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