[NT] Novell NetWare Client nicm.sys Local Privilege Escalation VulnerabilityNovell NetWare Client nicm.sys Local Privilege Escalation Vulnerability

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Novell NetWare Client nicm.sys Local Privilege Escalation
VulnerabilityNovell NetWare Client nicm.sys Local Privilege Escalation
Vulnerability
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SUMMARY

The <http://www.novell.com/products/clients/> 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". Local exploitation of an input validation
error vulnerability within Novell Inc.'s NetWare Client allows attackers
to execute arbitrary code within the kernel.

DETAILS

Vulnerable Systems:
* Novell's NetWare Client 4.91 SP4 with nicm.sys file version 3.0.0.4

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.

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.

Vendor response:
Novell Inc. has addressed this vulnerability by releasing a patch for the
NetWare Client SP4. For more information visit the following URL:
<http://download.novell.com/Download?buildid=4FmI89wOmg4~>

http://download.novell.com/Download?buildid=4FmI89wOmg4~

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5762>
CVE-2007-5762

Disclosure Timeline:
10/30/2007 - Initial vendor notification
11/13/2007 - Initial vendor response
01/09/2008 - Coordinated public disclosure

ADDITIONAL INFORMATION

The information has been provided by
<mailto:idlabs-advisories@idefense.com> iDefense Labs Security Advisories.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=637>

http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=637

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