Microsoft Windows and Internet Explorer Vulnerabilities

• Microsoft Windows
• Microsoft Internet Explorer

For more complete information, refer to the Microsoft Security Bulletin Summary for April 2006.

Microsoft has released updates that address critical vulnerabilities in Microsoft Windows and Internet Explorer. Exploitation of these vulnerabilities could allow a remote, unauthenticated attacker to execute arbitrary code or cause a denial of service on a vulnerable system.

Microsoft Security Bulletin Summary for April 2006 addresses vulnerabilities in Microsoft Windows and Internet Explorer. Further information is available in the following US-CERT Vulnerability Notes:

VU#876678 - Microsoft Internet Explorer createTextRange() vulnerability 

Microsoft Internet Explorer fails to properly handle the createTextRange() DHTML method, possibly allowing a remote, unauthenticated attacker to execute arbitrary code. 
(CVE-2006-1359)

VU#984473 - Microsoft Internet Explorer contains overflow in processing script action handlers 

A vulnerability in the Microsoft Internet Explorer web browser could allow a remote attacker to crash the browser or possibly execute arbitrary code on a vulnerable system. 
(CVE-2006-1245)

VU#434641 - Microsoft Internet Explorer may automatically execute HTA files 

Microsoft Internet Explorer fails to properly handle HTA files. This vulnerability may allow a remote attacker to execute arbitrary code. 
(CVE-2006-1388)

VU#503124 - Microsoft Internet Explorer fails to handle specially crafted, malformed HTML 

Microsoft Internet Explorer fails to properly handle malformed HTML. This vulnerability may allow a remote attacker to execute arbitrary code on a vulnerable system. 
(CVE-2006-1185)

VU#959049 - Multiple COM objects cause memory corruption in Microsoft Internet Explorer 

Microsoft Internet Explorer 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. 
(CVE-2006-1186)

VU#824324 - Microsoft Internet Explorer fails to properly handle HTML elements with a specially crafted tag 

Microsoft Internet Explorer fails to properly handle HTML element tags, which may allow a remote, unauthenticated attacker to execute arbitrary code. 
(CVE-2006-1188)

VU#341028 - Microsoft Internet Explorer fails to properly handle double-byte characters in specially crafted URLs 

Microsoft Internet Explorer fails to properly handle double-byte characters in URLs, which may allow a remote, unauthenticated attacker to execute arbitrary code. 
(CVE-2006-1189)

VU#234812 - Microsoft Windows contains a vulnerability in the RDS.Dataspace ActiveX control in MDAC 

Microsoft Windows fails to properly handle the RDS.Dataspace ActiveX control possibly allowing a remote attacker to execute arbitrary code. 
(CVE-2006-0003)

VU#641460 - Microsoft Windows Explorer fails to properly handle COM objects 

Microsoft Windows fails to properly handle COM Objects. This vulnerability may allow a remote unauthenticated attacker to execute arbitrary code on a vulnerable system. 
(CVE-2006-0012)

Impact

A remote, unauthenticated attacker could execute arbitrary code with the privileges of the user. If the user is logged on with administrative privileges, the attacker could take complete control of an affected system. An attacker may also be able to cause a denial of service.

Solution

Apply Updates

Microsoft has provided updates for these vulnerabilities in the Security Bulletins and on the Microsoft Update site.

Workarounds

Please see the US-CERT Vulnerability Notes for workarounds. Many of these vulnerabilities can be mitigated by following the instructions listed in the Securing Your Web Browser document. 
 

Appendix A. References

• Microsoft Security Bulletin Summary for April 2006 - http://www.microsoft.com/technet/security/bulletin/ms06-apr.mspx
• US-CERT Vulnerability Note VU#876678 - http://www.kb.cert.org/vuls/id/876678
• US-CERT Vulnerability Note VU#984473 - http://www.kb.cert.org/vuls/id/984473
• US-CERT Vulnerability Note VU#434641 - http://www.kb.cert.org/vuls/id/434641
• US-CERT Vulnerability Note VU#503124 - http://www.kb.cert.org/vuls/id/503124
• US-CERT Vulnerability Note VU#959049 - http://www.kb.cert.org/vuls/id/959049
• US-CERT Vulnerability Note VU#824324 - http://www.kb.cert.org/vuls/id/824324
• US-CERT Vulnerability Note VU#341028 - http://www.kb.cert.org/vuls/id/341028
• US-CERT Vulnerability Note VU#234812 - http://www.kb.cert.org/vuls/id/234812
• US-CERT Vulnerability Note VU#641460 - http://www.kb.cert.org/vuls/id/641460
• CVE-2006-1359 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1359
• CVE-2006-1245 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1245
• CVE-2006-1388 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1388
• CVE-2006-1185 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1185
• CVE-2006-1186 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1186
• CVE-2006-1188 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1188
• CVE-2006-1189 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1189
• CVE-2006-0003 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0003
• CVE-2006-0012 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0012
• Microsoft Update - https://update.microsoft.com/microsoftupdate
• Securing Your Web Browser - http://www.us-cert.gov/reading_room/securing_browser/#Internet_Explorer

Feedback can be directed to the US-CERT Technical Staff.

Revision History

• April 11, 2006: Initial release
   

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