Vulnerability Note VU#190939

HP Online Support Services ActiveX AppendStringToFile() arbitrary file writing

Overview

The HP Online Support Services ActiveX control contains a method called AppendStringToFile(). This may allow a remote, unauthenticated attacker to write to files on a vulnerable system.

I. Description

HP Services provides online product support services including HP Instant Support. The HPISDataManager.dll ActiveX control contains the insecure function AppendStringToFile(), which can be exploited by a malicious attacker to execute arbitrary files on a vulnerable system.

Note that the HP Support Services ActiveX control is locked to certain domains, such as hp.com. This means that an attacker would have to subvert the host name lookup methodology on a victim's system or exploit a cross-site scripting vulnerability in one of the allowed domains to exploit this vulnerability.

II. Impact

A remote, unauthenticated attacker could exploit this vulnerability to write to arbitrary files on a vulnerable system.

III. Solution

HP suggests to install HP Instant Support - v1.0.0.24 or later. For installation instructions, please visit the HP Support Document. However, limited testing has shown that this update does not change the behavior with respect to unsafe methods.

From the HP Support Document:

The vulnerabilities can also be resolved by the following procedure:

Set the kill bit for the vulnerable ActiveX control's Class identifier (CLSID) {14C1B87C-3342-445F-9B5E-365FF330A3AC} . The kill bit is set by modifying the data value of the Compatibility Flags DWORD value for the CLSID of this ActiveX control to 0x00000400. This is explained in Microsoft's article KB240797 or subsequent. http://support.microsoft.com/kb/240797

Systems Affected

Vendor	Status	Date Updated
Hewlett-Packard Company	Vulnerable	7-Jun-2008

References

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01422264
http://www.csis.dk/dk/forside/CSIS-RI-0003.pdf

Credit

Hewlett-Packard credits Dennis Rand of CSIS Security Research and Intelligence for discovering this vulnerability.

This document was written by Joseph Pruszynski and Will Dormann.

Other Information

Date Public	06/04/2008
Date First Published	06/06/2008 03:14:46 PM
Date Last Updated	06/07/2008
CERT Advisory
CVE Name	CVE-2007-5604; CVE-2007-5605; CVE-2007-5606; CVE-2007-5607; CVE-2007-5608; CVE-2007-5610; CVE-2008-0952; CVE-2008-0953
US-CERT Technical Alerts
Metric	7.02
Document Revision	18