OSV-2020-480 Use-of-uninitialized-value in _idn2_punycode_decode
Not scored
Published
Check this codebase for OSV-2020-480 and fix it if it is affected.
What it is: OSV-2020-480 is a vulnerability in libidn2, published on 1 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of OSV-2020-480 in the wild and no public exploit code.
Affected packages and fixed versions:
- libidn2 (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-2020-480/ (Markdown: https://insights.sbomify.com/OSV-2020-480/index.md)
An attacker can cause a denial of service in applications using the IDN2 library by triggering a use-of-uninitialized-value bug during punycode decoding.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2020-480?
OSV-2020-480 is a vulnerability in libidn2, published on 1 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13359
Crash type: Use-of-uninitialized-value
Crash state:
_idn2_punycode_decode
_tr46
idn2_lookup_u8
Which versions are affected by OSV-2020-480?
1 open source package ship an affected version, including libidn2.
| Package | Affected | Fixed in |
|---|---|---|
libidn2 OSS-Fuzz | All versions | None |
How do I fix OSV-2020-480?
No fix has been published for OSV-2020-480 yet. Limit exposure of the affected software until one is available.
Is OSV-2020-480 being exploited?
There is no known exploitation of OSV-2020-480 in the wild and no public exploit code.