc is not None _
_ _ 1257 _ _ _ raise last_exc _
_ 1258 _ _
_ 1259 _ async def _create_proxy_connection( _
_ 1260 _ _ self, req: ClientRequest, traces: List["Trace"], timeout: "ClientTimeout" _
_ _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/connector.py:1226 in _create_direct_connection _
_ _
_ 1223 _ _ _ ) _
_ 1224 _ _ _ _
_ 1225 _ _ _ try: _
_ _ 1226 _ _ _ _ transp, proto = await self._wrap_create_connection( _
_ 1227 _ _ _ _ _ self._factory, _
_ 1228 _ _ _ _ _ host, _
_ 1229 _ _ _ _ _ port, _
_ _
_ /usr/local/lib/python3.11/dist-packages/aiohttp/connector.py:1033 in _wrap_create_connection _
_ _
_ 1030 _ _ except OSError as exc: _
_ 1031 _ _ _ if exc.errno is None and isinstance(exc, asyncio.TimeoutError): _
_ 1032 _ _ _ _ raise _
_ _ 1033 _ _ _ raise client_error(req.connection_key, exc) from exc _
_ 1034 _ _
_ 1035 _ def _fail_on_no_start_tls(self, req: "ClientRequest") -> None: _
_ 1036 _ _ """Raise a :py:exc:RuntimeError on missing start_tls(). _

---

ClientConnectorError: Cannot connect to host mirror.cveb.in:443 ssl:default [Network is unreachable]

``

[alext-w]

Let me see if I understand this correctly. By "reran the command without using a proxy", do you mean that you've used a network with direct Internet connection, where no proxy needs to be used? Alternatively, do you mean that the network does have a proxy, but you've deconfigured it before running the cve-bin-tool? This latest error looks like some generic network problem, the proxy one usually manifests itself as a timeout.

More specifically, can you maybe try with all but EPSS and NVD data sources disabled to limit the number of network connections it tries to establsh and see using e.g., netstat whether it successfully connects or at least attempts to?

Something like this:

$ cve-bin-tool -l debug -d CURL,GAD,OSV,REDHAT,RSD -u now <...rest of the command line...>

To illustrate, what I see is the following (with v3.3, the latest release, the network does have a proxy):

$ cve-bin-tool -l debug -d CURL,GAD,OSV,REDHAT,RSD -u now --report --detailed <...>
<...>
[15:04:30] DEBUG    cve_bin_tool.CVEDB - Year 2022 has 24754 CVEs in dataset                           nvd_source.py:505
[15:04:34] DEBUG    cve_bin_tool.CVEDB - Year 2023 has 28085 CVEs in dataset                           nvd_source.py:505
[15:04:36] DEBUG    cve_bin_tool.CVEDB - Year 2024 has 12313 CVEs in dataset                           nvd_source.py:505
[15:04:37] DEBUG    cve_bin_tool.CVEDB - Check database is using latest schema                        cvedb.py:323
           DEBUG    cve_bin_tool.CVEDB - Check database is using latest schema                              cvedb.py:323
           DEBUG    cve_bin_tool.CVEDB - Check database is using latest schema                              cvedb.py:323
           DEBUG    cve_bin_tool.CVEDB - Check database is using latest schema                              cvedb.py:323
           DEBUG    cve_bin_tool.CVEDB - Check database is using latest schema                              cvedb.py:323
<HERE IT STALLS FOR ABOUT 5 MINUTES, WITH NETSTAT INDICATING A DIRECT CONNECTION ATTEMPT, THEN FAILS WITH TimeoutError>

The netstat output looks like this during the stall:

$ netstat -aeptn |grep SYN
tcp        0      1 <my IP>:47948         18.66.233.97:443        SYN_SENT    1000       113280     14591/python

After adding trust_env=True at appropriate places in epss_source.py (and with proxy configured with the usual HTTPS_PROXY), the connection works fine and the DB update and then scan succeeds. Checking with netstat additionally confirms it now does use the proxy.

[tvyavaha]

@alext-w In my scenario, I discovered that a proxy setup was necessary for internet connectivity.
When attempting to use the cve-bin-tool with the following command:

cve-bin-tool --nvd json-mirror -l debug -d CURL,GAD,OSV,REDHAT,RSD -u now -i installed_packages.txt

I encountered a TimeoutError during the "Getting EPSS data..." phase. To resolve this issue,
I modified the epss_source.py file within the cve-bin-tool codebase to make aiohttp.ClientSession honor the proxy environment variables.
The changes I made are as follows:

x: ~/cve-bin-tool>git diff
diff --git a/cve_bin_tool/data_sources/epss_source.py b/cve_bin_tool/data_sources/epss_source.py
index 455dacfa..88505994 100644
--- a/cve_bin_tool/data_sources/epss_source.py
+++ b/cve_bin_tool/data_sources/epss_source.py
@@ -69,7 +69,7 @@ class Epss_Source:
             # Check if the file is older than 24 hours
             if time_difference > timedelta(hours=24):
                 try:
-                    async with aiohttp.ClientSession(headers=HTTP_HEADERS) as session:
+                    async with aiohttp.ClientSession(trust_env=True) as session:
                         async with session.get(self.DATA_SOURCE_LINK) as response:
                             response.raise_for_status()
                             self.LOGGER.info("Getting EPSS data...")
@@ -89,7 +89,7 @@ class Epss_Source:

         else:
             try:
-                async with aiohttp.ClientSession(headers=HTTP_HEADERS) as session:
+                async with aiohttp.ClientSession(trust_env=True) as session:
                     async with session.get(self.DATA_SOURCE_LINK) as response:
                         response.raise_for_status()

By changing the aiohttp.ClientSession initialization to include trust_env=True, the session now respects the system's proxy environment variables.
This modification allowed the cve-bin-tool command to execute successfully without encountering the TimeoutError while fetching EPSS data.

[alext-w]

Ok, thank you. Indeed then it looks like we have a common root cause here and that is the lack of proxy support for the EPSS source, which should be a two-line fix.

[terriko]

That is great news!

That said, I do want to make EPSS a source one can disable correctly, so I"ll finish up #4125 too even though it sounds like it won't be necessary to fix this issue.

[alext-w]

Thank you and yes, I think there's certainly value in being able to disable the EPSS source, so that other fix is much appreciated as well!