Just when you thought we were out of the woods, Internet Explorer 0day shows up, in the wild. Here’s what you need to know about the vulnerability:
- Internet Explorer 6, 7, 8, and 9 are vulnerable (UPDATE: Out-of-band patch available now!)
- Use-after-free when the CMshtmlEd object is deleted and then the same area in memory is used by CMshtmlEd::Exec()
- Payload delivered via heap spray
- Malicious website hosts exploit.html and determines if target is running IE 7 or IE 8
- exploit.html loads Moh2010.swf, which then performs a heap spray and loads an iframe
- Protect.html is loaded and triggers the vulnerability
- Poison Ivy is then downloaded (111.exe)
- C:WINDOWSsystem32mspmsnsv.dll
- WmdmPmSN service
The Metasploit module is reliable for IE 7 and IE 8 in Windows XP, but requires the Java Runtime Environment (JRE6 only, the module does not work with JRE7) for exploitation of IE 8 and IE 9 in Windows 7.
Blink and Retina Protection Agent have been verified to succesfully prevent exploitation of this vulnerability through its Application Protection functionality. Additionally, EMET 3.0 helps mitigate exploitation of this vulnerability.
You can detect vulnerable systems using Retina and Retina CS, via the following audit:
17089 - Microsoft Internet Explorer CMshtmlEd::Exec() Code Execution (Zero-Day)
[caption id="attachment_10581" align="aligncenter" width="640"] Screenshot of Retina CS Audit 17089[/caption]
Scott Lang, Sr. Director, Product Marketing at BeyondTrust
Scott Lang has nearly 20 years of experience in technology product marketing, currently guiding the product marketing strategy for BeyondTrust’s privileged account management solutions and vulnerability management solutions. Prior to joining BeyondTrust, Scott was director of security solution marketing at Dell, formerly Quest Software, where he was responsible for global security campaigns, product marketing for identity and access management and Windows server management.
