Headline
GHSA-fh2r-99q2-6mmg: rustls-webpki: CPU denial of service in certificate path building
When this crate is given a pathological certificate chain to validate, it will spend CPU time exponential with the number of candidate certificates at each step of path building.
Both TLS clients and TLS servers that accept client certificate are affected.
We now give each path building operation a budget of 100 signature verifications.
The original webpki crate is also affected.
This was previously reported in the original crate https://github.com/briansmith/webpki/issues/69 and re-reported to us recently.
- GitHub Advisory Database
- GitHub Reviewed
- GHSA-fh2r-99q2-6mmg
rustls-webpki: CPU denial of service in certificate path building
High severity GitHub Reviewed Published Aug 22, 2023 to the GitHub Advisory Database • Updated Aug 22, 2023
Package
cargo rustls-webpki (Rust)
Affected versions
< 0.100.2
>= 0.101.0, < 0.101.4
Patched versions
0.100.2
0.101.4
When this crate is given a pathological certificate chain to validate, it will spend CPU time exponential with the number of candidate certificates at each step of path building.
Both TLS clients and TLS servers that accept client certificate are affected.
We now give each path building operation a budget of 100 signature verifications.
The original webpki crate is also affected.
This was previously reported in the original crate briansmith/webpki#69 and re-reported to us recently.
References
- rustls/webpki@4ea0523
- rustls/webpki@dcad240
- https://rustsec.org/advisories/RUSTSEC-2023-0053.html
Published to the GitHub Advisory Database
Aug 22, 2023
Last updated
Aug 22, 2023