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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

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 23.04 - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS (Available with Ubuntu Pro) - Ubuntu 16.04 LTS (Available with Ubuntu Pro) - Ubuntu 14.04 LTS (Available with Ubuntu Pro) 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 ...

Read the Full Advisory

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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