Zero-day vulnerability in Adobe Flash Player

Use-after-free error
CVE-2015-0311

The vulnerability was discovered by French security researcher тАЬKafeineтАЭ.
It was actively being exploited in the wild via drive-by-download attacks against systems running Internet Explorer and Firefox on Windows 8.1 and below. It was used by Angler EK and infected at least 1,800 known domains.

Known malware:

SWF/Exploit.CVE-2015-0311.N(2)
Trojan.Swifi (Symantec)
Angler EK

Vulnerability details

Advisory: SB2015012201 - Remote code execution in Adobe Flash Player

Vulnerable component: Adobe Flash Player

CVE-ID: CVE-2015-0311

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

Description:

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

The weakness exists due to use-after-free error when processing .swf files. 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.

Public Exploits:

- Adobe Flash Player - ByteArray UncompressViaZlibVariant Use-After-Free (Metasploit) [Exploit-DB]

External links:

https://helpx.adobe.com/security/products/flash-player/apsb15-03.html
http://blog.trendmicro.com/trendlabs-security-intelligence/os-x-zero-days-on-the-rise-a-2015-midyear...
http://blog.trendmicro.com/trendlabs-security-intelligence/analyzing-cve-2015-0311-flash-zero-day-vu...
http://researchcenter.paloaltonetworks.com/2015/01/unpatched-flash-vulnerability-cve-2015-0311-block...
http://securityaffairs.co/wordpress/32687/security/adobe-fix-cve-2015-0311-0day.html
http://www.kamnet.com/adobe-flash-player-vulnerability-cve-2015-0311/
http://www.criticalwatch.com/faqs/zero-day-vulnerability-in-adobe-flash/
http://www.free-remove-spyware.com/post/Cannot-Remove-SWFExploit.CVE-2015-0311.N2-SWFExploit.CVE-201...
http://www.securityweek.com/adobe-fixes-second-flash-player-zero-day-vulnerability
http://www.pcworld.com/article/2878792/flash-player-plagued-by-third-zeroday-flaw-in-a-month-updates...

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.