USN-6455-1: Exim vulnerabilities

Releases

• Ubuntu 23.10
• Ubuntu 23.04
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• 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)

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

• exim4-daemon-heavy - 4.95-4ubuntu2.4
• exim4-daemon-light - 4.95-4ubuntu2.4

Ubuntu 20.04

• exim4-daemon-heavy - 4.93-13ubuntu1.9
• exim4-daemon-light - 4.93-13ubuntu1.9

Ubuntu 18.04

• exim4-daemon-heavy - 4.90.1-1ubuntu1.10+esm2
  Available with Ubuntu Pro
• exim4-daemon-light - 4.90.1-1ubuntu1.10+esm2
  Available with Ubuntu Pro

Ubuntu 16.04

• exim4-daemon-heavy - 4.86.2-2ubuntu2.6+esm5
  Available with Ubuntu Pro
• exim4-daemon-light - 4.86.2-2ubuntu2.6+esm5
  Available with Ubuntu Pro

Ubuntu 14.04

• exim4-daemon-heavy - 4.82-3ubuntu2.4+esm7
  Available with Ubuntu Pro
• exim4-daemon-light - 4.82-3ubuntu2.4+esm7
  Available with Ubuntu Pro

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

References

• CVE-2023-42117
• CVE-2023-42119