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WordPress WPSchoolPress 2.1.16 Cross Site Scripting

WordPress WPSchoolPress 2.1.16 Cross Site Scripting
Posted Nov 15, 2021
Authored by Davide Taraschi

WordPress WPSchoolPress plugin version 2.1.16 suffers from cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss
advisories | CVE-2021-24664
SHA-256 | 517dc09ed7e3d8428eb56c6d5e48f959a5f11262d27feba88e89228caa02ab51

WordPress WPSchoolPress 2.1.16 Cross Site Scripting

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# Exploit Title: WordPress Plugin WPSchoolPress 2.1.16 - 'Multiple' Cross Site Scripting (XSS)
# Date: 20/08/2021
# Exploit Author: Davide Taraschi
# Vendor Homepage: https://wpschoolpress.com/
# Software Link: https://wpschoolpress.com/free-download/
# Version: up to 2.1.17 (non included)
# Tested on: Ubuntu 20.04 over WordPress 5.8 and apache2
# CVE : CVE-2021-24664

# Description:
The plugin sanitise some fields using a wordpress built-in function called sanitize_text_field() but does not correctly escape them before outputting in attributes, resulting in Stored Cross-Site Scripting issues.
The function wp_sanitize_text_field() escape < and > but does not escape characters like ", allowing an attacker to break a HTML input tag and inject arbitrary javascript.

# PoC:
As admin,
- Add a new teacher attendance (/wp-admin/admin.php?page=sch-teacherattendance), Tick the Absent box and put the following payload in the Reason: "style=animation-name:rotation onanimationstart=alert(/XSS/)//
The XSS will be triggered when adding another teacher attendance by clicking on the Add button

- Add a new Student Attendance (/wp-admin/admin.php?page=sch-attendance), tick the Absent box and put the following payload in the Reason: " style=animation-name:rotation onanimationstart=alert(/XSS/)//
The XSS will be triggered when adding another attendance by clicking the 'Add/Update' button

- Add a new Subject Mark Field (/wp-admin/admin.php?page=sch-settings&sc=subField) and put the following payload in the 'Field': " autofocus onfocus=alert(/XSS/)//
The XSS will be triggered when editing the created Subject Mark (ie /admin.php?page=sch-settings&sc=subField&ac=edit&sid=3)

- Create a new Subject (/wp-admin/admin.php?page=sch-subject), with the following payload in the Subject Name field: " autofocus onfocus=alert(/XSS/)//
The XSS will be triggered when editing the Subject

- Create a new Exam (/wp-admin/admin.php?page=sch-exams) with the following payload in the Exam Name Field: " autofocus onfocus=alert(/XSS/)//
The XSS will be triggered when editing the Exam=20

Note that some of this XSS issues can be executed by a teacher (medium-privileged user), but since wordpress uses HTTPonly cookies is impossible to steal cookies.

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