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)