TippingPoint Zero Day Initiative
 

Novell Client Trust Heap Overflow Vulnerability

ZDI-07-064: October 31st, 2007

CVE ID

Affected Vendors

Affected Products

    Border Manager

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 5486. For further product information on the TippingPoint IPS:

Vulnerability Details

This 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.

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:

Disclosure Timeline

    2007-07-17 - Vulnerability reported to vendor
    2007-10-31 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    uvinc