ABB MicroSCADA Wserver wserver.exe Remote Code Execution Vulnerability

November 24th, 2013
ZDI-13-268 ZDI-CAN-1772

CVE ID

CVSS Score

7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected Vendors

ABB

Affected Products

MicroSCADA

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.

Additional Details

ABB has issued an update to correct this vulnerability. More details can be found at:
http://www05.abb.com/global/scot/scot229.nsf/veritydisplay/41ccfa8ccd0431e6c1257c1200395574/$file/ABB_SoftwareVulnerabilityHandlingAdvisory_ABB-VU-PSAC-1MRS235805.pdf

Disclosure Timeline

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

Credit

Andrea Micalizzi aka rgod

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