OSV-2020-2141 Use-of-uninitialized-value in WelsDec::WelsDeblockingMb
An attacker can cause a denial of service in the OpenH264 decoder by triggering a use-of-uninitialized-value error during video frame deblocking.
- 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-2020-2141?
OSV-2020-2141 is an use after free vulnerability in openh264, published on 9 Nov 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=27306
Crash type: Use-of-uninitialized-value
Crash state:
WelsDec::WelsDeblockingMb
WelsDec::WelsDeblockingFilterSlice
WelsDec::WelsTargetSliceConstruction
Which versions are affected by OSV-2020-2141?
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-2020-2141?
No fix has been published for OSV-2020-2141 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-2020-2141 being exploited?
There is no known exploitation of OSV-2020-2141 in the wild and no public exploit code.