Trustwave Unveils New Offerings to Maximize Value of Microsoft Security Investments. Learn More

Trustwave Unveils New Offerings to Maximize Value of Microsoft Security Investments. Learn More

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SpiderLabs Blog

First Java 0day For The Year 2013

Today @Kafeine was the first to announce the new Java 0day. This 0day allows an attacker to execute malicious code on any desktop with Java 1.7 u10 (or prior) installed –which is the latest version from Oracle.

After some preliminary analysis it seems this 0day is using a similar tactic toCVE-2012-5088,which was patched by Oracle last October. On top of using java.lang.invoke.MethodHandle.InvokeWithArguments()from CVE-2012-5088, the attacker smartly takes advantage of MBeanInstantiator in order to get a reference to a restricted class from a trusted caller (MBeanInstantiatoris trusted). This is accomplished via the find Class method, which in turn will call the inner load Class method.

The "heart" of the exploit: 11639_c3641edd-933d-44ed-a538-1ee53490f28b
We are glad to announce that all our customers using Trustwave's Secure Web Gateway are protected against this 0day attack. There's no need for any additional updates to be applied. A good continuation of last year's streak of 4 out of 4 Java 0days blocked out of the box.

We will continue monitoring this threat and provide protection to our customers.

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