Subject: [ASA-201706-11] irssi: denial of service

Arch Linux Security Advisory ASA-201706-11
==========================================

Severity: Medium
Date    : 2017-06-12
CVE-ID  : CVE-2017-9468 CVE-2017-9469
Package : irssi
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-293

Summary
=======

The package irssi before version 1.0.3-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 1.0.3-1.

# pacman -Syu "irssi>=1.0.3-1"

The problems have been fixed upstream in version 1.0.3.

Workaround
==========

None.

Description
===========

- CVE-2017-9468 (denial of service)

In Irssi before 1.0.3, when receiving a DCC message without source
nick/host, it attempts to dereference a NULL pointer. Thus, remote IRC
servers can cause a crash.

- CVE-2017-9469 (denial of service)

In Irssi before 1.0.3, when receiving certain incorrectly quoted DCC
files, it tries to find the terminating quote one byte before the
allocated memory. Thus, remote attackers might be able to cause a
crash.

Impact
======

A remote attacker can cause a denial of service by sending a crafted
DCC message.

References
==========

https://github.com/irssi/irssi/commit/fb08fc7f1aa6b2e616413d003bf021612301ad55
http://openwall.com/lists/oss-security/2017/06/06/4
https://irssi.org/security/irssi_sa_2017_06.txt
https://security.archlinux.org/CVE-2017-9468
https://security.archlinux.org/CVE-2017-9469