OSV-2020-2045 Use-of-uninitialized-value in WelsDec::GetColocatedMb
An attacker can cause a denial of service in the OpenH264 decoder by triggering a use-of-uninitialized-value error during video decoding.
- 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-2020-2045?
OSV-2020-2045 is an use after free vulnerability in openh264, published on 13 Oct 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=26272
Crash type: Use-of-uninitialized-value
Crash state:
WelsDec::GetColocatedMb
WelsDec::PredBDirectTemporal
WelsDec::WelsDecodeMbCavlcBSlice
Which versions are affected by OSV-2020-2045?
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-2020-2045?
No fix has been published for OSV-2020-2045 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-2020-2045 being exploited?
There is no known exploitation of OSV-2020-2045 in the wild and no public exploit code.