Submit #919147: Athlon1600 youtube-downloader 6c117f09 (master, 2026-06-02) SSRF (Server-Side Request Forgery)

DESCRIPTION TEXT (paste into Description field):

A vulnerability has been found in the php package "athlon1600/youtube-downloader"
and classified as high. Affected is the function stream of the file
public/stream.php and src/YouTubeStreamer.php. The manipulation of the argument
url leads to a server-side request forgery (SSRF). The endpoint is
unauthenticated. The application fetches any http:// or https:// URL supplied
via the "url" query parameter using cURL without any allow-list validation (no
restriction to the intended googlevideo.com CDN host). Loopback addresses
(127.0.0.1), RFC1918 private ranges, and cloud metadata endpoints
(x.x.x.x) can therefore be read by a remote attacker. cURL SSL
peer/host verification is disabled, and the full upstream response body
together with content-type/content-length/content-range headers is forwarded
back to the attacker, resulting in full read-back of internal services.

Exploitation was confirmed empirically in a local, isolated environment: the
unmodified library class was used to request an internal endpoint
(http://127.0.0.1:8899/internal-secret); the internal HTTP 200 response, its
Content-Type header, and the JSON body were returned verbatim to the caller.

Entry point: GET /public/stream.php?url=http%3A%2F%2F127.0.0.1%3A8899%2Finternal-secret

It is recommended to restrict the accepted URL to the YouTube CDN host (e.g.
^https://[\w.-]*\.googlevideo\.com/) and/or add a loopback/private-IP
blocklist with DNS-rebinding-safe resolution before performing the cURL request.

• Quelle: ⚠️ https://gist.github.com/qianqiusujiu/87a7d7d8bd7fb53cf8529e0bafbeafba
• Benutzer: qianqiu (UID 71960)
• Einreichung: 08.08.2026 06:42 (vor 2 Monaten)
• Moderieren: 27.09.2026 10:49 (2 months later)
• Status: Akzeptiert
• VulDB Eintrag: 410851 [athlon1600 youtube-downloader bis 4.0.1 public/stream.php stream url erweiterte Rechte]
• Punkte: 20