GHSA-77vh-xpmg-72qh Clarify `mediaType` handling
Ambiguous OCI manifest and index documents can be misinterpreted, potentially leading to security bypasses or code execution during deserialization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-77vh-xpmg-72qh?
GHSA-77vh-xpmg-72qh is an unsafe deserialization vulnerability in github.com/opencontainers/image-spec, published on 18 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Impact
In the OCI Image Specification version 1.0.1 and prior, manifest and index documents are not self-describing and documents with a single digest could be interpreted as either a manifest or an index.
Patches
The Image Specification will be updated to recommend that both manifest and index documents contain a mediaType field to identify the type of document.
Release v1.0.2 includes these updates.
Workarounds
Software attempting to deserialize an ambiguous document may reject the document if it contains both “manifests” and “layers” fields or “manifests” and “config” fields.
References
https://github.com/opencontainers/distribution-spec/security/advisories/GHSA-mc8v-mgrf-8f4m
For more information
If you have any questions or comments about this advisory:
Which versions are affected by GHSA-77vh-xpmg-72qh?
2 open source packages ship an affected version, including github.com/opencontainers/image-spec.
| Package | Affected | Fixed in |
|---|---|---|
github.com/opencontainers/image-spec Go | All versions | 1.0.2 |
github.com/opencontainers/image-spec Go | All versions | 1.0.2 |
How do I fix GHSA-77vh-xpmg-72qh?
Upgrade github.com/opencontainers/image-spec to 1.0.2 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is GHSA-77vh-xpmg-72qh being exploited?
There is no known exploitation of GHSA-77vh-xpmg-72qh in the wild and no public exploit code.