US-CERT Technical Cyber Security Alert TA06-073A -- Microsoft Office and Excel Vulnerabilities

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                    National Cyber Alert System

            Technical Cyber Security Alert TA06-073A

Microsoft Office and Excel Vulnerabilities

Original release date: March 14, 2006
Last revised: –
Source: US-CERT

Systems Affected

 * Microsoft Office for Windows and Mac OS X
 * Microsoft Excel for Windows and Mac OS X
 * Microsoft Works Suite for Windows

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

Overview

Microsoft has released updates that address critical vulnerabilities
in Microsoft Office and Excel. 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 March 2006 addresses
vulnerabilities in Microsoft Office and Excel. Further information is
available in the following US-CERT Vulnerability Notes:

VU#339878 - Microsoft Excel malformed parsing format file memory
corruption vulnerability

Microsoft Excel contains a memory corruption vulnerability. This
vulnerability may allow a remote attacker to execute arbitrary code on
a vulnerable system.
(CVE-2006-0028)

VU#104302 - Microsoft Excel malformed record memory corruption
vulnerability

Microsoft Excel fails to properly validate records. This vulnerability
may allow a remote attacker to execute arbitrary code on a vulnerable
system.
(CVE-2006-0031)

VU#123222 - Microsoft Excel malformed graphic memory corruption
vulnerability

Microsoft Excel fails to properly validate graphics. This
vulnerability may allow a remote attacker to execute arbitrary code on
a vulnerable system.
(CVE-2006-0030)

VU#235774 - Microsoft Excel malformed description memory corruption
vulnerability

Microsoft Excel fails to properly validate the description field. This
vulnerability may allow a remote attacker to execute arbitrary code on
a vulnerable system.
(CVE-2006-0029)

VU#642428 - Microsoft Excel fails to properly perform range validation
when parsing document files

Microsoft Excel contains an error in range validation, which may allow
a remote unauthenticated, attacker to execute arbitrary code on a
vulnerable system.
(CVE-2005-4131)

VU#682820 - Microsoft Office routing slip buffer overflow

Microsoft Office contains a buffer overflow in the parsing of routing
slips, which may allow an attacker to execute arbitrary code on a
vulnerable system.
(CVE-2006-0009)

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

Workarounds

Please see the following US-CERT Vulnerability Notes for workarounds.

Appendix A. References

 * Microsoft Security Bulletin Summary for March 2006 -
   <http://www.microsoft.com/technet/security/bulletin/ms06-mar.mspx>

 * US-CERT Vulnerability Note VU#339878 -
   <http://www.kb.cert.org/vuls/id/339878>

 * US-CERT Vulnerability Note VU#104302 -
   <http://www.kb.cert.org/vuls/id/104302>

 * US-CERT Vulnerability Note VU#123222 -
   <http://www.kb.cert.org/vuls/id/123222>

 * US-CERT Vulnerability Note VU#235774 -
   <http://www.kb.cert.org/vuls/id/235774>

 * US-CERT Vulnerability Note VU#642428 -
   <http://www.kb.cert.org/vuls/id/642428>

 * US-CERT Vulnerability Note VU#682820 -
   <http://www.kb.cert.org/vuls/id/682820>

 * CVE-2005-4131 -
   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-4131>

 * CVE-2006-0009 -
   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0009>

 * CVE-2006-0028 -
   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0028>

 * CVE-2006-0029 -
   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0029>

 * CVE-2006-0030 -
   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0030>

 * CVE-2006-0031 -
   <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0031>

 * Microsoft Update - <https://update.microsoft.com/microsoftupdate>

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The most recent version of this document can be found at:

 <http://www.us-cert.gov/cas/techalerts/TA06-073A.html>

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Feedback can be directed to US-CERT Technical Staff. Please send
email to <[email protected]> with "TA06-073A Feedback VU#339878" in the
subject.

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Produced 2006 by US-CERT, a government organization.

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Revision History

March 14, 2006: Initial release

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