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<h1 id="原型链污染"><a href="#原型链污染" class="headerlink" title="原型链污染"></a>原型链污染</h1><h2 id="0x01-原型prototype"><a href="#0x01-原型prototype" class="headerlink" title="0x01 原型prototype"></a>0x01 原型prototype</h2><p> 在<code>js</code>中我们所创建的每一个函数，解析器都会向函数中添加一个属性<code>prototype</code> ，这个属性对应着一个对象，这个对象就是我们所谓的原型对象。如果函数作为普通函数调用prototype没有任何作用。原型对象就相当于一个公共的区域，所有同一个类的实例都可以访问到这个原型对象，我们可以将对象中公有的内容统一设置到原型对象中，当我们访问对象的一个属性或方法时，它会先在自身中寻找，如果有则直接使用，如果没有则会去原型对象中寻找，如果找到则直接使用。</p>
<p><img src="/2021/04/10/%E6%B5%85%E8%B0%88nodejs%E5%8E%9F%E5%9E%8B%E9%93%BE%E6%B1%A1%E6%9F%93/Untitled.png" alt="Untitled"></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">MyClass</span>(<span class="params"></span>)</span>{</span><br><span class="line">}</span><br><span class="line"><span class="comment">//向MyClass的原型中添加属性a</span></span><br><span class="line">MyClass.prototype.a = <span class="number">123</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//向MyClass的原型中添加一个方法</span></span><br><span class="line">MyClass.prototype.sayHello = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>{</span><br><span class="line"> alert(<span class="string">"Hello"</span>);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> mc = <span class="keyword">new</span> MyClass();</span><br><span class="line"><span class="keyword">var</span> mc2 = <span class="keyword">new</span> MyClass();</span><br><span class="line"><span class="comment">//console.log(mc.__proto__ == MyClass.prototype);</span></span><br><span class="line"><span class="comment">//向mc中添加属性a</span></span><br><span class="line">mc.a = <span class="string">"我是mc中的a"</span>;</span><br><span class="line"><span class="built_in">console</span>.log(mc.a);</span><br><span class="line"><span class="built_in">console</span>.log(mc2.a);</span><br></pre></td></tr></table></figure>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Foo</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">this</span>.bar = <span class="number">1</span></span><br><span class="line"> <span class="keyword">this</span>.show = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.bar)</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">(<span class="keyword">new</span> Foo()).show()</span><br></pre></td></tr></table></figure>
<p>但这样写有一个问题，就是每当我们新建一个Foo对象时，<code>this.show = function...</code>就会执行一次，这个<code>show</code>方法实际上是绑定在对象上的，而不是绑定在“类”中。</p>
<p>我希望在创建类的时候只创建一次<code>show</code>方法，这时候就则需要使用原型（prototype）了：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Foo</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">this</span>.bar = <span class="number">1</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">Foo.prototype.show = <span class="function"><span class="keyword">function</span> <span class="title">show</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.bar)</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> foo = <span class="keyword">new</span> Foo()</span><br><span class="line">foo.show()</span><br></pre></td></tr></table></figure>
<p><img src="/2021/04/10/%E6%B5%85%E8%B0%88nodejs%E5%8E%9F%E5%9E%8B%E9%93%BE%E6%B1%A1%E6%9F%93/image-20210410172622709.png" alt="image-20210410172622709"></p>
<p>可以看到<code>b</code>并没有<code>a</code>属性，但是通过原型污染，使<code>b</code>的可以访问到<code>a</code>属性</p>
<h1 id="0x02-JavaScript原型链继承"><a href="#0x02-JavaScript原型链继承" class="headerlink" title="0x02 JavaScript原型链继承"></a>0x02 JavaScript原型链继承</h1><p>所有类对象在实例化的时候将会拥有<code>prototype</code>中的属性和方法，这个特性被用来实现JavaScript中的继承机制。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Father</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">this</span>.first_name = <span class="string">'Dany'</span></span><br><span class="line"> <span class="keyword">this</span>.last_name = <span class="string">'Tom'</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Son</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">this</span>.first_name = <span class="string">'Kimi'</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">Son.prototype = <span class="keyword">new</span> Father()</span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> son = <span class="keyword">new</span> Son()</span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">`Name: <span class="subst">${son.first_name}</span> <span class="subst">${son.last_name}</span>`</span>)</span><br></pre></td></tr></table></figure>
<p><code>Son</code>类继承了<code>Father</code>类的<code>last_name</code>属性，最后输出：<code>Name:Kimi Tom</code></p>
<ol>
<li>在对象<code>Son</code>中寻找<code>last_name</code></li>
<li>找不到，继续在<code>Son.__proto__</code>中寻找<code>last_name</code></li>
<li>如果仍找不到，则继续在<code>Son.__proto__.__proto__</code>中寻找<code>last_name</code></li>
<li>依次寻找，直到找到<code>null</code>结束，<code>Object.prototype</code>的<code>__proto__</code>就是<code>null</code></li>
</ol>
<p><img src="/2021/04/10/%E6%B5%85%E8%B0%88nodejs%E5%8E%9F%E5%9E%8B%E9%93%BE%E6%B1%A1%E6%9F%93/image-20210410194330826.png" alt="image-20210410194330826"></p>
<h2 id="0x03-原型链污染"><a href="#0x03-原型链污染" class="headerlink" title="0x03 原型链污染"></a>0x03 原型链污染</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// foo是一个简单的JavaScript对象</span></span><br><span class="line"><span class="keyword">let</span> foo = {<span class="attr">bar</span>: <span class="number">1</span>}</span><br><span class="line"></span><br><span class="line"><span class="comment">// foo.bar 此时为1</span></span><br><span class="line"><span class="built_in">console</span>.log(foo.bar)</span><br><span class="line"></span><br><span class="line"><span class="comment">// 修改foo的原型（即Object）</span></span><br><span class="line">foo.__proto__.bar = <span class="number">2</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 由于查找顺序的原因，foo.bar仍然是1</span></span><br><span class="line"><span class="built_in">console</span>.log(foo.bar)</span><br><span class="line"></span><br><span class="line"><span class="comment">// 此时再用Object创建一个空的zoo对象</span></span><br><span class="line"><span class="keyword">let</span> zoo = {}</span><br><span class="line"></span><br><span class="line"><span class="comment">// 查看zoo.bar</span></span><br><span class="line"><span class="built_in">console</span>.log(zoo.bar)</span><br></pre></td></tr></table></figure>
<p>最后，虽然zoo是一个<strong>空</strong>对象<code>{}</code>，但<code>zoo.bar</code>的结果居然是2：</p>
<p><img src="/2021/04/10/%E6%B5%85%E8%B0%88nodejs%E5%8E%9F%E5%9E%8B%E9%93%BE%E6%B1%A1%E6%9F%93/image-20210410194707739.png" alt="image-20210410194707739"></p>
<p>原因也显而易见：因为前面我们修改了foo的原型<code>foo.__proto__.bar = 2</code>，而foo是一个Object类的实例，所以实际上是修改了Object这个类，给这个类增加了一个属性bar，值为2。</p>
<p>后来，我们又用Object类创建了一个zoo对象<code>let zoo = {}</code>，zoo对象自然也有一个bar属性了。</p>
<p>那么，在一个应用中，如果攻击者控制并修改了一个对象的原型，那么将可以影响所有和这个对象来自同一个类、父祖类的对象。这种攻击方式就是<strong>原型链污染</strong>。</p>
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<a class="article-title" href="/2021/03/16/VNCTF-realezjvav%E5%A4%8D%E7%8E%B0/">[VNCTF2021]realezjvav复现</a>
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<h1 id="算法学习之旅"><a href="#算法学习之旅" class="headerlink" title="算法学习之旅"></a>算法学习之旅</h1><h2 id="3-9算法分析学习"><a href="#3-9算法分析学习" class="headerlink" title="3.9算法分析学习"></a>3.9算法分析学习</h2><h3 id="欧几里得算法"><a href="#欧几里得算法" class="headerlink" title="欧几里得算法"></a>欧几里得算法</h3>
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<p>环境：CTFshow web4</p>
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<p>2、日志文件：本题中日志默认地址<code>/var/log/nginx/access.log</code></p>
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<h1 id="mysql数据库udf提权"><a href="#mysql数据库udf提权" class="headerlink" title="mysql数据库udf提权"></a>mysql数据库udf提权</h1><h2 id="mysql数据库udf提权步骤"><a href="#mysql数据库udf提权步骤" class="headerlink" title="mysql数据库udf提权步骤"></a>mysql数据库udf提权步骤</h2><p>UDF(user defined function)，即用户自定义函数。通过添加新函数，对MySQL数据库的功能进行扩充，就像使用本地MySQL函数如 database() 或 version() 一样。</p>
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<h1 id="SQL注入之万能密码"><a href="#SQL注入之万能密码" class="headerlink" title="SQL注入之万能密码"></a>SQL注入之万能密码</h1><p><code>' or 1='1</code></p>
<p>这是最简的万能密码了，今天记录一种看到的新的万能密码。</p>
<p>当or、and以及注释符号被严格过滤时，便可以选择这种万能密码</p>
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<h1 id="SQL注入绕过技巧"><a href="#SQL注入绕过技巧" class="headerlink" title="SQL注入绕过技巧"></a>SQL注入绕过技巧</h1><h2 id="0X01-绕过空格（注释符-a0）"><a href="#0X01-绕过空格（注释符-a0）" class="headerlink" title="0X01 绕过空格（注释符/**/,%a0）:"></a>0X01 绕过空格（注释符/**/,%a0）:</h2><p>两个空格代表一个空格，用tab代替空格，%a0=空格：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">%20 %09 %0a %0b %0c %0d %a0 %00 /**/ /*!*/</span><br></pre></td></tr></table></figure>
<p> 最基本的绕过方法，用注释替换空格：</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* 注释 */</span></span><br></pre></td></tr></table></figure>
<p><img src="/2021/01/07/SQL%E6%B3%A8%E5%85%A5%E7%BB%95%E8%BF%87%E6%8A%80%E5%B7%A7/1206476-20170728221518555-1717045547.png" alt="img"></p>
<p>使用浮点数：</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> * <span class="keyword">from</span> <span class="keyword">users</span> <span class="keyword">where</span> <span class="keyword">id</span>=<span class="number">8E0</span><span class="keyword">union</span> <span class="keyword">select</span> <span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span></span><br><span class="line"><span class="keyword">select</span> * <span class="keyword">from</span> <span class="keyword">users</span> <span class="keyword">where</span> <span class="keyword">id</span>=<span class="number">8.0</span> <span class="keyword">select</span> <span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span></span><br></pre></td></tr></table></figure>
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<p q-show="jsonFail" style="padding: 20px; font-size: 12px;">
缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
3、在根目录_config.yml里添加配置：
<pre style="font-size: 12px;" q-show="jsonFail">
jsonContent: