Exim 4 prior to 4.94.2 allows Exposure of File Descriptor to Unintended Control Sphere because rda_interpret uses a privileged pipe that lacks a close-on-exec flag.
The Qualys Research Labs reported several vulnerabilities in Exim, a
mail transport agent, which could result in local privilege escalation
and remote code execution
Details can be found in the Qualys advisory at
wwwqualyscom/2021/05/04/21nails/21nailstxt
For the stable distribution (buster), these problems have been fixed in
version 4 ...
Exim 4 before 4942 allows Execution with Unnecessary Privileges Because Exim operates as root in the log directory (owned by a non-root user), a symlink or hard link attack allows overwriting critical root-owned files anywhere on the filesystem (CVE-2020-28007)
Exim 4 before 4942 allows Execution with Unnecessary Privileges Because Exim oper ...
Vulmon