Large RSA keys can cause high CPU usage in crypto/tls
Summary
Large RSA keys can cause high CPU usage in crypto/tls
Original description
The description as published by the source.
Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2023-29409 golang-1.15
References
- advisory go.dev
- advisory groups.google.com
- advisory pkg.go.dev
- patch go.dev
- web security.gentoo.org
- web security.netapp.com
- web nvd.nist.gov