Path building complexity is now limited to a maximum budget of path finding operations, avoiding exponential processing time when encountering certificate chains containing many certificates with the same subject/issuer distinguished name but different subject public key information.
Name constraints evaluation is now limited to a maximum number of comparison operations, avoiding exponential processing time when encountering certificate chains containing many name constraints and subject alternate names.
What's Changed
The following PRs were backported to the rel-0.100 branch in rustls/webpki#172
Thanks to all who have contributed, on behalf of the rustls team (@ctz, @cpu and @djc)!
v/0.100.2
Release notes
certificate path building and verification is now capped at 100 signature validation operations to avoid the risk of CPU usage denial-of-service attack when validating crafted certificate chains producing quadratic runtime. This risk affected both clients, as well as servers that verified client certificates.
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Bumps rustls-webpki from 0.100.1 to 0.100.3.
Release notes
Sourced from rustls-webpki's releases.
Commits
5649c6a
Cargo: bump version 0.100.2 -> 0.100.3.86f4cb2
verify_cert: use enum for build chain error50a2930
verify_cert: correct handling of fatal errors0651f72
error: add is_fatal helper, use in verify_cert0598dd2
verify_cert: optionalBudget
arg forverify_chain
helper277fb4b
verify_cert: take references in verify_chain helper63f78e0
verify_cert: name constraint checking on verified chainf55622a
verify_cert: budget for name constraint comparisons141ddcb
verify_cert: pull outverify_chain
test helpereb07f2f
verify_cert: pull outmake_end_entity
test helperDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
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