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<h1 id="1-ja3指纹"><a href="#1-ja3指纹" class="headerlink" title="1-ja3指纹"></a>1-<code>ja3</code>指纹</h1><p> 应该就是开始的<code>TLS</code>客户端握手过程的<code>Client Hello</code>,参考如下示例，来自<a target="_blank" rel="noopener" href="https://lwthiker.com/reversing/2022/02/20/impersonating-chrome-too.html">伪装chrome指纹(英文)</a></p>
<p>查看方式如下：</p>
<figure class="highlight cmd"><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></pre></td><td class="code"><pre><span class="line">#wireshark</span><br><span class="line">tls.handshake.<span class="built_in">type</span> == <span class="number">1</span></span><br><span class="line"></span><br><span class="line">#含义</span><br><span class="line"><span class="number">1</span> = Client Hello</span><br><span class="line"><span class="number">2</span> = Server Hello</span><br></pre></td></tr></table></figure>
<p>在 <strong>Client Hello 里看到的 <code>SNI=xxx</code>，SNI = 你“要访问的域名”</strong></p>
<p> 注意：<code>wireshark-3.6.x</code>以上才能直接看<code>JA3</code>的值</p>
<figure class="highlight plaintext"><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><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">Handshake Protocol: Client Hello</span><br><span class="line"> Handshake Type: Client Hello (1)</span><br><span class="line"> Length: 508</span><br><span class="line"> Version: TLS 1.2 (0x0303)</span><br><span class="line"> Random: b46aad...</span><br><span class="line"> Session ID Length: 32</span><br><span class="line"> Session ID: 74c03b...</span><br><span class="line"> Cipher Suites Length: 32</span><br><span class="line"> Cipher Suites (16 suites)</span><br><span class="line"> Compression Methods Length: 1</span><br><span class="line"> Compression Methods (1 method)</span><br><span class="line"> Extensions Length: 403</span><br><span class="line"> Extension: Reserved (GREASE) (len=0)</span><br><span class="line"> Extension: server_name (len=17)</span><br><span class="line"> Extension: extended_master_secret (len=0)</span><br><span class="line"> Extension: renegotiation_info (len=1)</span><br><span class="line"> Extension: supported_groups (len=10)</span><br><span class="line"> Extension: ec_point_formats (len=2)</span><br><span class="line"> Extension: session_ticket (len=0)</span><br><span class="line"> Extension: application_layer_protocol_negotiation (len=14)</span><br><span class="line"> Extension: status_request (len=5)</span><br><span class="line"> Extension: signature_algorithms (len=18)</span><br><span class="line"> Extension: signed_certificate_timestamp (len=0)</span><br><span class="line"> Extension: key_share (len=43)</span><br><span class="line"> Extension: psk_key_exchange_modes (len=2)</span><br><span class="line"> Extension: supported_versions (len=7)</span><br><span class="line"> Extension: compress_certificate (len=3)</span><br><span class="line"> Extension: application_settings (len=5)</span><br><span class="line"> Extension: Reserved (GREASE) (len=1)</span><br><span class="line"> Extension: padding (len=203)</span><br></pre></td></tr></table></figure>
<p><img src="https://raw.githubusercontent.com/cliayn/blog-images/main/blog-images/image-20260530205233370.png" alt="ja3最直观查看"></p>
<h3 id="ja3和ja4的区别"><a href="#ja3和ja4的区别" class="headerlink" title="ja3和ja4的区别"></a>ja3和ja4的区别</h3><p><strong>JA3 vs JA4</strong></p>
<ul>
<li><p><strong>JA3</strong>：只用 ClientHello 的基本字段生成 MD5</p>
</li>
<li><p>JA4</p>
<p>：JA3 扩展版，考虑：</p>
<ul>
<li>TLS 扩展顺序</li>
<li>QUIC / HTTP2</li>
<li>Application Layer Protocol（ALPN）</li>
</ul>
</li>
<li><p>都是 <strong>ClientHello 的序列化内容</strong> → 哈希 → JA3/JA4</p>
</li>
</ul>
<p><img src="https://raw.githubusercontent.com/cliayn/blog-images/main/blog-images/image-20260531143352976.png" alt="JA3 vs JA4"></p>
<h1 id="2-指纹特征"><a href="#2-指纹特征" class="headerlink" title="2-指纹特征"></a>2-指纹特征</h1><p>待续。。。</p>
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<p> 参考：<a target="_blank" rel="noopener" href="https://www.freebuf.com/articles/others-articles/210289.html">PC微信逆向：发送与接收消息的分析与代码实现 - FreeBuf网络安全行业门户</a></p>
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<h1 id="0-前言"><a href="#0-前言" class="headerlink" title="0-前言"></a>0-前言</h1><p><a target="_blank" rel="noopener" href="https://cliayn.github.io/webrtc/">内网直传 · 专业修复版(点击体验)</a></p>
<p><code>WebRTC</code>与<code>p2p</code>连通条件相似，但是因为浏览器处于沙箱环境，没有原生代码能直接固定内网原端口，无视安全风险的能力和相关权限，所以如果除去中继服务器的话，<code>nat4</code>的连接会很不稳定</p>
<p> <strong>全锥型 vs 对称型</strong>：不需要预测，基本能秒连。</p>
<p> <strong>受限型 vs 对称型</strong>：需要预测（或者叫端口试探）。</p>
<p> <strong>对称型 vs 对称型</strong>：预测基本没戏，一般只能走 TURN。</p>
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<h1 id="0-前言"><a href="#0-前言" class="headerlink" title="0-前言"></a>0-前言</h1><p> 针对<code>web</code>前端的<code>js</code>的绕过登录、赋值、反调试、混淆对抗以及加解密签名的一些记录心得，<code>js</code>的逆向存在和安卓逆向相似的部分例如：调用栈<code>trace</code>和动态的“指针”<code>this</code>记录在末尾；</p>
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<p><code>NexT version 8.21.1</code></p>
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<h1 id="0-前言"><a href="#0-前言" class="headerlink" title="0-前言"></a>0-前言</h1><p> 记录<code>fastjson</code>的漏洞的测试心得,更为详细的可以参考大佬的安全笔记<a target="_blank" rel="noopener" href="https://github.com/javaweb-sec/javaweb-sec">Java Web安全</a></p>
<p><strong>第一步看报错类型。</strong></p>
<p>构建报错类查看报错：<code>{@type:xxx.class,val:xxx.String}</code>等<code>json</code>;<br>如果是 <code>type not match</code>，通常是顶层类型和接口期望类型不一致；如果是 <code>autoType is not support</code>，说明已经进了 Fastjson 的类型安全检查；如果返回的是业务提示，比如“请输入id”，说明对象已经成功落到业务层。这个区分对定位问题非常关键。你前面的日志已经足够证明：业务类可反序列化，危险类被拦截。</p>
<p><strong>第二步看版本与配置。</strong><br> 优先从代码依赖、jar 文件名、启动参数、<code>fastjson.properties</code>、异常堆栈里确认版本和是否启用了 <code>safeMode</code>。Fastjson 官方文档明确给了三种开启 safeMode 的方式，且 safeMode 打开后会完全禁用 autoType。Fastjson 2.x 则是默认禁用 autoType、以更安全的方式设计。</p>
<p><strong>第三步看“是否存在 AutoType”。</strong><br> 不是只看能不能写 <code>@type</code>，而是看它能不能把类型落到你控制的类上。你这里 <code>GetxxxParam</code> 能进业务层，说明接口的对象绑定链路存在；但 <code>BasicDataSource</code> 被拒，说明高危类型没过安全门槛。</p>
<p><strong>第四步看是否“可绕过”。</strong><br> 可以直接按版本和官方公告判断：1.2.83 之前存在被修复的绕过问题，1.2.68 起有 safeMode；如果目标已经开了 safeMode，autoType 会被完全关闭。</p>
<p><strong>第五步，不能绕过时就做业务类审计。</strong><br>没有历史漏洞则真正能做的部分：反编译 <code>GetxxxParam</code>(对应的业务类)，看 setter、构造函数、字段类型、后续 controller/service 是否会继续调用它的方法。<code>Fastjson</code> 官方也提供了 <code>AutoTypeCheckHandler</code> 这类扩展点，说明很多场景最终要回到应用自己的类型与业务逻辑上看。</p>
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