Add PoC exploit for CVE-2023-22527

[postmodern]

Add a PoC exploit for CVE-2023-22527, SSTI that allows RCE in Confluence Data Center and Server.

Reference PoCs

• https://github.com/YongYe-Security/CVE-2023-22527/blob/main/CVE-2023-22527.py#L44
• https://github.com/MaanVader/CVE-2023-22527-POC/blob/master/exploit.py#L24-L33
• https://github.com/yoryio/CVE-2023-22527/blob/main/CVE-2023-22527.py (contains a vulnerable version check)
• https://github.com/Manh130902/CVE-2023-22527-POC/blob/main/CVE-2023-22527.py (extracts the version from the HTML and performs a vulnerable version check)
• https://github.com/Niuwoo/CVE-2023-22527/blob/main/CVE-2023-22527.py#L29-L30 (contains a vulnerability test)

Vuln App

• https://github.com/vulhub/vulhub/tree/639e32be6c0425b11d7d56594761c5e599a6a9d5/confluence/CVE-2023-22527

How to Submit a PoC

See the CONTRIBUTING file for instructions on how to submit a PoC exploit.