Microsoft Windows contains a vulnerability in the print spooler service that could allow an unauthenticated, remote attacker to execute arbitrary code.
The vulnerability exists due to an error in the Windows print spooler service. An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious request to the targeted system. If successful, the attacker could execute arbitrary code with elevated privileges on the targeted system.
Proof-of-concept code that demonstrates an exploit of this vulnerability is publicly available.
Microsoft has confirmed this vulnerability in a security bulletin and released updated software.
Indicators of Compromise
The following Microsoft systems are affected:
Windows XP SP3 and prior
Windows XP Professional x64 Edition SP2 and prior
Windows Server 2003 SP2 and prior
Windows Server 2003 x64 Edition SP2 and prior
Windows Server 2003 for Itanium-based Systems with SP2 and prior
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 and prior
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for Itanium-based Systems
The vulnerability exists due to an error in the Windows print spooler service. The service fails to properly validate remote procedure call (RPC) requests and improperly determines user permissions. As a result, the service may allow an unauthorized user to print to an arbitrary file location.
An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious RPC request to the targeted system. When processed, the RPC request could allow the attacker to print to an arbitrary file location on the targeted system. As a result, the attacker could place a file in any location on the system, possibly allowing the attacker to execute arbitrary code with elevated privileges.
Only systems with shared printers are vulnerable to remote exploitation of the vulnerability, reducing the number of vulnerable systems in a typical environment.
To exploit the vulnerability, an attacker likely requires access to internal networks, as external RPC requests from untrusted networks will likely be blocked by perimeter filtering devices.
Administrators are advised to apply the available software updates.
Administrators may consider disabling printer sharing.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
Administrators are advised to monitor critical systems.
Microsoft has released a security bulletin at the following link: MS10-061
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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