Amazon Linux 2 Security Advisory: ALASECS-2023-018
Advisory Release Date: 2023-10-31 00:17 Pacific
Advisory Updated Date: 2025-03-13 01:33 Pacific
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. (CVE-2023-29409)
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023. (CVE-2023-39325)
Affected Packages:
runc
Note:
This advisory is applicable to Amazon Linux 2 - Ecs Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update runc to update your system.
aarch64:
runc-1.1.7-4.amzn2.aarch64
runc-debuginfo-1.1.7-4.amzn2.aarch64
src:
runc-1.1.7-4.amzn2.src
x86_64:
runc-1.1.7-4.amzn2.x86_64
runc-debuginfo-1.1.7-4.amzn2.x86_64
2025-03-13: CVE-2023-29409 was added to this advisory.