CVE-2021-34558

MEDIUM severity · CVSS 6.5 · CWE-295

6.5CVSS MEDIUM

Summary

The crypto/tls package of Go through 1.16.5 does not properly assert that the type of public key in an X.509 certificate matches the expected type when doing a RSA based key exchange, allowing a malicious TLS server to cause a TLS client to panic.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionRequired

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)1%

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Additional information

NVD record
https://golang.org/doc/devel/release#go1.16.minorAdvisory
https://groups.google.com/g/golang-announceAdvisory
https://groups.google.com/g/golang-announce/c/n9FxMelZGAQAdvisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BA7MFVXRBEKRTLSLYDICTYCGEMK2HZ7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3XBQUFVI5TMV4KMKI7GKA223LHGPQISE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6BTC3JQUASFN5U2XA4UZIGAPZQBD5JSS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D7FRFM7WWR2JCT6NORQ7AO6B453OMI3I/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITRXPCHUCJGXCX2CUEPKZRRTB27GG4ZB/