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AUSCERT External Security Bulletin Redistribution
ESB-2019.2800
USN-4075-1: Exim vulnerability
26 July 2019
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AusCERT Security Bulletin Summary
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Product: exim4
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-13917
Reference: ESB-2019.2796
Original Bulletin:
https://usn.ubuntu.com/4075-1/
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USN-4075-1: Exim vulnerability
25 July 2019
exim4 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.04
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Exim could be made to run programs as an administrator if it received specially
crafted network traffic.
Software Description
o exim4 - Exim is a mail transport agent
Details
Jeremy Harris discovered that Exim incorrectly handled sort expansions. In
environments where sort expansions are used, a remote attacker could possibly
use this issue to execute arbitrary code as root.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.04
exim4-daemon-heavy - 4.92-4ubuntu1.2
exim4-daemon-light - 4.92-4ubuntu1.2
Ubuntu 18.04 LTS
exim4-daemon-heavy - 4.90.1-1ubuntu1.3
exim4-daemon-light - 4.90.1-1ubuntu1.3
Ubuntu 16.04 LTS
exim4-daemon-heavy - 4.86.2-2ubuntu2.4
exim4-daemon-light - 4.86.2-2ubuntu2.4
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
o CVE-2019-13917
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