Microsoft Internet Explorer 8 CMarkup use-after-free vulnerability

Overview

Microsoft Internet Explorer 8 contains a use-after-free vulnerability, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

Description

Microsoft Internet Explorer 8 contains a use-after-free vulnerability. This can allow for arbitrary code execution. Additional details may be found in the Zero Day Initiative advisory ZDI-14-140.

Impact

By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code.

Solution

Apply an Update Users should upgrade to Internet Explorer 11.  Users that are unable to upgrade past Internet Explorer 8 should consider the following workarounds. Windows XP users will not be able to upgrade past Internet Explorer 8.

Use the Microsoft Enhanced Mitigation Experience Toolkit The Microsoft Enhanced Mitigation Experience Toolkit (EMET) can be used to help prevent exploitation of this vulnerability. Note that platforms that do not support ASLR, such as Windows XP and Windows Server 2003, will not receive the same level of protection that modern Windows platforms will. Disable ActiveX and Active Scripting Set the Internet security zone setting to "High" to block ActiveX Controls and Active Scripting.

Vendor Information (Learn More)

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Affected	-	21 May 2014

If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group	Score	Vector
Base	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
Temporal	6.5	E:H/RL:W/RC:C
Environmental	8.2	CDP:MH/TD:H/CR:H/IR:H/AR:L

References

• http://zerodayinitiative.com/advisories/ZDI-14-140/
• https://www.corelan.be/index.php/2014/05/22/on-cve-2014-1770-zdi-14-140-internet-explorer-8-0day/

Credit

This vulnerability was discovered by Peter 'corelanc0d3r' Van Eeckhoutte and coordinated by the Zero Day Initiative.

This document was written by Jared Allar.

Other Information

• CVE IDs: CVE-2014-1770
• Date Public: 21 5월 2014
• Date First Published: 21 5월 2014
• Date Last Updated: 22 5월 2014
• Document Revision: 9