The most severe flaw was a remote code execution vulnerability in the Microsoft Workstation Service (CVE-2006-4687), allowing unauthenticated attackers to take control of affected systems.
Additional critical vulnerabilities impacted Windows, Internet Explorer, and Office, potentially leading to elevation of privilege, information disclosure, or denial of service.
US-CERT strongly urged users and administrators to apply all vendor-supplied patches immediately and implement general security best practices to mitigate these significant risks.
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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 -
<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_Ex
plorer>
____________________________________________________________________
The most recent version of this document can be found at:
<http://www.us-cert.gov/cas/techalerts/TA06-101A.html>
____________________________________________________________________
Feedback can be directed to US-CERT Technical Staff. Please send
email to <
subject.
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For instructions on subscribing to or unsubscribing from this
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Produced 2006 by US-CERT, a government organization.
Terms of use:
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____________________________________________________________________
Revision History
Apr 11, 2006: Initial release
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