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.
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.
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.
iDefense has confirmed the existence of this vulnerability in nicm.sys, file version 188.8.131.52, as included with Novell's NetWare Client 4.91 SP4. Other versions may also be vulnerable.
iDefense is currently unaware of any workaround for this issue.
Novell Inc. has addressed this vulnerability by releasing a patch for the NetWare Client SP3. For more information visit the following URL.
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.
10/30/2007 Initial vendor notification
11/13/2007 Initial vendor response
01/09/2008 Coordinated public disclosure
This vulnerability was reported to iDefense by Stephen Fewer of Harmony Security (www.harmonysecurity.com)
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