===================================================================== CERT-Renater Note d'Information No. 2006/VULN159 _____________________________________________________________________ DATE : 12/04/2006 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Microsoft Windows, systems running Internet Explorer. ====================================================================== National Cyber Alert System Technical Cyber Security Alert TA06-101A Microsoft Windows and Internet Explorer Vulnerabilities Original release date: April 11, 2006 Last revised: -- Source: US-CERT Systems Affected * Microsoft Windows * Microsoft Internet Explorer For more complete information, refer to the Microsoft Security Bulletin Summary for April 2006. Overview 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. I. Description 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) II. 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. III. 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 - * US-CERT Vulnerability Note VU#876678 - * US-CERT Vulnerability Note VU#984473 - * US-CERT Vulnerability Note VU#434641 - * US-CERT Vulnerability Note VU#503124 - * US-CERT Vulnerability Note VU#959049 - * US-CERT Vulnerability Note VU#824324 - * US-CERT Vulnerability Note VU#341028 - * US-CERT Vulnerability Note VU#234812 - * US-CERT Vulnerability Note VU#641460 - * CVE-2006-1359 - * CVE-2006-1245 - * CVE-2006-1388 - * CVE-2006-1185 - * CVE-2006-1186 - * CVE-2006-1188 - * CVE-2006-1189 - * CVE-2006-0003 - * CVE-2006-0012 - * Microsoft Update - * Securing Your Web Browser - ____________________________________________________________________ The most recent version of this document can be found at: ____________________________________________________________________ Feedback can be directed to US-CERT Technical Staff. Please send email to with "TA06-101A Feedback VU#876678" in the subject. ____________________________________________________________________ For instructions on subscribing to or unsubscribing from this mailing list, visit . ____________________________________________________________________ Produced 2006 by US-CERT, a government organization. Terms of use: ____________________________________________________________________ Revision History Apr 11, 2006: Initial release ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================