Zero-day vulnerability in Microsoft Internet Explorer

Use-after-free error

The vulnerability was found exploited in the wild and discovered by Eric Romang.

A real-world attack using the vulnerability first appeared in a blog post in Sep.14, 2012. The vulnerability was used by "Nitro" hacking group.

Vulnerability details

Advisory: SB2012091701 - Remote code execution in Microsoft Internet Explorer

Vulnerable component: Microsoft Internet Explorer

CVE-ID: CVE-2012-4969

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-416 - Use After Free


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to use-after-free error in the CMshtmlEd::Exec function in mshtml.dll. A remote attacker can create a specially crafted Web site, trick the victim into viewing it, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Public Exploits: