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How does PHP unserialize allow remote code execution?
In our code the application takes a file name, which gets read using PHP file_get_contents function. The output is then fed to php unserialize module. With the above bug both application level and system level code executions is possible, we will get into that soon. In order to successfully exploit the above bug three conditions must be satisfied:
What is the vulnerability in the unserialize function in PHP?
In the above code, user controlled value could be passed on to PHP un-serialization function. The vulnerability occurs when user-supplied input is not properly sanitized before being passed to the unserialize ().
How to rewrite all requests to index.php?
In configuration file itself explained that at “First attempt to serve request as file, then as directory, then fall back to index.html in my case it is index.php as I am providing page through php code. Using nginx $is_args instead of ? For GET query Strings
Can a remote code execution via PHP lead to RCE?
At NotSoSecure, we conduct Pen Test/ Code Reviews on a day-to-day basis and we recently came across an interesting piece of PHP code that could lead to RCE, but the exploitation was bit tricky.
How to exploit the deserialization flaw in PHP?
You can achieve RCE using this deserialization flaw because a user-provided object is passed into unserialize. And the class Example2 has a magic function that runs eval () on user-provided input. To exploit this RCE, you simply have to set your data cookie to a serialized Example2 object with the hook property set to whatever PHP code you want.
How to exploit PHP deserialization.intro to object injection?
To exploit this RCE, you simply have to set your data cookie to a serialized Example2 object with the hook property set to whatever PHP code you want. You can generate the serialized object using the following code snippet: // We need to use URL encoding since we are injecting the object via a URL.