Ubuntu Security Notices
USN-6881-1

USN-6881-1: Exim vulnerability

Publication date

8 July 2024

Overview

Exim could be made to allow response injection if it received a specially crafted response.

Releases

20.04 LTS 18.04 LTS 16.04 LTS 14.04 LTS

Packages

exim4 - Exim is a mail transport agent

Details

It was discovered that Exim did not enforce STARTTLS sync point on client
side. An attacker could possibly use this issue to perform response
injection during MTA SMTP sending.

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
20.04 focal	exim4 – 4.93-13ubuntu1.11
	exim4-base – 4.93-13ubuntu1.11
	eximon4 – 4.93-13ubuntu1.11
18.04 bionic	exim4 – 4.90.1-1ubuntu1.10+esm4
	exim4-base – 4.90.1-1ubuntu1.10+esm4
	eximon4 – 4.90.1-1ubuntu1.10+esm4
16.04 xenial	exim4 – 4.86.2-2ubuntu2.6+esm7
	exim4-base – 4.86.2-2ubuntu2.6+esm7
	eximon4 – 4.86.2-2ubuntu2.6+esm7
14.04 trusty	exim4 – 4.82-3ubuntu2.4+esm8
	exim4-base – 4.82-3ubuntu2.4+esm8
	eximon4 – 4.82-3ubuntu2.4+esm8

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References

CVE-2021-38371

CVE-2021-38371