OSV-2021-924 Heap-buffer-overflow in check_bad_address
Not scored
Published
Check this codebase for OSV-2021-924 and fix it if it is affected.
What it is: OSV-2021-924 is a memory corruption vulnerability in dnsmasq, published on 8 Jul 2021.
Exploitation: There is no known exploitation of OSV-2021-924 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-2021-924/ (Markdown: https://insights.sbomify.com/OSV-2021-924/index.md)
A heap-buffer-overflow in check_bad_address allows attackers to cause memory corruption, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2021-924?
OSV-2021-924 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=35868
Crash type: Heap-buffer-overflow WRITE 1
Crash state:
check_bad_address
check_for_bogus_wildcard
FuzzCheckForBogusWildcard
Which versions are affected by OSV-2021-924?
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-2021-924?
No fix has been published for OSV-2021-924 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-2021-924 being exploited?
There is no known exploitation of OSV-2021-924 in the wild and no public exploit code.