Astra Linux – Vulnerability in Heimdal

The fix for CVE-2022-3437 involved changing the memcmp function to run in constant time, as well as providing a workaround for a compiler bug by adding comparisons of the result of memcmp with the value “!= 0”. When these patches were backported to the heimdal-7.7.1 and heimdal-7.8.0 branches and...

The fix for CVE-2022-3437 included changing memcmp to be constant time and a workaround for a compiler bug by adding "!= 0" comparisons to the result of memcmp. When these patches were backported to the heimdal-7.7.1 and heimdal-7.8.0 branches (and possibly other branches) a logic inversion sneaked in causing the validation of message integrity codes in gssapi/arcfour to be inverted.

...

PT-2022-6537 · Heimdal +4 · Heimdal +4

Name of the Vulnerable Software and Affected Versions: heimdal versions 7.7.1 through 7.8.0 Description: The issue is related to the implementation of the Kerberos5 protocol in heimdal, specifically concerning incorrect validation of message integrity codes. This can allow a remote attacker to...