Microsoft Office Excel contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code. Updates are available.
Microsoft Office Excel contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.
This vulnerability is due to improper validation of malformed chart sheet substreams by Microsoft Excel.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to view a malicious Excel file. If successful, 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.
The following Microsoft products are affected:
Office Excel 2002 SP3 and prior
Office Excel 2003 SP3 and prior
Office Excel 2007 SP2 and prior
Office Word 2007 SP2 and prior
Office 2004 for Mac
Office 2008 for Mac
Open XML File Format Converter for Mac
Office Excel Viewer SP2 and prior
Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP2 and prior
An attacker will rely on user interaction to accomplish an exploit. The attacker must convince a user to open a malicious document designed to trigger the vulnerability. Attackers may provide documents to users as e-mail attachments or as posts on public websites.
Microsoft has released a security bulletin at the following link: MS10-038
An unauthenticated, remote attacker could exploit the vulnerability to execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could execute arbitrary code that results in a complete system compromise.
The vulnerability is due to improper validation of malformed chart sheet substreams by Microsoft Excel.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to view a malicious document. When processed, the document could trigger memory corruption that the attacker could make use of to execute arbitrary code with the privileges of the user.
Administrators are advised to apply the appropriate updates.
Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.
Users are advised to run applications with the least necessary privileges.
Users may consider applying the Microsoft Office Isolated Conversion Environment (MOICE) to safely open Word, Excel, and PowerPoint 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.
Administrators are advised to monitor critical systems.
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.
Cisco Systems Cisco Intrusion Prevention System (IPS) 6.0
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.