Microsoft Data Access Components contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.
The vulnerability is due to invalid memory operations performed by the affected software when processing malformed web pages. An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website. If successful, the attacker could execute arbitrary code with the privileges of the user.
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 software updates.
Indicators of Compromise
Microsoft Data Access Components versions 2.8 SP2 and prior and 6.0 are affected when running on the following systems:
Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 for Itanium-based Systems Service Pack 2
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2
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
The vulnerability is due to improper memory operations performed by the Microsoft ActiveX Data Objects (MSADO) component used by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a website that is designed to pass overly large CacheSize property values to the vulnerable control. The processing of the values could cause the ActiveX control to miscalculate a buffer size using the user-supplied value. When the application later copies content into an insufficiently sized buffer, memory corruption may occur. The attacker could use the memory corruption to execute arbitrary code with the privileges of the user.
An attacker could not directly exploit this vulnerability and instead relies on user interaction to accomplish an exploit. The attacker must convince a user to view a malicious website, likely by supplying links to malicious sites in e-mail or instant messages to the user. When followed, the link could direct the user to a malicious site and trigger the vulnerability.
Administrators are advised to apply the available software updates.
Administrators may consider disabling the ActiveX Data Objects msado15.dll library.
Administrators may consider configuring Internet Explorer to prompt users before running Active Scripting or ActiveX controls by setting the Internet and Local Intranet security zone settings to High. Alternately, administrators could disable Active Scripting and ActiveX controls in these security zones.
Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.
Users are advised not to open unsolicited e-mail attachments. Users should verify that attachments are safe before opening them.
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 are advised to monitor critical systems.
Microsoft has released a security bulletin at the following link: MS11-002
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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