CVE-2023-50186

What it actually does

Stack-based buffer overflow in AV1 metadata parsing within GStreamer due to missing length validation before copying attacker-controlled data into a fixed-size stack buffer, enabling arbitrary code execution in the context of the parsing process.

Why it matters to the business

Successful exploitation can allow remote attackers to compromise systems that process AV1 video content, resulting in full control of media playback or transcoding applications and potential lateral movement within media-heavy environments.

How an attack unfolds

An attacker creates a malformed AV1 video containing oversized metadata, delivers the file through common channels such as web downloads or email attachments, and relies on the victim application to invoke GStreamer parsing, which triggers the overflow and executes attacker-supplied code.

How to fix it

Upgrade GStreamer to the commit 4af14db10e8355f980bbf79733af004e59d255fc or later; rebuild and redeploy any applications statically or dynamically linked against the vulnerable library.

How to confirm the fix worked

Confirm the installed GStreamer source matches or exceeds commit 4af14db10e8355f980bbf79733af004e59d255fc; recompile and test parsing of known malformed AV1 samples to verify absence of crashes or memory corruption.

Typical attack path

1. Craft malicious AV1 video file embedding oversized metadata
2. Deliver the file to the target via web, email, or removable media
3. Victim application loads and parses the AV1 stream using GStreamer
4. Insufficient bounds check allows overflow of stack buffer
5. Attacker-controlled data overwrites return address or function pointers
6. Arbitrary code executes in the context of the GStreamer process

How to detect it

Monitor for GStreamer process crashes or segmentation faults while parsing AV1 content; review application logs for unexpected termination during metadata extraction; inspect for anomalous child processes spawned from media-handling binaries.

What your security team should do

• Immediately update all GStreamer installations to the fixed commit
• Inventory and replace any downstream media-processing pipelines that depend on vulnerable GStreamer versions
• Implement application sandboxing or containerization for video-handling services
• Add AV1 file handling to the list of monitored high-risk operations in endpoint detection rules