Ubuntu 23.10: USN-6455-1 Critical Exim Memory Corruption Issues

ubuntu

October 30, 2023

Several security issues were fixed in Exim.

Summary

Several security issues were fixed in Exim.

Software Description:

- exim4: Exim is a mail transport agent

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)

Topics Covered

security advisory remote code execution exim memory corruption Ubuntu

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.10:
   exim4-daemon-heavy              4.96-17ubuntu2.1
   exim4-daemon-light              4.96-17ubuntu2.1

Ubuntu 23.04:
   exim4-daemon-heavy              4.96-14ubuntu1.3
   exim4-daemon-light              4.96-14ubuntu1.3

Ubuntu 22.04 LTS:
   exim4-daemon-heavy              4.95-4ubuntu2.4
   exim4-daemon-light              4.95-4ubuntu2.4

Ubuntu 20.04 LTS:
   exim4-daemon-heavy              4.93-13ubuntu1.9
   exim4-daemon-light              4.93-13ubuntu1.9

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   exim4-daemon-heavy              4.90.1-1ubuntu1.10+esm2
   exim4-daemon-light              4.90.1-1ubuntu1.10+esm2

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   exim4-daemon-heavy              4.86.2-2ubuntu2.6+esm5
   exim4-daemon-light              4.86.2-2ubuntu2.6+esm5

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   exim4-daemon-heavy              4.82-3ubuntu2.4+esm7
   exim4-daemon-light              4.82-3ubuntu2.4+esm7

In general, a standard system update will make all the necessary changes.