TippingPoint Zero Day Initiative

IBM Lotus Sametime Community Services Multiplexer Stack Overflow Vulnerability

ZDI-08-028: May 21st, 2008


Affected Vendors

Affected Products

    Lotus Sametime

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 5607, 5698. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of IBM Lotus Sametime. Authentication is not required to exploit this vulnerability.

The specific flaw exists in the handling of long URLs in the Community Services Multiplexer (StMux.exe) listening on TCP port 1533. A specially crafted URL can be passed into a vulnerable sscanf() function that will result in a stack overflow resulting in the ability to execute arbitrary code.

Vendor Response

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

Disclosure Timeline

    2007-12-11 - Vulnerability reported to vendor
    2008-05-21 - Coordinated public release of advisory


This vulnerability was discovered by:
    Manuel Santamarina Suarez