Microsoft Security Bulletin MS13-021 – CriticalThis security update resolves eight privately reported vulnerabilities and one publicly disclosed vulnerability in Internet Explorer. The most severe vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
This security update is rated Critical for Internet Explorer 6, Internet Explorer 7, Internet Explorer 8, Internet Explorer 9, and Internet Explorer 10 on Windows clients and Moderate for Internet Explorer 6, Internet Explorer 7, Internet Explorer 8, Internet Explorer 9, and Internet Explorer 10 on Windows servers. For more information, see the full bulletin.
Recommendation. Most customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.
For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update immediately using update management software, or by checking for updates using the Microsoft Update service.
Microsoft Security Advisory (2755801)
Today we also released an update that addresses vulnerabilities in Adobe Flash Player in Internet Explorer 10 on Windows 8. The details of the vulnerabilities are documented in Adobe security bulletin APSB13-09. The majority of customers have automatic updates enabled and will not need to take any action because the update will be downloaded and installed automatically. For those manually updating, we encourage you to read the advisory and apply this update as quickly as possible.
This update addresses the vulnerabilities in Adobe Flash Player by updating the affected Adobe Flash binaries contained within Internet Explorer 10. For more information, see the advisory.
— Tyson Storey, Program Manager, Internet Explorer