MEDIUM

GHSA-6w86-wgwq-rgq8

neqo-qpack has iInteger overflow in qpack dynamic table indexing

Details

### Summary

An unsanitized qpack index can lead to an integer overflow, panicing in debug mode, accessing the wrong or no dynamic table entry in release mode.

What does this mean for Firefox? Firefox runs Neqo in release mode. A malicious remote can cause its own QUIC connection to fail to use qpack, i.e. compression, or enter an inconsistent state. The remote can not crash Firefox, nor affect other QUIC connections.

### Details

See fuzz report in https://github.com/mozilla/neqo/issues/3406.

### PoC See test in pull request.

### Impact All Firefox users. Though vulnerability likely scoped to same connection, i.e. low impact.

Are you affected?

Enter the version of the package you're using.

Affected packages

crates.io/neqo-qpack

Introduced in: 0

No fixed version published yet for neqo-qpack. Pin to a known-safe version or switch to an alternative.

References

https://github.com/mozilla/neqo/security/advisories/GHSA-6w86-wgwq-rgq8[WEB]
https://github.com/mozilla/neqo/issues/3406[WEB]
https://github.com/mozilla/neqo[PACKAGE]