Exim: Heap-based buffer overflow — GLSA 202003-47

A vulnerability in Exim could allow a remote attacker to execute arbitrary code.

Affected packages

Package	mail-mta/exim on all architectures
Affected versions	< 4.92.3
Unaffected versions	>= 4.92.3

Background

Exim is a message transfer agent (MTA) designed to be a a highly configurable, drop-in replacement for sendmail.

Description

It was discovered that Exim incorrectly handled certain string operations.

Impact

A remote attacker, able to connect to a vulnerable Exim instance, could possibly execute arbitrary code with the privileges of the process or cause a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All Exim users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=mail-mta/exim-4.92.3"

References

CVE-2019-16928

Release date
March 20, 2020

Latest revision
March 20, 2020: 1

Severity
high

Exploitable
remote

Bugzilla entries

701282