OSV-2021-557 Heap-use-after-free in copy_string
Not scored
Published
Check this codebase for OSV-2021-557 and fix it if it is affected.
What it is: OSV-2021-557 is an use after free vulnerability in libarchive, published on 25 Mar 2021.
Exploitation: There is no known exploitation of OSV-2021-557 in the wild and no public exploit code.
Affected packages and fixed versions:
- libarchive (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-2021-557/ (Markdown: https://insights.sbomify.com/OSV-2021-557/index.md)
A heap-use-after-free vulnerability in copy_string allows attackers to potentially execute arbitrary code or cause 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-2021-557?
OSV-2021-557 is an use after free vulnerability in libarchive, published on 25 Mar 2021.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375
Crash type: Heap-use-after-free READ 1
Crash state:
copy_string
do_uncompress_block
process_block
Which versions are affected by OSV-2021-557?
1 open source package ship an affected version, including libarchive.
| Package | Affected | Fixed in |
|---|---|---|
libarchive OSS-Fuzz | All versions | None |
How do I fix OSV-2021-557?
No fix has been published for OSV-2021-557 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-2021-557 being exploited?
There is no known exploitation of OSV-2021-557 in the wild and no public exploit code.