Effective 2019 Sep 15, Cisco will no longer publish non-Cisco product alerts. Cisco will continue to publish Security Advisories to address third-party software vulnerabilities per the Cisco Security Vulnerability Policy.
Multivendor Vulnerability Alert
Microsoft Internet Explorer Memory Corruption Vulnerability
Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.
The vulnerability is due to improper processing of malformed content in web pages. An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website. If successful, the attacker could execute arbitrary code with the privileges of the user.
Microsoft has confirmed the vulnerability in a security advisory and released software updates.
Indicators of Compromise
Internet Explorer versions 6, 7, and 8 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 for Itanium-based Systems SP2 and prior
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
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for Itanium-based Systems
The vulnerability is due to improper processing of malformed content in web pages. The processing of malformed HTML content could cause Internet Explorer to reference uninitialized or previously removed memory objects, resulting in memory corruption.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to view a malicious website. If viewed by the user, the website could cause Internet Explorer to perform improper memory operations, corrupting memory. The attacker could use the memory corruption to execute arbitrary code with the privileges of the user.
To exploit the vulnerability, an attacker must convince a user to view a malicious website. Attackers may use social engineering tactics to accomplish this goal by delivering links to users in e-mail messages. An attacker may also attempt to make a user more interested in following a provided link by making the user believe that the source of the link is trusted or that the website contains content that is interesting or relevant to the user.
If an exploit is successful, the attacker could execute arbitrary code on the system with the privileges of the user. If that user holds elevated privileges, an exploit may result in complete system compromise.
Administrators are advised to apply the appropriate updates.
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.
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 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: MS11-003
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.