[arch-security] [ASA-201609-20] irssi: arbitrary code execution

[Jelle van der Waa]

Arch Linux Security Advisory ASA-201609-20
==========================================

Severity: High
Date    : 2016-09-22
CVE-ID  : CVE-2016-7045
Package : irssi
Type    : arbitrary code execution
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package irssi before version 0.8.20-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 0.8.20-1.

# pacman -Syu "irssi>=0.8.20-1"

The problem has been fixed upstream in version 0.8.20.

Workaround
==========

None.

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

The format_send_to_gui() function does not validate the length of the string
before incrementing the `ptr' pointer in all cases.

If that happens, the pointer `ptr' can be incremented twice and thus end past
the boundaries of the original `dup' buffer.

Remote code execution might be difficult since only Nuls are written.

Impact
======

A remote attacker can perform a denial of service attack or possibly execute
arbitrary code on the affected host.

References
==========

https://irssi.org/security/irssi_sa_2016.txt
http://www.openwall.com/lists/oss-security/2016/09/21/11
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7045
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