Security Experts:

Recently Exploited Flash Zero-Day Added to Exploit Kits

The recently discovered CVE-2015-7645 zero-day vulnerability in Adobe Flash Player has been already added to Angler Exploit Kit (EK) and Nuclear EK, anti-malware firm Malwarebytes reported.

The security flaw was discovered in mid-October, when it was found being exploited by the Russia-linked Pawn Storm threat group in attacks aimed at Foreign Affairs Ministries. The vulnerability affects all Flash releases up to version for Mac and Windows, and Flash Player for Linux, and was discovered by researchers at Trend Micro.

Adobe patched the vulnerability one week after the attacks were discovered, when it also resolved CVE-2015-7647 and CVE-2015-7648 vulnerabilities that could result in arbitrary code execution. The Pawn Storm group exploited the CVE-2015-7645 zero-day through luring victims (employees of Foreign Affairs Ministries from around the world) to websites containing the Flash Player exploit by means of spear-phishing emails.

The inclusion of this zero-day in Angler EK and Nuclear EK renders Flash users even more vulnerable to different types of attacks, especially if they do not keep the Web browser plugin updated. 

The developers of exploit kits are aggressive in integrating newly discovered vulnerabilities into their malicious programs, and it usually takes them only a couple of weeks to do so. In August, the developers of the Angler exploit kit added support for an Internet Explorer vulnerability just weeks after it was patched by Microsoft. In May, a memory corruption flaw in Flash version prior to was added to Angler EK only two weeks after it was patched, and it was added to Magnitude, Neutrino, and Nuclear Pack EKs as well only a few days later.

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