Additional technical information is available for the Microsoft Internet Explorer GetMarkupPtr function use-after-free vulnerability.
Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.
The vulnerability is due to improper memory operations performed by Internet Explorer. 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 targeted system with the privileges of the targeted user.
Microsoft confirmed the vulnerability in a security bulletin and released software updates.
Microsoft Internet Explorer 6, 7, 8, 9, and 10 are vulnerable when running on the following systems:
Windows XP SP3 and Professional x64 Edition SP2
Windows Server 2003, x64 Edition and Itanium-based Systems SP2
Windows Vista and x64 Edition SP2
Windows Server 2008 for 32-bit, x64-based Systems and Itanium-based Systems SP2
Windows 7 for 32-bit and x64-based Systems SP1 and prior
Windows Server 2008 R2 for x64-based and Itanium-based Systems SP1 and prior
Windows 8 for 32-bit and 64-bit Systems
Windows Server 2012
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.
Microsoft has corrected this vulnerability by modifying the way that Internet Explorer handles objects in memory.
Microsoft has released a security bulletin at the following link: MS13-021
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on the targeted system with the privileges of the targeted user. If that user holds elevated privileges, the attacker could completely compromise the targeted system.
The vulnerability is due to the improper handling of user-supplied input by the GetMarkupPtr function while processing objects in memory. The vulnerability exists within the execCommand print event, which can be leveraged by an attacker to manipulate a document's elements by forcing a pointer to be reused after it has been freed, resulting in a use-after-free error that could corrupt memory.
An unauthenticated, remote attacker could exploit this vulnerability by convincing a targeted user to view a malicious website within Internet Explorer. When processed, malicious content within the website could cause Internet Explorer to free previously removed or uninitialized memory objects, resulting in a use-after-free condition. The attacker could leverage memory corruption resulting from the use-after-free to execute arbitrary code on the targeted system with the privileges of the targeted user.
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.
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 affected 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.
Datacenter Edition SP2 | Datacenter Edition, 64-bit SP2 | Itanium-Based Systems Edition SP2 | Enterprise Edition SP2 | Enterprise Edition, 64-bit SP2 | Essential Business Server Standard SP2 | Essential Business Server Premium SP2 | Essential Business Server Premium, 64-bit SP2 | Standard Edition SP2 | Standard Edition, 64-bit SP2 | Web Server SP2 | Web Server, 64-bit SP2
Windows Server 2008 R2
x64-Based Systems Edition Base, SP1 | Itanium-Based Systems Edition Base, SP1
Windows Server 2012
Original Release Base
Home Basic SP2 | Home Premium SP2 | Business SP2 | Enterprise SP2 | Ultimate SP2 | Home Basic x64 Edition SP2 | Home Premium x64 Edition SP2 | Business x64 Edition SP2 | Enterprise x64 Edition SP2 | Ultimate x64 Edition SP2
Home Edition SP3 | Professional Edition SP3 | Professional x64 (AMD/EM64T) SP2 | Tablet PC Edition SP3 | Media Center Edition SP3
for 32-bit systems Base | for x64-based systems Base
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