CVE-2023-42118

Exim libspf2 Integer Underflow Remote Code Execution Vulnerability. This
vulnerability allows network-adjacent attackers to execute arbitrary code
on affected installations of Exim libspf2. Authentication is not required
to exploit this vulnerability. The specific flaw exists within the parsing
of SPF macros. When parsing SPF macros, the process does not properly
validate user-supplied data, which can result in an integer underflow
before writing to memory. An attacker can leverage this vulnerability to
execute code in the context of the service account. Was ZDI-CAN-17578.

Bugs

• <https://github.com/shevek/libspf2/issues/45&gt;
• <https://bugs.exim.org/show_bug.cgi?id=3032&gt;

Notes