BeyondTrust Patch Tuesday
January 12, 2010
Microsoft Patch Disclosure
This month Microsoft released one bulletin which repairs one vulnerability. Both eEye's Blink® Professional and Blink® Personal client security software with anti-virus have protected from client-side memory-corruption vulnerabilities generically without the need for any updates.
The patch released this month is for a single remote code execution vulnerability when handling malformed OpenType Font files embedded within web pages or Microsoft Office documents. Administrators should patch MS10-001 immediately, especially in Windows 2000 environments where the vulnerability is easier to exploit. As always, eEye suggests that users roll out Microsoft patches as fast as possible, preferably after testing the impact on internal applications and network continuity. For those who would like further information regarding the potential risks and remediation requirements of the patches announced today, please consider attending tomorrow's Vulnerability Expert Forum hosted by the eEye Security Research Team.
BULLETIN / ADVISORY DETAILS
Vulnerability in the Embedded OpenType Font Engine Could Allow Remote Code Execution (972270)
Attackers are likely to exploit this vulnerability using client side attacks by setting up malicious web servers and distributing trojanized Office documents to targeted individuals. Attackers will focus on targets that are known to be using Windows 2000 machines. This can be done programmatically by detecting browser versions or Microsoft Office versions via web requests and then delivering the exploit to suitable targets. Successful exploitation will result in arbitrary code execution in the context of the current user. Administrators are advised to patch all versions of Windows, however Windows 2000 should be patched initially with all other versions following suit.
Disable support for parsing embedded fonts within Internet Explorer using the Internet Options\Security\Internet\Font Downloading options under the Tools menu item or disable execute permissions to T2EMBED.DLL using CACLS. Any application or website that requires embedded font types may be not function properly after these mitigation tactics, so administrators are advised to test applications prior to performing these actions.
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