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securityvulnsSecurityvulnsSECURITYVULNS:DOC:15262
HistoryDec 01, 2006 - 12:00 a.m.

[Full-disclosure] Layered Defense Advisory: Novell Client 4.91 Format String Vulnerability

2006-12-0100:00:00
vulners.com
6

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Layered Defense Advisory 1 December 2006

1) Affected Software
Novell Client 4.91 SP2
Novell Client 4.91 SP2 Patch Kit
Novell Client 4.91 SP3
Earlier versions may also be vulnerable

2) SeverityRating:
Low - Medium risk
Impact: Read arbitrary memory, denial of service.

3) Description of Vulnerability
A format string vulnerability was discovered within Novell client
4.91 . The vulnerability is due to improper processing of format
strings within NMAS (Novell Modular Authentication Services)
Information message window. An attacker who enters special crafted
format strings in the Username field at the Novell logon and selects
Sequences under the NMAS tab can read data from the winlogon process
stack or read from arbitrary memory, and at a minimum cause a denial
of service.

4) Solution
Fix: Presently no patch is available.
Work around: Disable NMAS Authentication

5) Time Table:
07/15/2006 Reported Vulnerability to Vendor.
08/21/2006 Vendor released Novell Client - 4.91 SP2 Patch Kit which
made the vulnerability worse. (This patch made it easier to read
arbitrary memory)
09/17/2006 Contacted Vendor about increased risk with SP2 Patch Kit
11/28/2006 Received the following message from Vendor :
At this point in time, development has determined this is a very low
priority and apparently it will be some time before the issue is
addressed. I have reported this to our Security Review Board so
development's claim can be re-examined. As such, you certainly have
every right to publish your findings at this time. The bug will
remain open against the product.  Hopefully this can be fixed in
the near future ==================================================
6) CreditsDiscovered by Deral Heiland, www.LayeredDefense.com

7) About Layered DefenseLayered Defense, Is a group of security
professionals that work together on ethical Research, Testing and
Training within the information security arena. http://www.layereddefense.com


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