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AUSCERT External Security Bulletin Redistribution
28 November 2017
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2017-16943
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running exim4 check for an updated version of the software for their
operating system. Please note: There is exploit code publically
available for this vulnerablity.
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USN-3493-1: Exim vulnerability
Ubuntu Security Notice USN-3493-1
27th November, 2017
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
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.
The problem can be corrected by updating your system to the following package
To update your system, please follow these instructions:
In general, a standard system update will make all the necessary changes.
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