Impact

This is a collision attack on long IDs (64bits) for PGP keys.

Users of dependency verification in Gradle are vulnerable if they use long IDs for PGP keys in a trusted-key or pgp element in their dependency verification metadata file.

Patches

The fix is to fail dependency verification if anything but a fingerprint is used in a trust element in dependency verification metadata.

The problem is fixed in Gradle 8.0 and above. The problem is also patched in Gradle 6.9.4 and 7.6.1.

Workarounds

Using only full fingerprint IDs for trusted-key or pgp element in the metadata is a protection against this issue.

References

• CWE-829: Inclusion of Functionality from Untrusted Control Sphere
• A Confusing Dependency
• Dependency Confusion

Questions?

• For security related issues, please email us at security@gradle.com.
• For non-security related issues, please open an issue on GitHub.