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RealFlex RealWin buffer overflow

Vulnerability Note VU#976484

Original Release Date: 2008-12-02 | Last Revised: 2009-01-13

Overview

RealFlex RealWin demo version contains a vulnerability in the way "FC_INFOTAG/SET_CONTROL" packets are processed.

Description

RealFlex RealWin is SCADA server software that includes a Human Machine Interface (HMI) componant and runs on Microsoft Windows 2000 or XP. The demo version of RealWin contains a stack overflow in the way malicious "FC_INFOTAG/SET_CONTROL" packets are processed. According to Reversemode:

The bug is a classic stack overflow while processing a specially crafted FC_INFOTAG/SET_CONTROL packet. RealWin server accepts connections from FlewWin clients which use a propietary protocol. We can exploit this flaw from remote without having valid credentials.

Note that the non-demo version of RealWin has encryption protocol methods in place which calculate length of transmitted/received packets, preventing this buffer overflow.

Impact

This vulnerability could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service.

Solution

Update
RealFlex has made a fixed version of the demo software available to address this issue. See http://www.realflex.com/download/form.php for more information.

Restrict Access

Restrict network access to hosts that require connections to the demo version of RealWin. Do not allow access to RealWin from untrusted networks such as the internet.

Vendor Information

It appears that RealFlex (including RealWin and other products) was spun off from from DATAC (also known as: DCIL, DATAC Control International, Ltd., DATACONLINE) and that DATAC remains a licensed distributor of RealWin and other RealFlex products.

976484
 
Affected   Unknown   Unaffected

DatacOnline

Updated:  December 02, 2008

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

DatacOnline

Notified:  November 13, 2008 Updated:  December 18, 2008

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

RealFlex

Updated:  December 18, 2008

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Credit

This issue was reported by Ruben Santamarta of Reversemode

This document was written by Chris Taschner.

Other Information

CVE IDs: CVE-2008-4322
Severity Metric: 2.48
Date Public: 2008-09-26
Date First Published: 2008-12-02
Date Last Updated: 2009-01-13 15:57 UTC
Document Revision: 15

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