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Microsoft Windows License Logging Service Heap Corruption Vulnerability

TPTI-09-07: November 10th, 2009


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 9229. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Windows. Authentication is not required on certain configurations to exploit this vulnerability.

The specific flaw exists in the handling of RPC calls to the License Logging Service (llssrv.exe). When processing arguments to the LlsrLicenseRequestW method a character array is expected to contain a terminating null byte. By supplying data that does not end in a null it is possible to overlap a call to lstrcatW, resulting in a heap overflow. Successful exploitation of this vulnerability can lead to remote system compromise under the credentials of the SYSTEM account.

Vendor Response

Microsoft has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2009-06-15 - Vulnerability reported to vendor
    2009-11-10 - Coordinated public release of advisory


This vulnerability was discovered by: