Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.† Updates are available.
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 attempts to access deleted objects.† An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to visit a malicious website, allowing the attacker to execute code on the affected system.
Microsoft has confirmed this vulnerability in a security bulletin and has released updated software.
The following Microsoft products are affected:
Internet Explorer 9 for Windows Vista SP2 and prior
Internet Explorer 9 for Windows Vista x64 Edition SP2 and prior
Internet Explorer 9 for Windows Server 2008 for 32-bit Systems SP2 and prior
Internet Explorer 9 for Windows Server 2008 for x64-based Systems SP2 and prior
Internet Explorer 9 for Windows 7 for 32-bit Systems SP1 and prior
Internet Explorer 9 for Windows 7 for x64 based Systems SP1 and prior
Internet Explorer 9 for Windows Server 2008 R2 for x64-based Systems SP1 and prior
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 with an update that modifies the way Internet Explorer handles objects in memory.
Microsoft has released a security bulletin at the following link: MS12-023
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on a targeted system.† The code would execute in the context of the user who is logged in.† If this user holds administrative privileges, a complete system compromise could occur.
The vulnerability is triggered when vulnerable versions of Internet Explorer attempt to access an object that has been deleted in a way that corrupts memory via the JScript9.dll file.† An attacker could execute arbitrary code on the targeted system.
An unauthenticated, remote attacker who persuades a user to follow a link to a crafted website could exploit this vulnerability to execute arbitrary code on the system.† The attacker may provide a link or embed an ActiveX control that is marked safe for initialization in an application or Office document that uses the Internet Explorer rendering engine.† Successful exploitation could allow arbitrary code execution in the context of the user who is logged in.† If the user holds administrative privileges, a complete system compromise could occur.
Administrators are advised to apply the appropriate updates.
Users should verify that unsolicited links are safe to follow.
Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.
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 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.
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.