OSV-2021-525 Use-of-uninitialized-value in void edge_filtering_chroma_internal<unsigned char>
An attacker can cause a denial of service via a use-of-uninitialized-value bug in the AV1 video codec's chroma edge filtering.
- 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-2021-525?
OSV-2021-525 is an use after free vulnerability in kimageformats, published on 16 Mar 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=32059
Crash type: Use-of-uninitialized-value
Crash state:
void edge_filtering_chroma_internal<unsigned char>
edge_filtering_chroma
thread_task_deblock_CTBRow::work
Which versions are affected by OSV-2021-525?
1 open source package ship an affected version, including kimageformats.
| Package | Affected | Fixed in |
|---|---|---|
kimageformats OSS-Fuzz | All versions | None |
How do I fix OSV-2021-525?
No fix has been published for OSV-2021-525 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-2021-525 being exploited?
There is no known exploitation of OSV-2021-525 in the wild and no public exploit code.