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CVE-2023-6654 is a critical vulnerability in PHPEMS versions 6.x through 9.0, specifically in the lib/session.cls.php file, which handles session data. The vulnerability arises from unsafe deserialization of user-supplied data, allowing an attacker to inject arbitrary objects into the application context. This can be exploited remotely, and public exploits are available.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a working exploit for CVE-2023-6654, a PHPEMS cookie deserialization vulnerability affecting versions 6.x through 9.0. The exploit is implemented in Python (exp.py) and requires the 'requests' and 'argparse' libraries. The script first retrieves a cryptographic key from the target PHPEMS instance by parsing the 'exam_currentuser' cookie. It then crafts a malicious serialized PHP object, encodes it, and sets it as the value of the 'exam_currentuser' cookie in a request to the target. This payload triggers a SQL injection via PHP object deserialization, allowing the attacker to either change the password of a specified user or elevate their privileges to administrator. The README provides usage instructions and describes the vulnerability. The repository is operational and can be used to compromise PHPEMS installations that are vulnerable and accessible over the network.
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