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Our Published Security Findings
InstallShield Update Service ActiveX control - memory corruption, remote code execution.
INFORMATION BULLETIN
InstallShield Update Service Agent ActiveX Vulnerability
[US-CERT Vulnerability Note VU#630017]
October 15, 2008 21:00 GMT Number T-014
______________________________________________________________________________
PROBLEM: The InstallShield Update Service ActiveX control contains a
memory corruption vulnerability that could allow a remote,
unauthenticated attacker to execute arbitrary code ona
vulnerable system.
PLATFORM: InstallShield
DAMAGE: Execute arbitrary code.
SOLUTION: Upgrade to the appropriate version.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. By convincing a user to view a specially
ASSESSMENT: crafted HTML document (e.g., a web page or an HTML email
message or attachment), an attacker may be able to execute
arbitrary code with the privileges of the user. The attacker
could also cause Internet Explorer (or the program using the
WebBrowser control) to crash.
______________________________________________________________________________
CVSS 2 BASE SCORE: 5.1
TEMPORAL SCORE: 4.0
VECTOR: (AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C)
______________________________________________________________________________
LINKS:
DOE-CIRC BULLETIN: http://doecirc.energy.gov/ciac/bulletins/t-014.shtml
ORIGINAL BULLETIN: http://www.kb.cert.org/vuls/id/630017
CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=
CVE-2008-2470
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[***** Start US-CERT Vulnerability Note VU#630017 *****]
Vulnerability Note VU#630017
InstallShield Update Service Agent ActiveX control memory corruption
Overview
The InstallShield Update Service ActiveX control contains a memory corruption
vulnerability that can allow a remote, unauthenticated attacker to execute
arbitrary code on a vulnerable system.
I. Description
The InstallShield Update Service contains an ActiveX control called Update Service
Agent. This ActiveX control is a component that is included with some InstallShield
Windows software installers and is provided by the file isusweb.dll. This ActiveX
control contains a memory corruption vulnerability when the ExecuteRemote() method
is called using a URL that causes the web server to return a 404 error. Newer
versions of the ActiveX control, which may be provided by Macrovision or Acresso,
do not appear to be vulnerable.
II. Impact
By convincing a user to view a specially crafted HTML document (e.g., a web page
or an HTML email message or attachment), an attacker may be able to execute
arbitrary code with the privileges of the user. The attacker could also cause
Internet Explorer (or the program using the WebBrowser control) to crash.
III. Solution
Apply an update
This issue is addressed in the FLEXnet Connect 6.0 Security Patch, which is
available in the Acresso support document Q113020. This update removes the
"Safe for Scripting" setting of the vulnerable control, which prevents the
control from being scripted by Internet Explorer. Because the vulnerable
control may be provided to end-users who do not have the FLEXnet Connect SDK
installed, please consider the following workarounds:
Disable the Update Service Agent ActiveX control in Internet Explorer
The vulnerable ActiveX control can be disabled in Internet Explorer by setting
the kill bit for the following CLSID:
{E9880553-B8A7-4960-A668-95C68BED571E}
More information about how to set the kill bit is available in Microsoft Support
Document 240797. Alternatively, the following text can be saved as a .REG file
and imported to set the kill bit for this control:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{E9880553-B8A7-4960-A668-95C68BED571E}]
"Compatibility Flags"=dword:00000400
Disable ActiveX
Disabling ActiveX controls in the Internet Zone (or any zone used by an
attacker) appears to prevent exploitation of this and other ActiveX
vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can
be found in the "Securing Your Web Browser" document.
Systems Affected
Vendor Status Date Notified Date Updated
Acresso Software Not Vulnerable 2008-09-17 2008-09-18
InstallShield Vulnerable 2008-09-18
Macrovision Unknown 2008-09-18
References
http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://support.installshield.com/kb/view.asp?articleid=Q113020
http://support.microsoft.com/kb/240797
http://www.snort.org/docs/writing_rules/chap2.html
http://www.visolve.com/squid/squid24s1/access_controls.php
Credit
Thanks to Brian Dowling of Simplicity Communications for reporting this
vulnerability.
This document was written by Will Dormann.
Other Information
Date Public: 2008-09-18
Date First Published: 2008-09-18
Date Last Updated: 2008-10-09
CERT Advisory:
CVE-ID(s): CVE-2008-2470
NVD-ID(s): CVE-2008-2470
US-CERT Technical Alerts:
Metric: 2.55
Document Revision: 11
[***** End US-CERT Vulnerability Note VU#630017 *****]
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