OSV-2020-261 Use-of-uninitialized-value in WelsDec::CWelsDecoder::ReleaseBufferedReadyPicture
An attacker can cause a denial of service in the OpenH264 decoder by triggering a use-of-uninitialized-value error during picture release.
- 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-2020-261?
OSV-2020-261 is an use after free vulnerability in openh264, published on 30 Jun 2020. 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=18744
Crash type: Use-of-uninitialized-value
Crash state:
WelsDec::CWelsDecoder::ReleaseBufferedReadyPicture
WelsDec::CWelsDecoder::ReorderPicturesInDisplay
WelsDec::CWelsDecoder::DecodeFrame2WithCtx
Which versions are affected by OSV-2020-261?
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-2020-261?
No fix has been published for OSV-2020-261 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is OSV-2020-261 being exploited?
There is no known exploitation of OSV-2020-261 in the wild and no public exploit code.