OSV-2021-736 Stack-use-after-return in zend_fiber_suspend_context
Not scored
Published
Check this codebase for OSV-2021-736 and fix it if it is affected.
What it is: OSV-2021-736 is an use after free vulnerability in php, published on 8 May 2021.
Exploitation: There is no known exploitation of OSV-2021-736 in the wild and no public exploit code.
Affected packages and fixed versions:
- php (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-2021-736/ (Markdown: https://insights.sbomify.com/OSV-2021-736/index.md)
A stack-use-after-return vulnerability in PHP's fiber suspension mechanism can cause a crash, potentially leading to 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-2021-736?
OSV-2021-736 is an use after free vulnerability in php, published on 8 May 2021.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34013
Crash type: Stack-use-after-return READ 4
Crash state:
zend_fiber_suspend_context
zend_fiber_suspend
zim_Fiber_suspend
Which versions are affected by OSV-2021-736?
1 open source package ship an affected version, including php.
| Package | Affected | Fixed in |
|---|---|---|
php OSS-Fuzz | All versions | None |
How do I fix OSV-2021-736?
No fix has been published for OSV-2021-736 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-2021-736 being exploited?
There is no known exploitation of OSV-2021-736 in the wild and no public exploit code.