Novell eDirectory NCP over IP length Heap Overflow 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. In addition to LDAP, eDirectory also implements NCP over IP. More information can be obtained from the Novell's web site at http://www.novell.com/products/edirectory/ II. DESCRIPTION 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 vulnerability specifically exists within the NCP functionality of eDirectory. A specially crafted packet will cause eDirectory to read a user specified amount of user supplied data into a static sized heap buffer. The NCP engine does not verify that the supplied data will fit inside the allocated heap buffer bounds. As such, a heap buffer overflow Curr's. 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 iDefense is unaware of any effective workaround for this issue. 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-2006-4177 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 08/16/2006 Initial vendor notification 08/17/2006 Initial vendor response 10/06/2006 Second vendor notification 10/20/2006 Vendor update released 10/21/2006 Public disclosure IX. CREDIT The discoverer of this vulnerability wishes to remain anonymous. Get paid for vulnerability research http://www.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events 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@private 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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