Zero-day vulnerability in Windows

Arbitrary code execution
CVE-2016-3393

The vulnerability has been used by an APT group Kaspersky Lab call FruityArmor. Victims have been identified in Thailand, Iran, Algeria, Yemen, Saudi Arabia and Sweden.

Vulnerability details

Advisory: SB2016101102 - Multiple vulnerabilities in Microsoft Windows

Vulnerable component: Windows

CVE-ID: CVE-2016-3393

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

CWE-ID: CWE-119 - Memory corruption

Description:

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

The weakness exists due to boundary error in the Graphics Device Interface (GDI) component. A remote attacker can create a specially crafted Web site, trick the victim into visiting 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.

External links:

https://technet.microsoft.com/library/security/ms16-120
https://securelist.com/blog/research/76396/windows-zero-day-exploit-used-in-targeted-attacks-by-frui...
http://securitywandering.com/?p=642

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.