SecurityReason - Microsoft Excel SELECTION Record Memory Corruption Vulnerability

Advisory Text :

NSFOCUS Security Advisory (SA2006-05)

Microsoft Excel SELECTION Record Memory Corruption Vulnerability

Release Date: 2006-07-12

CVE ID: CVE-2006-1302

http://www.nsfocus.com/english/homepage/research/0605.htm

Affected systems & software
===================
Microsoft Excel 2000
Microsoft Excel 2002
Microsoft Excel 2003

Unaffected systems & software
===================

Summary
=========

NSFocus Security Team discovered a memory corruption vulnerability in
Microsoft
Excel's processing of SELECTION record, which allows remote attackers to
run
arbitrary via carefully crafted Excel files.

Description
============

Excel does not perform sufficient check for certain field when processing
SELECTION record. During some data copying operation the user-supplied data

might be used for the copying, resulting in memory corruption and arbitrary

code execution.

Attackers can craft an Excel file with malformed SELECTION record and
allure
users to open it via instant messaging tools, e-mail or other vectors,
resulting
in arbitrary code execution with the privilege of the user. If the user is

the administrator, then attackers might take complete control over the
system.

Workaround
=============

Do not open any Excel file from untrusted sources.

Vendor Status
==============

2006.03.30 Informed the vendor
2006.04.03 Vendor confirmed the vulnerability
2006.07.11 Microsoft has released a security bulletin (MS06-037) and
related
patches.

For more details about the security bulletin, please refer to:
http://www.microsoft.com/technet/security/bulletin/MS06-037.mspx

Additional Information
========================

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-1302 to this issue. This is a candidate for inclusion in the

CVE list (http://cve.mitre.org), which standardizes names for security
problems.
Candidates may change significantly before they become official CVE
entries.

Acknowledgment
===============

Wen Yujie of NSFocus Security Team found the vulnerability.

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==========
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NSFOCUS Security Team <security (at) nsfocus (dot) com [email concealed]>
NSFOCUS INFORMATION TECHNOLOGY CO.,LTD
(http://www.nsfocus.com)

PGP Key: http://www.nsfocus.com/homepage/research/pgpkey.asc
Key fingerprint = F8F2 F5D1 EF74 E08C 02FE 1B90 D7BF 7877 C6A6 F6DA