Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with elevated privileges.
The vulnerability is due to improper handling of requests responses that are returned from a Server Message Block (SMB) server to the Windows SMB Client. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to access a malicious SMB server. If successful, the attacker could execute arbitrary code with the privileges of the SMB Client.
Microsoft confirmed this vulnerability in a security bulletin and released updated software.
Indicators of Compromise
The following Microsoft systems are affected:
Windows Server 2003 SP2 and prior
Windows Server 2003 x64 Edition SP2 and prior
Windows Server 2003 with SP2 and prior for Itanium-based Systems
Windows Vista SP2 and prior
Windows Vista x64 Edition SP2 and prior
Windows Server 2008 for 32-bit Systems SP2 and prior
Windows Server 2008 for x64-based Systems SP2 and prior
Windows Server 2008 for Itanium-based Systems SP2 and prior
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for Itanium-based Systems
This vulnerability is due to improper handling of requests responses that are returned from an SMB server to the Windows SMB Client.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to access a malicious SMB server. Responses that are returned from the server and processed by the SMB Client could trigger memory corruption. The attacker could make use of the memory corruption to execute arbitrary code with the privileges of the Windows SMB Client.
To exploit the vulnerability, an attacker must convince a user to access a malicious SMB server. The attacker may provide links to the user in e-mail messages and use social engineering tactics to make users more likely to follow a provided link. The attacker must also place the server in a network that is accessible to the targeted user, possibly increasing the difficulty of achieving an exploit.
Administrators are advised to apply the available software updates.
Administrators may consider blocking TCP ports 139 and 445 at host-based firewalls.
Users should verify that unsolicited links are safe to follow.
Administrators are advised to monitor critical systems.
Microsoft has released a security bulletin available at the following link: MS10-020
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.
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