OSV-2021-939 Segv on unknown address in helper_uc_tracecode
Not scored
Published
Check this codebase for OSV-2021-939 and fix it if it is affected.
What it is: OSV-2021-939 is a memory corruption vulnerability in unicorn, published on 9 Jul 2021.
Exploitation: There is no known exploitation of OSV-2021-939 in the wild and no public exploit code.
Affected packages and fixed versions:
- unicorn (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-2021-939/ (Markdown: https://insights.sbomify.com/OSV-2021-939/index.md)
A segmentation fault in the Unicorn Engine's tracecode helper can cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not stated
- Attackable
- Not stated
- Victim action needed
- Not stated
- Fix
- None listed
What is OSV-2021-939?
OSV-2021-939 is a memory corruption vulnerability in unicorn, published on 9 Jul 2021.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35912
Crash type: Segv on unknown address
Crash state:
helper_uc_tracecode
Which versions are affected by OSV-2021-939?
1 open source package ship an affected version, including unicorn.
| Package | Affected | Fixed in |
|---|---|---|
unicorn OSS-Fuzz | All versions | None |
How do I fix OSV-2021-939?
No fix has been published for OSV-2021-939 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-2021-939 being exploited?
There is no known exploitation of OSV-2021-939 in the wild and no public exploit code.