Gadget-free RCE in Fastjson 1.2.83

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Kirill Firsov on X: "We found a gadget-free RCE in Fastjson 1.2.83 - the final release of the 1.x line, and still one of the most widely-deployed Java JSON libraries in production today, even with 2.x around.<br>No classpath gadget. One payload-&gt; RCE. https://t.co/8pbjl1M8y7" / X<br>Post

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Kirill Firsov

@k_firsov

We found a gadget-free RCE in Fastjson 1.2.83 - the final release of the 1.x line, and still one of the most widely-deployed Java JSON libraries in production today, even with 2.x around.<br>No classpath gadget. One payload-> RCE.

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span:not(:empty)~span:not(:empty)]:before:content-['·'] [&>span:not(:empty)~span:not(:empty)]:before:px-1 [&>span:not(:empty)~span:not(:empty)]:before:shrink-0">3:59 PM · Jul 19, 202635.1KViews

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