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USN-3493-1: Exim vulnerability

27 November 2017

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



  • exim4 - Exim is a mail transport agent


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

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

Ubuntu 17.10
Ubuntu 17.04

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