OSV-2021-204 Heap-buffer-overflow in WelsDec::NeedErrorCon
A heap buffer overflow in the OpenH264 decoder allows attackers to cause denial of service or potentially execute code via crafted video files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2021-204?
OSV-2021-204 is a memory corruption vulnerability in openh264, published on 16 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29604
Crash type: Heap-buffer-overflow READ 1
Crash state:
WelsDec::NeedErrorCon
WelsDec::CheckAndFinishLastPic
WelsDecodeBs
Which versions are affected by OSV-2021-204?
1 open source package ship an affected version, including openh264.
| Package | Affected | Fixed in |
|---|---|---|
openh264 OSS-Fuzz | All versions | None |
How do I fix OSV-2021-204?
No fix has been published for OSV-2021-204 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is OSV-2021-204 being exploited?
There is no known exploitation of OSV-2021-204 in the wild and no public exploit code.