webpki: CPU denial of service in certificate path building
Details
Package
webpki
Version
0.21.4
Date
2023-08-22
Patched versions
>=0.22.2
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.
webpki0.21.4>=0.22.2When 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.
This was previously reported in <https://github.com/briansmith/webpki/issues/69> and re-reported recently by Luke Malinowski.
webpki 0.22.1 included a partial fix and webpki 0.22.2 added further fixes.
See advisory page for additional details.