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[Full-disclosure] iDefense Security Advisory 05.10.07: Novell NetMail NMDMC Buffer Overflow Vulnerability

From: iDefense Labs <labs-no-reply_at_nospam>
Date: Thu May 10 2007 - 20:44:00 GMT
To: vulnwatch@vulnwatch.org, full-disclosure@lists.grok.org.uk, bugtraq@securityfocus.com


Novell NetMail NMDMC Buffer Overflow Vulnerability

iDefense Security Advisory 05.10.07
http://labs.idefense.com/intelligence/vulnerabilities/ May 10, 2007

I. BACKGROUND Novell Inc.'s NetMail is an e-mail and calendar system that is based on standard Internet protocols. More information can be found at the URL shown below.

http://www.novell.com/products/netmail/

II. DESCRIPTION Remote exploitation of a buffer overflow vulnerability within Novell Inc.'s NetMail allows attackers to execute arbitrary code with the privileges of the service.

This vulnerability specifically exists within the SSL version of the
"NMDMC.EXE" service. The application does not perform sufficient input
validation when copying data into a fixed size stack buffer. When processing a specially crafted request made to this service, a stack-based buffer overflow occurs leading to corruption of program control registers saved on the stack.

III. ANALYSIS Exploitation allows attackers to execute code in the context of the running service. By default this service runs with the privileges of
"NetMailService".

No authentication is required to reach the vulnerable code. Additionally, this is an SSL based service which complicates writing IDS signatures.

It appears that the non-SSL version of this service is not vulnerable.

IV. DETECTION iDefense has confirmed the existence of this vulnerability within version 3.52e_FTF2 of Novell Inc's NetMail. Older versions are suspected to be vulnerable.

V. WORKAROUND Employ firewalls to minimize the exposure of this service.

VI. VENDOR RESPONSE Novell has addressed this vulnerability in the beta release of Novell NetMail 3.52f. For more information, consult the document located at the following URL.

http://download.novell.com/Download?buildid=Ad2xk29hHTg~

VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

VIII. DISCLOSURE TIMELINE 02/07/2007 Initial vendor notification 02/08/2007 Initial vendor response 05/10/2007 Public disclosure

IX. CREDIT The discoverer of this vulnerability wishes to remain anonymous.

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X. LEGAL NOTICES Copyright 2007 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 e-mail 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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