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Vulnerability Alert

Microsoft Office Excel MDXTUPLE Record Processing Heap Overflow Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:20037
Version:2
First Published:2010 March 09 18:40 GMT
Last Published:2010 March 10 18:30 GMT
Port: Not available
CVE:CVE-2010-0260
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
Related Resources:
View related IPS Signature
 
 
Version Summary:

Additional technical information that describes the Microsoft Office Excel MDXTUPLE record processing heap overflow vulnerability is available. 

 
 
Description

Microsoft Office Excel contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to errors in processing malformed Excel documents.? An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to view a malicious document.? If the user views the document, the attacker could execute arbitrary code with the privileges of the user.

Microsoft has confirmed this vulnerability in a security bulletin and released software updates.

 
Warning Indicators

The following Microsoft products are affected:

  • Office Excel 2007 SP2 and prior
  • Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP2 and prior
 
IntelliShield Analysis

An attacker cannot directly exploit this vulnerability and instead must rely on user interaction to accomplish an exploit.? The attacker must convince a user to view a malicious document, likely provided as an attachment to an e-mail message delivered to the user.? The attacker may use social engineering techniques to make the user more likely to open a provided document.

If the exploit is successful, the attacker could trigger the execution of arbitrary code with the privileges of the user.? If that user holds elevated privileges, the attacker could gain complete control over the system.? An exploit involving a user with restricted privileges is likely to result in a limited system compromise because any code executed would run in a limited security context.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the March 2010 security bulletin release. This Cisco bulletin, which assists administrators in identifying or mitigating these vulnerabilities using Cisco devices, is available at the following link: Cisco Applied Mitigation Bulletin: Microsoft Security Bulletin Release for March 2010

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS10-017

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the targeted user.? If that user holds elevated privileges, the attacker could execute code resulting in a complete system compromise.

 
Technical Information

This vulnerability is due to insufficient boundary checks on MDXTUPLE records in Microsoft Excel Workbook global streams.  The MDXTUPLE records maintain the metadata required for external data connections.

An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to view a malicious Microsoft Excel document that contains a crafted MDXTUPLE record broken into several overly large records.  Processing the malicious document could cause a heap-based buffer overflow, corrupting memory.  An attacker could take advantage of the memory corruption to execute arbitrary code on the targeted system with the privileges of the user.

 
Safeguards

Administrators are advised to apply the available software updates.

Users are advised not to open unsolicited e-mail attachments. Users should verify that attachments are safe before opening them.

Users are advised to run applications with the least privileges possible.

Users may consider applying the Microsoft Office Isolated Conversion Environment (MOICE) to safely open Excel files from suspicious or unrecognized sources on systems that are running Microsoft Office 2003 or Office 2007.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

 
Patches/Software

Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Windows Update website. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
24559/0Microsoft Excel Memory CorruptionS4762010 Mar 09 
 
Alert History
 

Version 1, March 9, 2010, 1:40 PM: Microsoft Office Excel contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.? Updates are available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Microsoft, Inc.Excel 2007 Base, SP1, SP2
Microsoft, Inc.Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Original Release Base, SP1, SP2

Associated Products:
Microsoft, Inc.Office 2007 Base, SP1, SP2




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