Novell eDirectory evtFilteredMonitorEventsRequest Heap Overflow Vulnerability
iDefense Security Advisory 10.21.06 http://www.idefense.com/intelligence/vulnerabilities/ Oct 21, 2006
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/
Remote exploitation of a heap overflow vulnerability in Novell Inc.'s eDirectory product could allow an attacker to execute arbitrary code in the context of the running daemon.
This problem stems from an integer overflow that occurs when allocating memory for attacker supplied data. The evtFilteredMonitorEventsRequest function takes user input and multiplies it by 16, then adds 16 without first validating that an integer overflow will not occur. If allocation succeeds, the function will proceed to loop, filling the memory with partially controllable input. Since the loop is bounded directly by the attacker supplied length value, heap overflow will occur.
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.
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.
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-2006-4509 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
The discoverer of this vulnerability wishes to remain anonymous.
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X. LEGAL NOTICES
Copyright © 2006 iDefense, Inc.
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