==========================================================================
Ubuntu Security Notice USN-3465-1
October 26, 2017

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:

Brian Carpenter discovered that Irssi incorrectly handled messages with
invalid time stamps. A malicious IRC server could use this issue to cause
Irssi to crash, resulting in a denial of service. (CVE-2017-10965)

Brian Carpenter discovered that Irssi incorrectly handled the internal nick
list. A malicious IRC server could use this issue to cause Irssi to crash,
resulting in a denial of service. (CVE-2017-10966)

Joseph Bisch discovered that Irssi incorrectly removed destroyed channels
from the query list. A malicious IRC server could use this issue to cause
Irssi to crash, resulting in a denial of service. (CVE-2017-15227)

Hanno BAPck discovered that Irssi incorrectly handled themes. If a user were
tricked into using a malicious theme, a attacker could use this issue to
cause Irssi to crash, resulting in a denial of service. (CVE-2017-15228)

Joseph Bisch discovered that Irssi incorrectly handled certain DCC CTCP
messages. A malicious IRC server could use this issue to cause Irssi to
crash, resulting in a denial of service. (CVE-2017-15721)

Joseph Bisch discovered that Irssi incorrectly handled certain channel IDs.
A malicious IRC server could use this issue to cause Irssi to crash,
resulting in a denial of service. (CVE-2017-15722)

Joseph Bisch discovered that Irssi incorrectly handled certain long nicks
or targets. A malicious IRC server could use this issue to cause Irssi to
crash, resulting in a denial of service. (CVE-2017-15723)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.10:
  irssi                           1.0.4-1ubuntu2.1

Ubuntu 17.04:
  irssi                           0.8.20-2ubuntu2.2

Ubuntu 16.04 LTS:
  irssi                           0.8.19-1ubuntu1.5

Ubuntu 14.04 LTS:
  irssi                           0.8.15-5ubuntu3.3

After a standard system update you need to restart Irssi to make all the
necessary changes.

References:
  https://www.ubuntu.com/usn/usn-3465-1
  CVE-2017-10965, CVE-2017-10966, CVE-2017-15227, CVE-2017-15228,
  CVE-2017-15721, CVE-2017-15722, CVE-2017-15723

Package Information:
  https://launchpad.net/ubuntu/+source/irssi/1.0.4-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/irssi/0.8.20-2ubuntu2.2
  https://launchpad.net/ubuntu/+source/irssi/0.8.19-1ubuntu1.5
  https://launchpad.net/ubuntu/+source/irssi/0.8.15-5ubuntu3.3