1. Ubuntu Security Notices
  2. USN-3493-1

USN-3493-1: Exim vulnerability

Publication date

27 November 2017

Overview

Exim could be made to crash or run programs if it received specially crafted network traffic.

Releases

Packages

  • exim4 - Exim is a mail transport agent

Details

It was discovered that Exim incorrectly handled memory in the ESMTP
CHUNKING extension. A remote attacker could use this issue to cause Exim to
crash, resulting in a denial of service, or possibly execute arbitrary
code. The default compiler options for affected releases should reduce the
vulnerability to a denial of service.

It was discovered that Exim incorrectly handled memory in the ESMTP
CHUNKING extension. A remote attacker could use this issue to cause Exim to
crash, resulting in a denial of service, or possibly execute arbitrary
code. The default compiler options for affected releases should reduce the
vulnerability to a denial of service.

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
17.10 artful exim4-daemon-heavy –  4.89-5ubuntu1.1
exim4-daemon-light –  4.89-5ubuntu1.1
17.04 zesty exim4-daemon-heavy –  4.88-5ubuntu1.2
exim4-daemon-light –  4.88-5ubuntu1.2

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References

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