Microsoft Internet Information Services FTP service contains a vulnerability that could allow an authenticated, remote attacker to access sensitive information. Updates are available.
Microsoft Internet Information Services (IIS) FTP service contains a vulnerability that could allow an authenticated, remote attacker to access sensitive information on a targeted system.
The vulnerability exists because the affected software improperly handles crafted FTP commands. An authenticated, remote attacker could exploit this vulnerability by issuing a crafted FTP command to the system. If successful, the attacker could inject a limited set of FTP commands into the session and access sensitive information. The attacker could use this information to launch additional attacks.
Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
Microsoft FTP Service 7.0 and 7.5 for IIS 7.0 are affected when installed on the following:
Windows Vista and Vista x64 Edition SP2
Windows Server 2008 (32-bit and 64-bit) SP2
Microsoft Internet Information Services 7.5 is affected when installed on the following:
Windows 7 (32-bit and 64-bit) SP1 and prior
Windows Server 2008 R2 (64-bit and Itanium) SP1 and prior
To exploit this vulnerability, the attacker must have account access. No further authentication is required. Because attackers require account access, trusted users with limited privileges may use this type of vulnerability as part of an insider attack.
Microsoft has corrected this vulnerability by modifying the way the IIS FTP service handles crafted FTP commands.
Microsoft has released a security bulletin at the following link: MS12-073
An authenticated, remote attacker could exploit this vulnerability to gain unauthorized access to sensitive information. This information could be used to launch additional attacks.
The vulnerability exists because the affected software improperly handles crafted FTP commands.
An authenticated, remote attacker could exploit this vulnerability by issuing a crafted FTP command to the system. When the malicious command is processed by the affected software, the attacker may be able to inject a limited set of FTP commands to the targeted system before the session switches to Transport Layer Security (TLS). A successful exploit could allow the attacker to access sensitive information. The attacker could use this information to launch additional attacks.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to monitor critical systems.
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 Microsoft Update service. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.
The security vulnerability applies to the following combinations of products.
Internet Information Services (IIS)
7.0 Base | 7.5 Base
for 32-bit systems SP1 | for x64-based systems Base, SP1
Windows Server 2008
Datacenter Edition SP2 | Datacenter Edition, 64-bit SP2 | Enterprise Edition SP2 | Enterprise Edition, 64-bit SP2 | Essential Business Server Premium SP2 | Essential Business Server Premium, 64-bit SP2 | Essential Business Server Standard SP2 | Standard Edition SP2 | Standard Edition, 64-bit SP2 | Web Server SP2 | Web Server, 64-bit SP2
Windows Server 2008 R2
Itanium-Based Systems Edition Base, SP1 | x64-Based Systems Edition Base, SP1
Business SP2 | Business x64 Edition SP2 | Enterprise SP2 | Enterprise x64 Edition SP2 | Home Basic SP2 | Home Basic x64 Edition SP2 | Home Premium SP2 | Home Premium x64 Edition SP2 | Ultimate SP2 | Ultimate x64 Edition SP2
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