… to <= 8192 bits Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. Limit this by restricting the size of RSA keys transmitted during handshakes 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. Thanks to Mateusz Poliwczak for reporting this issue. Updates #61460 Fixes #61579 Fixes CVE-2023-29409 Change-Id: Ie35038515a649199a36a12fc2c5df3af855dca6c Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1912161 Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Tatiana Bradley <tatianabradley@google.com> Run-TryBot: Roland Shoemaker <bracewell@google.com> (cherry picked from commit d865c715d92887361e4bd5596e19e513f27781b7) Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1965487 Reviewed-on: https://go-review.googlesource.com/c/go/+/514915 Run-TryBot: David Chase <drchase@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Bypass: David Chase <drchase@google.com>

security: fix CVE-2023-29409 [1.19 backport] #61579

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gopherbot commented on Aug 1, 2023

gopherbot commented on Aug 1, 2023

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