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Windows Security Updates Fix Critical issues
Severity: High
10 November, 2009
§ These vulnerabilities affect: All current versions of Windows and the components that ship with it.
§ How an attacker exploits them: Multiple vectors of attack, including sending a specially crafted packet, or running a malicious program
§ Impact: Various results; in the worst case, an attacker can gain complete control of your Windows computer
§ What to do: Install the appropriate Microsoft patches immediately, or let Windows Automatic Update do it for you.
Today, Microsoft released four security bulletins describing five vulnerabilities that affect Windows and components that ship with it. Each vulnerability affects different versions of Windows to varying degrees. However, a remote attacker could exploit the worst of these flaws to gain complete control of your Windows PC. The summary below lists the vulnerabilities, in order from highest to lowest severity.
§ MS09-063: WSD Memory Corruption Vulnerability
Web Services on Devices (WSD) is a component that helps Windows clients discover and access remote devices across a network (devices such as PDAs, cameras, smart phones, etc). WSD ships with Windows Vista and Server 2008. WSD suffers from a memory corruption flaw involving its inability to properly parse specially crafted WSD messages. By sending a malicious WSD message to a vulnerable Windows machine, an attacker could exploit this flaw to execute code on that user's computer, with that user's privileges. If your user has local administrative privileges, the attacker would gain complete control of the user's computer. However, the Windows firewall only allows WSD connections from your local network. Furthermore, a network firewall-- such as a WatchGuard Firebox -- also blocks the WSD ports by default (TCP ports 5357 and 5358). So this vulnerability primarily poses an internal risk.
Microsoft rating: Critical.
§ MS09-064: Win2K LLS Buffer Overflow Vulnerabilities
The License Logging Server (LLS) is a tool that helps administrators manage licenses for Microsoft server products that are licensed in the Server Client Access License (CAL) model. LLS ships with older Server versions of Windows. However, this particular flaw only affects LLS on Windows 2000 servers. LLS suffers from a buffer overflow involving its inability to properly validate the length of a parameter in a specially crafted RPC message. By sending a specially crafted RPC message, an attacker could leverage this vulnerability to gain complete control of your Windows computers. However, most administrators do not allow RPC traffic through their firewall. Therefore, these vulnerabilities primarily pose an internal risk. Again, this flaw only affects Windows 2000 servers.
Microsoft rating: Critical.
§ MS09-065: Three Windows Kernel Vulnerabilities
The Windows kernel suffers from two elevation of privilege (EoP) vulnerabilities and a code execution vulnerability. All three of the flaws differ technically, but share a similar impact. By running a specially crafted program on one of your Windows computers, or by enticing one of your users to view content rendered with a specially crafted EOT font, an attacker can gain complete control of that Windows system. With two of these flaws, the attacker needs to have local access to one of your computers in order to run his malicious application. So those two vulnerabilities primarily pose an internal risk. However, a remote hacker could entice one of your users to view content containing a special font. So that particular kernel vulnerability poses the most severe risk.
Microsoft rating: Critical.
§ MS09-066: Active Directory DoS Vulnerability
Active Directory (AD) provides central authentication and authorization services for Windows computers and ships with most recent server versions of Windows. AD suffers from a Denial of Service (DoS) vulnerability due to its inability to properly parse certain LDAP or LDAPS messages. By sending your AD service a specially crafted LDAP or LDAPS packet, an attacker could cause the server to stop responding. You'd have to reboot your AD server before your users could resume authentication. However, most administrators do not allow LDAP traffic through their firewall. Therefore, this vulnerability primarily poses an internal risk.
Microsoft rating: Important. 
Solution Path:
Microsoft has released patches for Windows which correct all of these vulnerabilities. You should download, test, and deploy the appropriate patches throughout your network immediately.
§ Windows Server 2003
§ Windows Server 2003 x64
Note: These vulnerabilities do not affect any other versions of Windows
Microsoft has released patches correcting these issues.
§ Microsoft Security Bulletin MS09-063
§ Microsoft Security Bulletin MS09-064
§ Microsoft Security Bulletin MS09-065
§ Microsoft Security Bulletin MS09-066


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