exim4 regression

USN-6455-1 fixed vulnerabilities in Exim. The fix for CVE-2023-42117
introduced a regression on Ubuntu 22.04 LTS that resulted in certain
connections logging a Taint mismatch error. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Exim incorrectly handled validation of user-supplied
data, which could lead to memory corruption. A remote attacker could
possibly use this issue to execute arbitrary code. (CVE-2023-42117)

It was discovered that Exim incorrectly handled validation of user-supplied
data, which could lead to an out-of-bounds read. An attacker could possibly
use this issue to expose sensitive information. (CVE-2023-42119)