CVE-2021-24429

Salon booking system < 6.3.1 - Stored Cross-Site Scripting

2021-06-21 00:00
Phu Tran

Strategic Overview

Status
Patched in 6.3.1
Affected Plugin
Salon Booking System – Appointment Booking for Salons, Barbershops & Spas
Affected Version
< 6.3.1
CVSS
6.1Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-24429
View all Salon Booking System – Appointment Booking for Salons, Barbershops & Spas vulnerabilities

At a glance

CVE-2021-24429 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Salon Booking System WordPress plugin, affecting versions < 6.3.1. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 6.3.1; sites on affected versions should update now. Disclosed June 2021, reported by Phu Tran.

Vulnerability Overview

The Salon booking system WordPress plugin before 6.3.1 does not properly sanitise and escape the First Name field when booking an appointment, allowing low privilege users such as subscriber to set JavaScript in them, leading to a Stored Cross-Site Scripting (XSS) vulnerability. The Payload will then be triggered when an admin visits the "Calendar" page and the malicious script is executed in the admin context.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Salon Booking System < 6.3.1 carries this weakness at Calendar, and reaching it takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Salon Booking System the fix is 6.3.1: builds < 6.3.1 are affected, anything from 6.3.1 onward is not.

Remediation

Update to version 6.3.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Salon Booking System: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Salon Booking System 6.3.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24429https://www.wordfence.com/threat-intel/vulnerabilities/id/13657ad7-7185-4be2-98e2-aeaf8514ad4dhttps://nvd.nist.gov/vuln/detail/CVE-2021-24429

Related records

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