1. Ubuntu Security Notices
  2. USN-6411-1

USN-6411-1: Exim vulnerabilities

Publication date

4 October 2023

Overview

Several security issues were fixed in Exim.

Releases

Packages

  • exim4 - Exim is a mail transport agent

Details

It was discovered that Exim incorrectly handled certain challenge requests.
A remote attacker could possibly use this issue to perform out-of-bounds
reads, resulting in information leakage. (CVE-2023-42114)

It was discovered that Exim incorrectly handled validation of user-supplied
data. A remote attacker could possibly use this issue to perform
out-of-bounds writes, resulting in arbitrary code execution. This issue
only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 23.04.
(CVE-2023-42115)

It was discovered that Exim incorrectly handled certain challenge requests.
A remote attacker could possibly use this issue to perform out-of-bounds
writes, resulting in arbitrary code execution. (CVE-2023-42116)

It was discovered that Exim incorrectly handled certain challenge requests.
A remote attacker could possibly use this issue to perform out-of-bounds
reads, resulting in information leakage. (CVE-2023-42114)

It was discovered that Exim incorrectly handled validation of user-supplied
data. A remote attacker could possibly use this issue to perform
out-of-bounds writes, resulting in arbitrary code execution. This issue
only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 23.04.
(CVE-2023-42115)

It was discovered that Exim incorrectly handled certain challenge requests.
A remote attacker could possibly use this issue to perform out-of-bounds
writes, resulting in arbitrary code execution. (CVE-2023-42116)

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
23.04 lunar exim4 –  4.96-14ubuntu1.2
exim4-base –  4.96-14ubuntu1.2
exim4-daemon-heavy –  4.96-14ubuntu1.2
exim4-daemon-light –  4.96-14ubuntu1.2
eximon4 –  4.96-14ubuntu1.2
22.04 jammy exim4 –  4.95-4ubuntu2.3
exim4-base –  4.95-4ubuntu2.3
exim4-daemon-heavy –  4.95-4ubuntu2.3
exim4-daemon-light –  4.95-4ubuntu2.3
eximon4 –  4.95-4ubuntu2.3
20.04 focal exim4 –  4.93-13ubuntu1.8
exim4-base –  4.93-13ubuntu1.8
exim4-daemon-heavy –  4.93-13ubuntu1.8
exim4-daemon-light –  4.93-13ubuntu1.8
eximon4 –  4.93-13ubuntu1.8
18.04 bionic exim4 –  4.90.1-1ubuntu1.10+esm1  
exim4-base –  4.90.1-1ubuntu1.10+esm1  
exim4-daemon-heavy –  4.90.1-1ubuntu1.10+esm1  
exim4-daemon-light –  4.90.1-1ubuntu1.10+esm1  
eximon4 –  4.90.1-1ubuntu1.10+esm1  
16.04 xenial exim4 –  4.86.2-2ubuntu2.6+esm4  
exim4-base –  4.86.2-2ubuntu2.6+esm4  
exim4-daemon-heavy –  4.86.2-2ubuntu2.6+esm4  
exim4-daemon-light –  4.86.2-2ubuntu2.6+esm4  
eximon4 –  4.86.2-2ubuntu2.6+esm4  
14.04 trusty exim4 –  4.82-3ubuntu2.4+esm6  
exim4-base –  4.82-3ubuntu2.4+esm6  
exim4-daemon-heavy –  4.82-3ubuntu2.4+esm6  
exim4-daemon-light –  4.82-3ubuntu2.4+esm6  
eximon4 –  4.82-3ubuntu2.4+esm6  

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›