Public on 2023-08-02
Modified on 2024-01-20
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.
Medium severity
CVSS v3 Base Score
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2 - Core amazon-cloudwatch-agent 2023-08-17 ALAS2-2023-2209 Fixed
Amazon Linux 2023 amazon-cloudwatch-agent 2023-08-17 ALAS2023-2023-307 Fixed
Amazon Linux 2023 amazon-ecr-credential-helper 2023-09-14 ALAS2023-2023-346 Fixed
Amazon Linux 2 - Core amazon-ssm-agent 2023-10-12 ALAS2-2023-2303 Fixed
Amazon Linux 2023 amazon-ssm-agent 2023-09-27 ALAS2023-2023-373 Fixed
Amazon Linux 2 - Core cni-plugins 2023-08-17 ALAS2-2023-2208 Fixed
Amazon Linux 2023 cni-plugins 2023-08-31 ALAS2023-2023-338 Fixed
Amazon Linux 1 containerd 2023-09-27 ALAS-2023-1849 Fixed
Amazon Linux 2 - Docker Extra containerd 2023-08-17 ALAS2DOCKER-2023-027 Fixed
Amazon Linux 2 - Ecs Extra containerd 2023-09-27 ALAS2ECS-2023-008 Fixed
Amazon Linux 2 - Aws-nitro-enclaves-cli Extra containerd 2023-08-17 ALAS2NITRO-ENCLAVES-2023-028 Fixed
Amazon Linux 2023 containerd 2023-08-17 ALAS2023-2023-308 Fixed
Amazon Linux 2 - Core cri-tools 2023-08-31 ALAS2-2023-2229 Fixed
Amazon Linux 2023 docker 2023-09-14 ALAS2023-2023-345 Fixed
Amazon Linux 2023 ecs-init Pending Fix
Amazon Linux 1 golang 2023-09-27 ALAS-2023-1848 Fixed
Amazon Linux 2 - Core golang 2023-08-17 ALAS2-2023-2211 Fixed
Amazon Linux 2023 golang 2023-08-17 ALAS2023-2023-310 Fixed
Amazon Linux 2 - Core nerdctl 2023-08-17 ALAS2-2023-2210 Fixed
Amazon Linux 2023 nerdctl 2023-08-17 ALAS2023-2023-309 Fixed
Amazon Linux 2 - Docker Extra runc 2023-08-17 ALAS2DOCKER-2023-026 Fixed
Amazon Linux 2 - Aws-nitro-enclaves-cli Extra runc 2023-08-17 ALAS2NITRO-ENCLAVES-2023-027 Fixed

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L