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iDefense Security Advisory 10.21.06: Novell eDirectory evtFilteredMonitorEventsRequest Invalid Free Vulnerability
From: iDefense Labs <labs-no-reply () idefense com>
Date: Sun, 22 Oct 2006 00:43:44 -0400

Novell eDirectory evtFilteredMonitorEventsRequest Invalid Free Vulnerability

iDefense Security Advisory 10.21.06
http://www.idefense.com/intelligence/vulnerabilities/
Oct 21, 2006

I. BACKGROUND

Novell eDirectory is a cross-platform lightweight directory access
protocol (LDAP) server. More information can be found on Novell's web
site at http://www.novell.com/products/edirectory/

II. DESCRIPTION

Remote exploitation of an invalid free vulnerability in Novell Inc.'s
eDirectory product could allow an attacker to execute arbitrary code in
the context of the running daemon.

The evtFilteredMonitorEventsRequest function takes an array of objects
that contain an allocated string and two integer values. When an
attacker supplies less objects than is specified by the number of
objects to be sent, an invalid free condition arises. Due to the cleanup
loop being bound by the number supplied within the request rather than
the number actually processed, the free() function will be called on
values on the heap which are outside of the bounds of the allocated
array.

III. ANALYSIS

Successful exploitation of this vulnerability could allow an attacker to
crash the server or execute arbitrary code. No credentials are required.
Typically this daemon runs with administrator privileges.

IV. DETECTION

iDefense has confirmed the existence of this vulnerability in version
8.8.1 of Novell Inc.'s eDirectory server. Version 8.8 was also tested
and found to be vulnerable. Earlier versions are suspected to be
vulnerable.

V. WORKAROUND

It is possible to disable the LDAP service from running via the
ndsmodules.conf file which is usually located in
/etc/opt/novell/eDirectory/conf. However, doing so greatly reduces the
functionality of this program.

VI. VENDOR RESPONSE

Novell has addressed this vulnerability with eDirectory 8.8.1 FTF1.

You can obtain the Linux/Unix version of this update from their site at:
http://support.novell.com/servlet/filedownload/sec/pub/edir881ftf_1.tgz/
The windows version of this update is available at:
http://support.novell.com/servlet/filedownload/sec/pub/edir881ftf_1.exe/

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4510 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

08/17/2006  Initial vendor notification
08/18/2006  Initial vendor response
10/06/2006  Second vendor notification
10/20/2006  Vendor update released
10/21/2006  Public disclosure

IX. CREDIT

Joshua J. Drake (iDefense Labs) is credited with the discover of this
vulnerability.

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http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2006 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
email customerservice () idefense com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.



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