USN-3184-1: Irssi vulnerabilities

Ubuntu Security Notice USN-3184-1

1st February, 2017

irssi vulnerabilities

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

Ubuntu 16.10
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS
Ubuntu 12.04 LTS

Summary

Several security issues were fixed in Irssi.

Software description

irssi
– terminal based IRC client

Details

It was discovered that the Irssi buf.pl script set incorrect permissions. A
local attacker could use this issue to retrieve another user's window
contents. (CVE-2016-7553)

Joseph Bisch discovered that Irssi incorrectly handled comparing nicks. A
remote attacker could use this issue to cause Irssi to crash, resulting in
a denial of service, or possibly execute arbitrary code. (CVE-2017-5193)

It was discovered that Irssi incorrectly handled invalid nick messages. A
remote attacker could use this issue to cause Irssi to crash, resulting in
a denial of service, or possibly execute arbitrary code. (CVE-2017-5194)

Joseph Bisch discovered that Irssi incorrectly handled certain incomplete
control codes. A remote attacker could use this issue to cause Irssi to
crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10.
(CVE-2017-5195)

Hanno Böck and Joseph Bisch discovered that Irssi incorrectly handled
certain incomplete character sequences. A remote attacker could use this
issue to cause Irssi to crash, resulting in a denial of service. This issue
only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-5196)

Hanno Böck discovered that Irssi incorrectly handled certain format
strings. A remote attacker could use this issue to cause Irssi to crash,
resulting in a denial of service. (CVE-2017-5356)