Microsoft Windows contains a vulnerability that could allow a local attacker to gain escalated privileges.† Updates are available.
Microsoft Windows contains a vulnerability that could allow a local attacker to gain escalated privileges.
This vulnerability is due to insufficient data checks on input to the Microsoft Message Queuing (MSMQ) service. A local attacker could exploit this vulnerability by causing a malicious program to send specially formed requests to the Windows kernel. A successful exploit could allow the attacker to execute arbitrary code with elevated privileges.
Microsoft has confirmed this vulnerability in a security bulletin and released software updates.
The following Microsoft systems are affected:
Windows 2000 SP4 and prior
Windows XP SP2 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 SP2 and prior
Windows Vista x64 Edition
Attackers must log in locally to an affected system to exploit this vulnerability, which reduces the source of potential attacks. Systems most at risk are multi-user workstations, terminal services, or hosting providers with large user bases that may allow unknown or untrusted user access. If an exploit is successful, the attacker could execute arbitrary code, possibly resulting in a complete system compromise.
The update available from Microsoft corrects this vulnerability by validating data within IOCTLs.
Microsoft has released a security bulletin at the following link: MS09-040
A local attacker could exploit this vulnerability to execute arbitrary code with the privileges of the Windows kernel. An exploit could allow the attacker to gain escalated privileges and take complete control over the vulnerable system.
This vulnerability is due to insufficient data checks on input to the MSMQ service. Vulnerable systems fail to properly validate data within input/output controls (IOCTLs) that are sent to the Windows kernel. The processing of malformed data could trigger memory corruption within the Windows kernel.
A local attacker could exploit this vulnerability by running a program that is designed to send malicious IOCTLs to the vulnerable system, resulting in memory corruption. The attacker could leverage this corruption to execute arbitrary code with the privileges of the Windows kernel, allowing the attacker to gain elevated privileges.
Administrators are advised to apply the applicable software updates.
Administrators are advised to restrict local access to trusted users.
Administrators are advised to monitor critical systems.
Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.
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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