Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on the targeted system.
The vulnerability is due to invalid memory operations performed on uninitialized memory objects. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to view a malicious website. If successful, the attacker could execute arbitrary code on the system with the privileges of the user.
Microsoft confirmed this vulnerability in a security bulletin and released software updates.
Indicators of Compromise
Internet Explorer versions 6 and 7 are vulnerable when running on the following Microsoft systems:
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 Itanium-based Edition SP2 and prior
Windows Vista SP2 and prior
Windows Vista x64 Edition SP2 and prior
The vulnerability is due to invalid memory operations performed on uninitialized memory objects. A particular object is created having multiple references while instantiating multiple ActiveX controls.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to visit a web page designed to free the vulnerable object and its references. The attacker could access the object in the intitialized memory by means of an incorrect reference, which could allow the attacker to execute arbitrary code on the targeted system with the privileges of the user.
To exploit the vulnerability, the attacker must convince a user to view a malicious website. Attackers may provide links that direct users to malicious sites and use misleading language or instructions to make the user more interested in following the provided link. If an exploit is successful, the attacker could trigger the execution of arbitrary code on the system with the privileges of the user.
Administrators are advised to apply the available software updates.
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 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.
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: MS10-090
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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