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Ubuntu 23.04 LTS USN-6411-1 Critical Exim Remote Attack Issues

ubuntu
Calendar Grey October 4, 2023
Dist Ubuntu Esm H88
Tackling essential Exim vulnerabilities on Ubuntu platforms by deploying updates that safeguard against external threats.
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 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)

Topics%20covered

Topics Covered

security advisory information leak critical exim arbitrary code execution remote attack ubuntu

Update Instructions

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

Ubuntu 23.04:
   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

Ubuntu 22.04 LTS:
   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

Ubuntu 20.04 LTS:
   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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   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

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   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

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   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

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

References

https://ubuntu.com/security/notices/USN-6411-1

CVE-2023-42114, CVE-2023-42115, CVE-2023-42116

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6411-1

Topics%20covered

Topics Covered

security advisory information leak critical exim arbitrary code execution remote attack ubuntu

Package Information

https://launchpad.net/ubuntu/+source/exim4/4.96-14ubuntu1.2
https://launchpad.net/ubuntu/+source/exim4/4.95-4ubuntu2.3
https://launchpad.net/ubuntu/+source/exim4/4.93-13ubuntu1.8

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