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TITLE:
Novell Client NMAS Login Prompt Format String Weakness

SECUNIA ADVISORY ID:
SA23363

VERIFY ADVISORY:
http://secunia.com/advisories/23363/

CRITICAL:
Not critical

IMPACT:
Exposure of sensitive information, DoS

WHERE:
Local system

SOFTWARE:
Novell Client for Windows NT/2000/XP 4.x
http://secunia.com/product/1516/

DESCRIPTION:
Deral Heiland has reported a weakness in Novell Client, which can be
exploited by malicious, local users to gain knowledge of sensitive
information or cause a DoS (Denial of Service).

The weakness is caused due to a format string error within the
processing of the "Username" field in the NMAS (Novell Modular
Authentication Services) Information message window. This can be
exploited to read arbitrary memory or crash the service via format
string specifiers in the "Username" field and selecting "Sequences"
under the NMAS tab.

The weakness is reported in versions 4.91 SP2, 4.91 SP2 Patch Kit,
and 4.91 SP3. Other versions may also be affected.

SOLUTION:
Apply vendor patch.

PROVIDED AND/OR DISCOVERED BY:
Deral Heiland, Layered Defense Research

ORIGINAL ADVISORY:
Novell:
https://secure-support.novell.com/KanisaPlatform/Publishing/372/3546910_f.SAL_Public.html

Layered Defense Research:
http://www.layereddefense.com/Novell01DEC.html

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About:
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