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AUSCERT External Security Bulletin Redistribution
ESB-2018.0121
Irssi vulnerabilities
11 January 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: irssi
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-5208 CVE-2018-5207 CVE-2018-5206
CVE-2018-5205
Original Bulletin:
http://www.ubuntu.com/usn/usn-3527-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running irssi check for an updated version of the software for their
operating system.
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USN-3527-1: Irssi vulnerabilities
Ubuntu Security Notice USN-3527-1
10th January, 2018
irssi vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 17.10
Ubuntu 17.04
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS
Summary
Several security issues were fixed in Irssi.
Software description
irssi - terminal based IRC client
Details
Joseph Bisch discovered that Irssi incorrectly handled incomplete escape
codes. If a user were tricked into using malformed commands or opening
malformed files, an attacker could use this issue to cause Irssi to crash,
resulting in a denial of service. (CVE-2018-5205)
Joseph Bisch discovered that Irssi incorrectly handled settings the channel
topic without specifying a sender. A malicious IRC server could use this
issue to cause Irssi to crash, resulting in a denial of service.
(CVE-2018-5206)
Joseph Bisch discovered that Irssi incorrectly handled incomplete variable
arguments. If a user were tricked into using malformed commands or opening
malformed files, an attacker could use this issue to cause Irssi to crash,
resulting in a denial of service. (CVE-2018-5207)
Joseph Bisch discovered that Irssi incorrectly handled completing certain
strings. An attacker could use this issue to cause Irssi to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2018-5208)
Update instructions
The problem can be corrected by updating your system to the following package version:
Ubuntu 17.10:
irssi 1.0.4-1ubuntu2.2
Ubuntu 17.04:
irssi 0.8.20-2ubuntu2.3
Ubuntu 16.04 LTS:
irssi 0.8.19-1ubuntu1.6
Ubuntu 14.04 LTS:
irssi 0.8.15-5ubuntu3.4
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart Irssi to make all the
necessary changes.
References
CVE-2018-5205, CVE-2018-5206, CVE-2018-5207, CVE-2018-5208
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