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Vulnerability Note VU#959049
Multiple COM objects cause memory corruption in Microsoft Internet Explorer
OverviewMicrosoft Internet Explorer (IE) allows instantiation of COM objects not designed for use in the browser, which may allow a remote attacker to execute arbitrary code or crash IE.
I. DescriptionMicrosoft COM
Microsoft COM is a technology that allows programmers to create reusable software components that can be incorporated into applications to extend their functionality. Microsoft COM includes COM+, Distributed COM (DCOM), and ActiveX Controls.
ActiveX controls
ActiveX controls are COM objects that have visual elements. ActiveX controls are traditionally designed to be used in Internet Explorer. A web page can make use of an ActiveX control in various ways, such as by referencing its Class Identifier (CLSID) in an HTML OBJECT tag.
The Problem
Internet Explorer will attempt to instantiate any COM object that is referenced by a web page. Certain COM objects that are not designed for use in Internet Explorer may cause unexpected results, such as executing arbitrary code or crashing the browser.
Exploit code for these vulnerabilities are publicly available.
II. ImpactBy convincing a user to view a specially crafted HTML document (e.g., a web page, an HTML email message, or an email attachment), an attacker could execute arbitrary code with the privileges of the user. The attacker could also cause IE (or the program using the WebBrowser control) to crash.
III. SolutionApply An Update
Apply the appropriate update, as specified in Microsoft Security Bulletin MS06-042. This update sets the "kill bit" for certain CLSID values of COM objects known to be vulnerable. The MS06-042 update is similar to MS06-021, MS06-013, MS05-054, MS05-037, MS05-038, and MS05-052, but it includes additional COM objects.
Microsoft has listed several workarounds in the Microsoft Security Bulletin, including disabling ActiveX controls.
Systems Affected
References
http://www.us-cert.gov/cas/techalerts/TA05-221A.html
http://www.us-cert.gov/cas/techalerts/TA05-284A.html
http://www.us-cert.gov/cas/techalerts/TA05-347A.html
http://www.us-cert.gov/cas/techalerts/TA06-101A.html
http://www.us-cert.gov/cas/techalerts/TA06-220A.html
http://www.kb.cert.org/vuls/id/680526
http://www.kb.cert.org/vuls/id/939605
http://www.kb.cert.org/vuls/id/740372
http://www.microsoft.com/technet/security/bulletin/MS05-037.mspx
http://www.microsoft.com/technet/security/bulletin/MS05-038.mspx
http://www.microsoft.com/technet/security/Bulletin/MS05-052.mspx
http://www.microsoft.com/technet/security/Bulletin/MS05-054.mspx
http://www.microsoft.com/technet/security/Bulletin/MS06-013.mspx
http://www.microsoft.com/technet/security/Bulletin/MS06-021.mspx
http://www.microsoft.com/technet/security/bulletin/ms06-042.mspx
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2087
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1990
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2127
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2831
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1186
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2006-1303
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3638
http://www.nsfocus.com/english/homepage/research/0502.htm
http://secunia.com/advisories/16373/
http://www.securityfocus.com/bid/14511
http://www.securiteam.com/windowsntfocus/5WP0B00GLC.html
http://www.osvdb.org/displayvuln.php?osvdb_id=18612
Credit
Thanks to Microsoft for reporting this vulnerability.
This document was written by Will Dormann.
Other Information
| Date Public | 08/09/2005 |
| Date First Published | 08/09/2005 04:55:24 PM |
| Date Last Updated | 08/09/2006 |
| CERT Advisory | |
| CVE Name | CVE-2005-1990 |
| US-CERT Technical Alerts | |
| Metric | 45.56 |
| Document Revision | 38 |
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