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irssi: Execution of arbitrary code


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200909-13 / irssi
Release Date September 12, 2009
Latest Revision September 12, 2009: 01
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-irc/irssi < 0.8.13-r1 >= 0.8.13-r1 All supported architectures

Related bugreports: #271875


A remotely exploitable off-by-one error leading to a heap overflow was found in irssi which might result in the execution of arbitrary code.

2.  Impact Information


irssi is a modular textUI IRC client with IPv6 support.


Nemo discovered an off-by-one error leading to a heap overflow in irssi's event_wallops() parsing function.


A remote attacker might entice a user to connect to a malicious IRC server, use a man-in-the-middle attack to redirect a user to such a server or use ircop rights to send a specially crafted WALLOPS message, which might result in the execution of arbitrary code with the privileges of the user running irssi.

3.  Resolution Information


There is no known workaround at this time.


All irssi users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-irc/irssi-0.8.13-r1"

4.  References


Page updated September 12, 2009

Summary: This is a Gentoo Linux Security Advisory

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