[NT] Novell Client Trust Heap Overflow Vulnerability

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Novell Client Trust Heap Overflow Vulnerability
------------------------------------------------------------------------


SUMMARY

A vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Novell software which utilize the Novell
Client Trust. Authentication is not required to exploit this
vulnerability.

DETAILS

Vulnerable Systems:
* Novell BorderManager version 3.8

The specific flaw exists in the Novell Client Trust application,
clntrust.exe, which listens by default on UDP port 3024 on Novell client
machines. During a validation request, the Client Trust process copies a
user-supplied Novell tree name until a wide-character backslash or a NULL
is encountered. If neither is found within the data, the process will copy
excess data which later overflows a static buffer during a call to
wsprintfA.

Vendor Response:
Novell has issued an update to correct this vulnerability. More details
can be found at:
<http://download.novell.com/Download?buildid=AuOWp2Xsvmc~>
http://download.novell.com/Download?buildid=AuOWp2Xsvmc~

<Disclosure Timeline:> Disclosure Timeline:
2007.07.17 - Vulnerability reported to vendor
- Digital Vaccine released to TippingPoint customers
2007.10.25 - Coordinated public release of advisory

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5767>
CVE-2007-5767


ADDITIONAL INFORMATION

The information has been provided by <mailto:zdi-disclosures@xxxxxxxx>
The Zero Day Initiative (ZDI).
The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-07-064.html>
http://www.zerodayinitiative.com/advisories/ZDI-07-064.html



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