Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.
The vulnerability is due to improper memory operations when processing malformed web content. An unauthenticated, remote attacker could exploit this vulnerability by convincing a targeted user to view a malicious website. If successful, the attacker could execute arbitrary code on the system.
Functional code that demonstrates an exploit of this vulnerability is publicly available.
Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
Indicators of Compromise
Microsoft Internet Explorer versions 6, 7, 8, 9, 10, and 11 are vulnerable when running on the following 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 with SP2 and prior for Itanium-based Systems
Windows Vista SP2 and prior
Windows Vista x64 Edition SP2 and prior
Windows Server 2008 for 32-bit Systems SP2 and prior
Windows Server 2008 for x64-based Systems SP2 and prior
Windows Server 2008 for Itanium-based Systems SP2 and prior
Windows 7 for 32-bit Systems SP1 and prior
Windows 7 for x64-based Systems SP1 and prior
Windows Server 2008 R2 for x64-based Systems SP1 and prior
Windows Server 2008 R2 for Itanium-based Systems SP1 and prior
Windows 8 for 32-bit Systems
Windows 8 for 64-bit Systems
Windows Server 2012
Windows 8.1 for 32-bit Systems
Windows 8.1 for 64-bit Systems
Windows Server 2012 R2
Windows RT 9.1
The vulnerability exists due to a use-after-free memory access error while handling a CDisplayPointer object when invoked by the onpropertychange event handler.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to visit a malicious webpage crafted with a CBlockElement and a CTextArea element to trigger an onpropertychange event. Handling this event could free the CDisplayPointer object, however it remain accessible via the CDoc::ScrollPointerIntoView property and could cause a memory corruption if the freed object is accessed. The memory corruption could allow the attacker to cause a DoS condition or execute arbitrary code.
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link.
Administrators are advised to apply the appropriate updates.
Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.
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: MS13-080
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.
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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.