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Ubuntu 20.04: USN-6881-1 Critical Exim Response Injection Threat

ubuntu
Calendar Grey July 10, 2024
Dist Ubuntu Esm H88
Exim has implemented a security patch addressing a response injection vulnerability that impacts various versions of Ubuntu. Discover additional details here.
Exim could be made to allow response injection if it received a specially crafted response.

Summary

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

crafted response.

Software Description:

- 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.

Topics%20covered

Topics Covered

security advisory security update critical exim ubuntu mail transport agent response injection

Update Instructions

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

Ubuntu 20.04 LTS
   exim4                           4.93-13ubuntu1.11
   exim4-base                      4.93-13ubuntu1.11
   eximon4  4.93-13ubuntu1.11

Ubuntu 18.04 LTS
   exim4                           4.90.1-1ubuntu1.10+esm4
                                   Available with Ubuntu Pro
   exim4-base                      4.90.1-1ubuntu1.10+esm4
                                   Available with Ubuntu Pro
   eximon4                         4.90.1-1ubuntu1.10+esm4
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   exim4                           4.86.2-2ubuntu2.6+esm7
                                   Available with Ubuntu Pro
   exim4-base                      4.86.2-2ubuntu2.6+esm7
                                   Available with Ubuntu Pro
   eximon4                         4.86.2-2ubuntu2.6+esm7
                                   Available with Ubuntu Pro

Ubuntu 14.04 LTS
   exim4                           4.82-3ubuntu2.4+esm8
                                   Available with Ubuntu Pro
   exim4-base                      4.82-3ubuntu2.4+esm8
                                   Available with Ubuntu Pro
   eximon4                         4.82-3ubuntu2.4+esm8
                                   Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-6881-1

  CVE-2021-38371

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6881-1

Topics%20covered

Topics Covered

security advisory security update critical exim ubuntu mail transport agent response injection

Package Information

https://launchpad.net/ubuntu/+source/exim4/4.93-13ubuntu1.11

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