# PHP ``` ======================================================================= PHP in Linux calls a binary (sendmail) when the mail() function is executed. If we have putenv() allowed, we can set the environment variable "LD_PRELOAD", so we can preload an arbitrary shared object. Our shared object will execute our custom payload (a binary or a bash script) without the PHP restrictions, so we can have a reverse shell, for example. ====================================================================== ============================Exploit For Above Summary : Link : https://github.com/TarlogicSecurity/Chankro >>> python2 chankro.py --arch 64 --input rev.sh --output chan.php --path /var/www/html ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://p1yushsecurity.gitbook.io/offsec/common-ports/tcp/http-https/web-technology/php.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.