==========================================================================
Ubuntu Security Notice USN-3590-1
March 06, 2018

irssi vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Irssi.

Software Description:
- irssi: terminal based IRC client

Details:

It was discovered that Irssi incorrectly handled certain empty
nick names. An attacker could possibly use this issue to cause a denial
of service. (CVE-2018-7050)

It was discovered that Irssi incorrectly handled certain nick names.
An attacker could possibly use this to access sensitive information.
(CVE-2018-7051)

It was discovered that Irssi incorrectly handled an increase in the
number of windows. An attacker could possibly use this issue to cause
a denial of service. (CVE-2018-7052)

It was discovered that Irssi incorrectly handled certain messages.
An attacker could possibly use this issue to cause a denial of service
or execute arbitrary code. This issue only affected Ubuntu 16.04 LTS
and Ubuntu 17.10. (CVE-2018-7053)

It was discovered that Irssi incorrectly handled certain
disconnections. An attacker could possibly use this to cause a denial
of service or execute arbitrary code. This issue only affected Ubuntu
17.10. (CVE-2018-7054)

Update instructions:

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

Ubuntu 17.10:
  irssi                           1.0.4-1ubuntu2.3

Ubuntu 16.04 LTS:
  irssi                           0.8.19-1ubuntu1.7

Ubuntu 14.04 LTS:
  irssi                           0.8.15-5ubuntu3.5

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

References:
  https://usn.ubuntu.com/usn/usn-3590-1
  CVE-2018-7050, CVE-2018-7051, CVE-2018-7052, CVE-2018-7053,
  CVE-2018-7054, CVE-2018-7073

Package Information:
  https://launchpad.net/ubuntu/+source/irssi/1.0.4-1ubuntu2.3
  https://launchpad.net/ubuntu/+source/irssi/0.8.19-1ubuntu1.7
  https://launchpad.net/ubuntu/+source/irssi/0.8.15-5ubuntu3.5