iDefense Security Advisory 01.09.08 http://labs.idefense.com/intelligence/vulnerabilities/ Jan 09, 2008 I. BACKGROUND The Novell Client software provides a workstation with access to Novell NetWare networks as well as Novell Open Enterprise Server (OES) services. Novell Clients can access the full range of Novell services such as authentication via Novell eDirectory, network browsing and service resolution, and secure and reliable file system access. More information about the Novel Client can be found on the vendor's web site at the following URL. http://www.novell.com/products/clients/ II. DESCRIPTION Local exploitation of an input validation error vulnerability within Novell Inc.'s NetWare Client allows attackers to execute arbitrary code within the kernel. When the Novell NetWare Client is installed on a Windows-based operating system, the driver nicm.sys will be loaded at system startup. This driver allows any user to open the device "\\.\nicm" and issue IOCTLs with a buffering mode of METHOD_NEITHER. Due to insufficient input validation, user mode software can pass kernel addresses as arguments to the driver. By using specially constructed input, a malicious user can use functionality within the driver to patch kernel addresses and execute arbitrary code in kernel mode. III. ANALYSIS Exploitation of this vulnerability allows a local attacker to execute arbitrary code within the kernel. To exploit the vulnerability, the attacker must be able execute a specially crafted executable on the targeted computer. IV. DETECTION iDefense has confirmed the existence of this vulnerability in nicm.sys, file version 126.96.36.199, as included with Novell's NetWare Client 4.91 SP4. Other versions may also be vulnerable. V. WORKAROUND iDefense is currently unaware of any workaround for this issue. VI. VENDOR RESPONSE Novell Inc. has addressed this vulnerability by releasing a patch for the NetWare Client SP3. For more information visit the following URL. http://download.novell.com/Download?buildid=4FmI89wOmg4~ VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-5762 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 10/30/2007 Initial vendor notification 11/13/2007 Initial vendor response 01/09/2008 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by Stephen Fewer of Harmony Security (www.harmonysecurity.com) Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2008 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@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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