Vulnerability Alert

Microsoft Office Excel BIFF Record Parsing Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:19323
Version:1
First Published:2009 November 10 18:50 GMT
Last Published:2009 November 10 18:50 GMT
Port: Not available
CVE:CVE-2009-3130
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
 
Version Summary:

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.

 
 
Description

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

This vulnerability exists due to errors in handling malformed BIFF records during the opening of Excel documents.? An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious file.? If the user opens the file, the attacker could execute arbitrary code on the system 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 2002 SP3 and prior
Office 2004 for Mac
Office 2008 for Mac

 
IntelliShield Analysis

In order to exploit this vulnerability, an attacker relies upon user participation.  The attacker must convince a user to view a malicious document, likely delivered as an e-mail attachment or downloaded from a remote website.  Attackers may use social engineering techniques in an attempt to convince the user that the document originates from a trusted source, possibly making users more likely to open a provided document.

If an exploit is successful, the attacker could execute arbitrary code with the privileges of the user.  On systems that grant users elevated privileges, the attacker could execute code resulting in a complete system compromise.  Systems such as Windows Vista or Windows 7 that contain built-in access controls, or systems that only allow users to run programs with limited privileges, are at less risk because any executed code would also run with limited privileges.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the November 2009 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 November 2009

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-067

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the user.? If that user holds Administrator privileges, the attacker could take complete control over the target system.

 
Technical Information

This vulnerability exists due to errors in handling malformed BIFF records during the opening of Excel documents.? An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to open a malicious document with the affected application.? The processing of malicious records within the document could trigger memory corruption that the attacker could leverage to execute arbitrary code 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
22039/0Microsoft Excel Remote Code ExecutionS4962010 Jun 16 
 
Alert History
 

Initial Release



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

Primary Products:
Microsoft, Inc.Excel 2002 (XP) Base, SP1, SP2, SP3
Microsoft, Inc.Office for Mac 2004 Base | 2008 Base

Associated Products:
Microsoft, Inc.Office XP (2002) Base, SP1, SP2, SP3




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
Powered by  IntelliShield