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Vulnerability Alert

Microsoft Office Excel Memory Corruption Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:30574
Version:1
First Published:2013 September 10 17:27 GMT
Last Published:2013 September 10 17:27 GMT
Port: Not available
CVE:CVE-2013-1315
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 on a targeted system. Updates are available.
 
 
Description
Microsoft Office Excel contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.

The vulnerability is due to improper parsing of content in Microsoft Office Excel documents. An unauthenticated, remote attacker could exploit this vulnerability by convincing a targeted user to view a malicious document. If successful, the attacker could exploit 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 software is affected:
  • Microsoft Excel 2003 SP3 and prior
  • Microsoft Excel 2007 SP3 and prior
  • Microsoft Excel 2010 32-bit and 64-bit Editions SP2 and prior
  • Microsoft Excel 2013 32-bit and 64-bit Editions
  • Microsoft Excel 2013 RT
  • Microsoft Office for Mac 2011
  • Microsoft Excel Viewer
  • Microsoft Office Compatibility Pack SP3
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a file to the user and persuade the user to open or execute the file by using misleading language or instructions.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the September 2013 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 September 2013
 
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS13-073
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on a targeted system with the privileges of a targeted user. If the user holds elevated privileges, the attacker could completely compromise the system.
 
Technical Information
The vulnerability is due to improper parsing of content in Microsoft Office Excel documents.

An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to open a malicious Office Excel document. The processing of content in the document could trigger memory corruption that the attacker could use to execute arbitrary code on the system with the privileges of the user.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.

Administrators are advised to monitor affected systems.

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 Microsoft Update service. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.
 
Alert History
 
Initial Release


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

Primary Products:
Microsoft, Inc.Excel 2003 Base, SP1, SP2, SP3 | 2007 Base, SP1, SP2, SP3 | 2010 (32-bit edition) Base, SP1 | 2010 (64-bit edition) Base, SP1 | 2013 (32-bit edition) Base | 2013 (64-bit edition) Base | 2013 RT Base
Microsoft, Inc.Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Original Release SP3
Microsoft, Inc.Office for Mac 2011 Base

Associated Products:
Microsoft, Inc.Office 2003 Base, SP1, SP2, SP3 | 2007 Base, SP1, SP2, SP3 | 2010 Base, SP1, SP2 | 2013 32-bit editions, 64-bit editions




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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.
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