Ubuntu Security Notice USN-3493-1
27th November, 2017
exim4 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
Exim could be made to crash or run programs if it received specially crafted network traffic.
Software description
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
CVE-2017-16943
Continue reading...
27th November, 2017
exim4 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.10
- Ubuntu 17.04
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
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
CVE-2017-16943
Continue reading...
