Arbitrary PHP Code Execution via Language Cookie in Discuz!ML 3.2-3.4
Discuz!ML versions 3.2 through 3.4 are vulnerable to arbitrary PHP code execution due to improper handling of the language cookie. An attacker can modify the language cookie value to inject and execute arbitrary PHP code on the server. For example, by setting the cookie 4gH4_0df5_language to a value such as en'.phpinfo().';, the attacker can trigger execution of the phpinfo() function, demonstrating code execution. The vulnerability is due to insufficient sanitization of user-supplied input in the language cookie, which is used in a PHP eval context or similar dynamic code inclusion.
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