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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.0930 -- [Win]
                  ABB PCU400 vulnerable to stack overflow
                             29 September 2008

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              ABB PCU400
Publisher:            US-CERT
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-2474

Original Bulletin:    http://www.kb.cert.org/vuls/id/343971

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Vulnerability Note VU#343971
ABB PCU400 vulnerable to stack overflow

Overview

ABB PCU400 contains a vulnerability which can allow a remote,
unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description
The ABB PCU400 application serves as a communication gateway between RTUs
that use the IEC-870-5-104 protocol and the SCADA server. The application
contains a software flaw which allows an attacker to gain full access on
the PCU400 server by sending a specially crafted packet to the X87 web
interface on TCP port 8087.

Note that this issue affects PCU400 installations running the
IEC60870-5-101/104 protocol based on X87.

II. Impact
A remote attacker may be able to execute arbitrary code with the privileges
of the account running the x87 application.

III. Solution

Upgrade or Patch

According to ABB:

This issue is corrected in version 3.5.5 of the x87 executable. To obtain a
patch or upgrade software please contact your vendor. The x87 executable is
considered obsolete in newer versions of the PCU 400 and should be replaced
by the newer x88 or x89 executable where applicable.

Restrict Access

According to ABB:

Unless there is a specific reason, a host based filter like the built-in
firewall in Windows XP should be activated for the port 8087, denying
access to the web interface from a remote location.

Systems Affected

Vendor  Status     Date Notified  Date Updated
ABB     Vulnerable    2008-09-25

References


Credit

This issue was reported by Eyal Udassin and Idan Ofrat of C4 Security.

This document was written by Chris Taschner.
Other Information
Date Public:	2008-09-25
Date First Published:	2008-09-25
Date Last Updated:	2008-09-25
CERT Advisory:	 
CVE-ID(s):	CVE-2008-2474
NVD-ID(s):	CVE-2008-2474
US-CERT Technical Alerts:	 
Metric:	3.28
Document Revision:	12

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