July 13, 2009
Microsoft Office Web Components is prone to a remote code-execution vulnerability that affects the OWC10.Spreadsheet ActiveX control. The control is identified by the following CLSIDs: 0002E541-0000-0000-C000-000000000046 0002E559-0000-0000-C000-000000000046 An attacker could exploit this issue by enticing a victim to visit a maliciously crafted site. Successfully exploiting this issue would allow the attacker to execute arbitrary code in the context of the currently logged-in user.
- Microsoft Internet Security and Acceleration Server 2004 Enterprise Editio SP3
- Microsoft Internet Security and Acceleration Server 2004 Standard Edition SP3
- Microsoft Internet Security and Acceleration Server 2006
- Microsoft Internet Security and Acceleration Server 2006 SP1
- Microsoft Internet Security and Acceleration Server 2006 Supportability Up
- Microsoft Microsoft Office Small Business Accounting 2006
- Microsoft Office 2003
- Microsoft Office 2003 SP1
- Microsoft Office 2003 SP2
- Microsoft Office 2003 SP3
- Microsoft Office 2003 Web Components SP3
- Microsoft Office 2003 Web Components for Office 2007 SP1
- Microsoft Office XP
- Microsoft Office XP SP1
- Microsoft Office XP SP2
- Microsoft Office XP SP3
- Microsoft Office XP Web Components SP3
Run all software as a nonprivileged user with minimal access rights.
To mitigate the impact of a successful exploit, run the affected application as a user with minimal access rights.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of suspicious or anomalous activity. This may help detect malicious actions that an attacker may take after successfully exploiting vulnerabilities in applications. Review all applicable logs regularly.
Do not follow links provided by unknown or untrusted sources.
Never accept files or follow links from untrusted or unknown sources, because they may be malicious in nature.
The vendor has released an advisory and fixes. Please see the references for details.
- Microsoft - Microsoft Homepage
- Microsoft - Microsoft Knowledge Base Article 240797
- Fortinet - Microsoft Office Web Components Memory Corruption Vulnerability
- Microsoft - Microsoft Security Advisory 973472 Released
- Fermin J. Serna - More information about the Office Web Components ActiveX vulnerability
Haifei Li of Fortinet's FortiGuard Global Security Research Team and Peter Vreugdenhil of Zero Day Initiative
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