OSV-2020-1420 Bad-cast to Sass::PreValue from Sass::Unary_Expression
Not scored
Published
Check this codebase for OSV-2020-1420 and fix it if it is affected.
What it is: OSV-2020-1420 is a memory corruption vulnerability in libsass, published on 28 Jul 2020.
Exploitation: There is no known exploitation of OSV-2020-1420 in the wild and no public exploit code.
Affected packages and fixed versions:
- libsass (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-2020-1420/ (Markdown: https://insights.sbomify.com/OSV-2020-1420/index.md)
A bad-cast vulnerability in the Sass compiler library can cause a crash when parsing specific expressions, 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-2020-1420?
OSV-2020-1420 is a memory corruption vulnerability in libsass, published on 28 Jul 2020.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15896
Crash type: Bad-cast
Crash state:
Bad-cast to Sass::PreValue from Sass::Unary_Expression
Sass::SharedImpl<Sass::PreValue>::SharedImpl<Sass::Expression>
Sass::Parser::parse_ie_keyword_arg
Which versions are affected by OSV-2020-1420?
1 open source package ship an affected version, including libsass.
| Package | Affected | Fixed in |
|---|---|---|
libsass OSS-Fuzz | All versions | None |
How do I fix OSV-2020-1420?
No fix has been published for OSV-2020-1420 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-2020-1420 being exploited?
There is no known exploitation of OSV-2020-1420 in the wild and no public exploit code.