USN-929-1: irssi vulnerabilities

Ubuntu Security Notice USN-929-1

15th April, 2010

irssi vulnerabilities

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

  • Ubuntu 9.10
  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS

Software description

  • irssi


It was discovered that irssi did not perform certificate host validation
when using SSL connections. An attacker could exploit this to perform a man
in the middle attack to view sensitive information or alter encrypted
communications. (CVE-2010-1155)

Aurelien Delaitre discovered that irssi could be made to dereference a NULL
pointer when a user left the channel. A remote attacker could cause a
denial of service via application crash. (CVE-2010-1156)

This update also adds SSLv3 and TLSv1 support, while disabling the old,
insecure SSLv2 protocol.

Update instructions

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

Ubuntu 9.10:
irssi 0.8.14-1ubuntu1.1
Ubuntu 9.04:
irssi 0.8.12-6ubuntu1.2
Ubuntu 8.10:
irssi 0.8.12-4ubuntu2.2
Ubuntu 8.04 LTS:
irssi 0.8.12-3ubuntu3.2

To update your system, please follow these instructions:

After a standard system upgrade you need to restart irssi to effect the
necessary changes.


CVE-2010-1155, CVE-2010-1156