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CVE-2023-29409

5.3 · MEDIUM

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures.

Published Aug 2, 2023CWE-400EPSS 1.60%

Overview

CVE-2023-29409 is a medium-severity vulnerability. It was published on August 2, 2023 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgo.dev/cl/515257Refgo.dev/issue/61460Refgroups.google.com/g/golang-announce/c/X0b6CsSAaYI/m/Efv5DbZ9AwAJRefpkg.go.dev/vuln/GO-2023-1987Refsecurity.gentoo.org/glsa/202311-09Refsecurity.netapp.com/advisory/ntap-20230831-0010/Refgo.dev/cl/515257Refgo.dev/issue/61460Refgroups.google.com/g/golang-announce/c/X0b6CsSAaYI/m/Efv5DbZ9AwAJRefpkg.go.dev/vuln/GO-2023-1987

How CyberStrike helps

Frequently asked questions

What is CVE-2023-29409?

CVE-2023-29409 is a medium-severity vulnerability. It was published on August 2, 2023 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2023-29409?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-29409?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-29409?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-29409 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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