Zero-day vulnerability in Adobe Flash Player

Type confusion
CVE-2015-7645

Was used in Pawn Storm Campaign Targeting Foreign Affairs Ministries. Exploited by the Fancy Bear APT.
The vulnerability was reported by Peter Pi of Trend Micro.

Known malware:

Exploit Kits: Angler, Hunter, Magnitude, Neutrino, Nuclear Pack, RIG, Spartan.

Vulnerability details

Advisory: SB2015101301 - Remote code execution in Adobe Flash Player

Vulnerable component: Adobe Flash Player

CVE-ID: CVE-2015-7645

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-843 - Type confusion

Description:

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

The weakness exists due to type confusion error. 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 results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Known APT campaigns:

Foreign Affairs Ministries breach

The attacks is believed to be performed by the threat group known as PawnStorm.

Public Exploits:

- Adobe Flash IExternalizable.writeExternal - Type Confusion [Exploit-DB]

External links:

https://helpx.adobe.com/security/products/flash-player/apsa15-05.html
https://helpx.adobe.com/security/products/flash-player/apsb15-27.html
http://blog.trendmicro.com/trendlabs-security-intelligence/new-adobe-flash-zero-day-used-in-pawn-sto...
http://resources.infosecinstitute.com/the-shadow-of-the-russian-cyber-army-behind-the-2016-president...
https://www.symantec.com/security_response/attacksignatures/detail.jsp?asid=28924
https://www.symantec.com/security_response/writeup.jsp?docid=2015-101903-5534-99
https://www.mysonicwall.com/sonicalert/searchresults.aspx?ev=article&id=869
http://www.theregister.co.uk/2016/12/08/need_xmas_ideas_try_cve20157645_a_flash_gift_that_keeps_on_g...
http://www.securityweek.com/adobe-patches-flash-zero-day-exploited-pawn-storm
http://vulnerablespace.blogspot.com/2016/04/malware-analysing-and-repurposing.html
https://blog.malwarebytes.com/threat-analysis/2015/10/new-flash-player-zero-day-in-the-wild/
https://arstechnica.com/security/2015/10/new-zero-day-exploit-hits-fully-patched-adobe-flash/
http://securityaffairs.co/wordpress/41123/cyber-crime/flash-zero-day-exploit.html
http://www.infoworld.com/article/3046531/security/ransomware-targets-flash-and-silverlight-vulnerabi...
https://www.tripwire.com/state-of-security/latest-security-news/flash-player-zero-day-patched-by-ado...
http://www.welivesecurity.com/2015/10/15/adobe-flash-zero-day/
https://threatpost.com/emergency-adobe-flash-zero-day-patch-arrives-ahead-of-schedule/115073/
http://thehackernews.com/2015/10/flash-patch-update.html
https://www.scmagazine.com/adobe-addresses-latest-flash-player-zero-day-vulnerability/article/533522...

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.