USN-6881-1: Exim vulnerability

8 July 2024

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

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Releases

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.

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.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

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

References

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Further reading