Zero-day vulnerability in Adobe Flash Player

Type confusion
CVE-2017-11292

According to Kaspersky Lab, the vulnerability has being exploited by the BlackOasis threat actor. The recent attacks leveraging today's zero-day sent malicious Office documents to victims, which came with an embedded ActiveX object that contained the Flash CVE-2017-11292 exploit.

Known malware:

FINSPY

Vulnerability details

Advisory: SB2017101602 - Remote code execution in Adobe Flash Player

Vulnerable component: Adobe Flash Player

CVE-ID: CVE-2017-11292

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-704 - Type conversion

Description:

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

The vulnerability exists due to a type confusion error when processing .swf files. A remote unauthenticated attacker can create a specially crafted .swf file, trick the victim into opening it and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: this vulnerability is being actively exploited in the wild.

External links:

https://helpx.adobe.com/security/products/flash-player/apsb17-32.html
https://securelist.com/blackoasis-apt-and-new-targeted-attacks-leveraging-zero-day-exploit/82732/

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.