TippingPoint Zero Day Initiative

ABB MicroSCADA Wserver wserver.exe Remote Code Execution Vulnerability

ZDI-13-268: November 24th, 2013

CVSS Score

Affected Vendors

Affected Products


Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of ABB MicroSCADA Wserver. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the wserver.exe component which listens on TCP port 12221. This component performs insufficient bounds checking on user-supplied data which results in stack corruption. An attacker can leverage this situation to execute code under the context of the user running the application.

Vendor Response

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

Disclosure Timeline

    2013-02-13 - Vulnerability reported to vendor
    2013-11-24 - Coordinated public release of advisory


This vulnerability was discovered by:
    Andrea Micalizzi aka rgod