USN-3493-1: Exim vulnerability
Ubuntu Security Notice USN-3493-1
27th November, 2017
exim4 vulnerability
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 17.10
- Ubuntu 17.04
Summary
Exim could be made to crash or run programs if it received specially
crafted network traffic.
Software description
- 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.
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 17.10:
-
exim4-daemon-heavy
4.89-5ubuntu1.1
-
exim4-daemon-light
4.89-5ubuntu1.1
- Ubuntu 17.04:
-
exim4-daemon-heavy
4.88-5ubuntu1.2
-
exim4-daemon-light
4.88-5ubuntu1.2
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.
References
Source: USN-3493-1: Exim vulnerability
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