OSV-2021-931 Heap-buffer-overflow in extract_name
Not scored
Published
Check this codebase for OSV-2021-931 and fix it if it is affected.
What it is: OSV-2021-931 is a memory corruption vulnerability in dnsmasq, published on 8 Jul 2021.
Exploitation: There is no known exploitation of OSV-2021-931 in the wild and no public exploit code.
Affected packages and fixed versions:
- dnsmasq (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-2021-931/ (Markdown: https://insights.sbomify.com/OSV-2021-931/index.md)
A heap buffer overflow in the extract_name function allows attackers to cause crashes or potentially execute arbitrary code via crafted DNS responses.
- Exploited in the wild
- Not known
- Login needed
- Not stated
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2021-931?
OSV-2021-931 is a memory corruption vulnerability in dnsmasq, published on 8 Jul 2021.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35861
Crash type: Heap-buffer-overflow WRITE 1
Crash state:
extract_name
answer_auth
FuzzAuth
Which versions are affected by OSV-2021-931?
1 open source package ship an affected version, including dnsmasq.
| Package | Affected | Fixed in |
|---|---|---|
dnsmasq OSS-Fuzz | All versions | None |
How do I fix OSV-2021-931?
No fix has been published for OSV-2021-931 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-2021-931 being exploited?
There is no known exploitation of OSV-2021-931 in the wild and no public exploit code.