This security update resolves vulnerabilities in Internet Explorer. The most severe of the vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.
- Internet Explorer 11
- Internet Explorer 10
- Internet Explorer 9
- Internet Explorer 8
- Internet Explorer 7
- Internet Explorer 6
The security update addresses the vulnerabilities by:
- Modifying how Internet Explorer, VBScript, and JScript handle objects in memory
- Helping to ensure that affected versions of Internet Explorer properly implement the CFG security feature
- Preventing the XSS filter in Internet Explorer from incorrectly disabling HTML attributes
- Adding additional permission validations to Internet Explorer
- Helping to ensure that affected versions of Internet Explorer properly implement the Address Space Layout Randomization (ASLR) security feature
- Helping to ensure cross-domain policies are properly enforced in Internet Explorer
- Helping to restrict what information is returned to external style sheets
- Helping to ensure that file paths are properly validated before returning file data to the user
- Helping to ensure that requests for module resources are properly validated in Internet Explorer
These vulnerabilities could allow remote code execution or an elevation of privilege if a user views a specially crafted webpage in Internet Explorer. An attacker who successfully exploits this vulnerability could gain the same user rights as the current user. Depending on the privileges associated with the user, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights.
We recommend the following actions be taken:
- After appropriate testing, apply appropriate patches provided by Microsoft to vulnerable systems.
- Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
- Remind users not to visit untrusted websites or follow links provided by unknown or untrusted sources.
Do not open email attachments from unknown or untrusted sources or suspicious emails from trusted sources.