OSV-2021-21 Segv on unknown address in frame_get_lazychunk
Not scored
Published
Check this codebase for OSV-2021-21 and fix it if it is affected.
What it is: OSV-2021-21 is a memory corruption vulnerability in c-blosc2, published on 7 Jan 2021.
Exploitation: There is no known exploitation of OSV-2021-21 in the wild and no public exploit code.
Affected packages and fixed versions:
- c-blosc2 (OSS-Fuzz): affected all versions; no fix listed
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/OSV-2021-21/ (Markdown: https://insights.sbomify.com/OSV-2021-21/index.md)
A segmentation fault in the Blosc2 library during chunk decompression can cause a denial of service when processing malformed data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2021-21?
OSV-2021-21 is a memory corruption vulnerability in c-blosc2, published on 7 Jan 2021.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29295
Crash type: Segv on unknown address
Crash state:
frame_get_lazychunk
frame_decompress_chunk
blosc2_schunk_decompress_chunk
Which versions are affected by OSV-2021-21?
1 open source package ship an affected version, including c-blosc2.
| Package | Affected | Fixed in |
|---|---|---|
c-blosc2 OSS-Fuzz | All versions | None |
How do I fix OSV-2021-21?
No fix has been published for OSV-2021-21 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-2021-21 being exploited?
There is no known exploitation of OSV-2021-21 in the wild and no public exploit code.