Zero-day vulnerability in Adobe Flash Player

тАЬUse-after-freeтАЭ error
CVE-2015-5122

The exploit code was revealed after Hacking Team data leak. The exploit was used against Japanese organizations.
The vulnerability was reported by Dhanesh Kizhakkinan of FireEye as well as Peter Pi of TrendMicro.

Known malware:

Exploit kits: Angler EK - 2015-07-11 Neutrino - 2015-07-13 Nuclear Pack - 2015-07-14 RIG - 2015-07-14 Magnitude - 2015-07-15 NullHole - 2015-07-22 Spartan - 2015-09-11

Vulnerability details

Advisory: SB2015071001 - Two remote code execution vulnerabilities in Adobe Flash Player

Vulnerable component: Adobe Flash Player

CVE-ID: CVE-2015-5122

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-119 - Memory corruption

Description:

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 ActionScript 3 opaqueBackground class. 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:

CNACOM campaign

The campaign mainly targeted Taiwanese organizations and supposedly has Chinese origin.

Public Exploits:

- Adobe Flash - opaqueBackground Use-After-Free (Metasploit) [Exploit-DB]

External links:

https://helpx.adobe.com/security/products/flash-player/apsa15-04.html
https://helpx.adobe.com/security/products/flash-player/apsb15-18.html
https://www.symantec.com/security_response/attacksignatures/detail.jsp?asid=28060
http://blog.trendmicro.com/trendlabs-security-intelligence/another-zero-day-vulnerability-arises-fro...

https://www.fireeye.com/blog/threat-research/2015/07/second_adobe_flashz0.html
https://krebsonsecurity.com/2015/07/adobe-to-fix-another-hacking-team-zero-day/
https://packetstormsecurity.com/files/132663/Adobe-Flash-opaqueBackground-Use-After-Free.html
http://www.hackingtutorials.org/metasploit-tutorials/metasploit-cve-2015-5122-flash-exploit-tutorial...
http://securityaffairs.co/wordpress/38531/cyber-crime/hacking-team-2-flash-0day.html
http://www.theregister.co.uk/2015/07/12/adobe_flash_zero_day_cve_2015_5122/
http://researchcenter.paloaltonetworks.com/2015/07/watering-hole-attack-on-aerospace-firm-exploits-c...
https://arstechnica.com/security/2015/07/two-new-flash-exploits-surface-from-hacking-team-combine-wi...
https://www.tripwire.com/state-of-security/vulnerability-management/another-zero-day-flash-exploit-r...
https://www.scmagazine.com/researchers-report-flash-player-zero-day-bugs-after-hacking-team-leaks/ar...
http://www.zdnet.com/article/adobe-promises-patch-for-latest-wave-of-critical-hacking-team-zero-day-...


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.