FortiGuard Advisory (FGA-2007-07)

Arbitrary File Rewrite Vulnerability in Microsoft Internet Explorer
2007.May.09

Fortinet Global Security Research Team Discovers An Arbitrary File Rewrite Vulnerability Affecting Microsoft Internet Explorer.

Summary:

A Remote Vulnerability exists in Internet Explorer which could allow an attacker to rewrite an arbitrary file on an affected system.

Risk:

  • Critical

Affected Software:

  • Microsoft Windows 2000 Service Pack 4
  • Microsoft Windows XP Service Pack 2
  • Microsoft Windows XP Professional x64 Edition and Windows XP Professional x64 Edition Service Pack 2
  • Microsoft Windows Server 2003 Service Pack 1 and Microsoft Windows Server 2003 Service Pack 2
  • Microsoft Windows Server 2003 with SP1 for Itanium-based Systems and Microsoft Windows Server 2003 with SP2 for Itanium-based Systems
  • Microsoft Windows Server 2003 x64 Edition Service Pack 1 and Microsoft Windows Server 2003 x64 Edition Service Pack 2
  • Windows Vista
  • Windows Vista x64 Edition

Additional Information:

A remote attacker could compromise a web site or host a malicious web page that is used to exploit this vulnerability. When a user is enticed to view the page through links from webpages, emails, or instant messages and they have the vulnerable media service component ( mdsauth.dll ), an arbitrary pre-existing file can be rewritten. This can lead remote code execution and allow full control of the affected system.

This vulnerability is due to improper sanitization of remotely supplied data.

Solution:

  • Install updates provided by Microsoft included in (MS07-027)

Credits:

  • Fortinet Global Security Research Team

References:



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About Fortinet ( www.fortinet.com ):

Fortinet is the pioneer and leading provider of ASIC-accelerated unified threat management, or UTM, security systems, which are used by enterprises and service providers to increase their security while reducing total operating costs. Fortinet solutions were built from the ground up to integrate multiple levels of security protection--including firewall, antivirus, intrusion prevention, VPN, spyware prevention and anti-spam -- designed to help customers protect against network and content level threats. Leveraging a custom ASIC and unified interface, Fortinet solutions offer advanced security functionality that scales from remote office to chassis-based solutions with integrated management and reporting. Fortinet solutions have won multiple awards around the world and are the only security products that are certified in six programs by ICSA Labs: (Firewall, Antivirus, IPSec, SSL, Network IPS, and Anti-Spyware). Fortinet is privately held and based in Sunnyvale, California.