Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a vulnerable system.
The vulnerability is due to errors when Internet Explorer accesses deleted objects.† An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on a vulnerable system by enticing a user to visit a crafted website.
Microsoft has confirmed this vulnerability in a security bulletin and has released updated software.
Indicators of Compromise
The following Microsoft products are affected:
Internet Explorer 6 for Windows XP SP3 and prior
Internet Explorer 6 for Windows XP Professional x64 Edition SP2 and prior
Internet Explorer 6 for Windows Server 2003 SP2 or prior
Internet Explorer 6 for Windows Server 2003 x64 Edition SP2 and prior
Internet Explorer 6 for Windows Server 2003 for Itanium-based Systems SP2 and prior
Internet Explorer 7 for Windows XP SP3 or prior
Internet Explorer 7 for Windows XP Professional x64 Edition SP2 and prior
Internet Explorer 7 for Windows Server 2003 SP2 and prior
Internet Explorer 7 for Windows Server 2003 for Itanium-based Systems SP2 and prior
Internet Explorer 7 for Windows Vista SP2 and prior
Internet Explorer 7 for Windows Vista x64 Edition SP2 and prior
Internet Explorer 7 for Windows Server 2008 for 32-bit Systems SP2 and prior
Internet Explorer 7 for Windows Server 2008 for x64-based Systems SP2 and prior
Internet Explorer 7 for Windows Server 2008 for Itanium-based Systems SP2 and prior
An unauthenticated, remote attacker could exploit this vulnerability by convincing a targeted user to open a malicious web page. Processing such web pages could cause the application to use the object reference to execute arbitrary code on the targeted system.
To exploit the vulnerability, the attacker may provide a file or a link to a malicious website and use misleading language or instructions to persuade the user to open the file or follow the provided link.
Microsoft has corrected this vulnerability by modifying the way Internet Explorer handles objects in memory.
Administrators are advised to apply the appropriate updates.
Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.
Users should verify that unsolicited links are safe to follow.
Administrators are advised to monitor affected 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 has released a security bulletin at the following link: MS12-023
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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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.