Appointment Booking Calendar <= 1.2.24 - Cross-Site Scripting

2016-01-26 00:00
Joaquin Ramirez Martinez

Strategic Overview

Status
Patched in 1.2.25
Affected Plugin
Appointment Booking Calendar
Affected Version
<= 1.2.24
CVSS
7.2High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE pending
View all Appointment Booking Calendar vulnerabilities

At a glance

This record tracks a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Appointment Booking Calendar WordPress plugin, affecting versions <= 1.2.24. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.2.25; sites on affected versions should update now. Disclosed January 2016, reported by Joaquin Ramirez Martinez.

Vulnerability Overview

The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via several parameters such as the 'name' and 'ict' parameters in versions up to, and including, 1.2.24. This is due to insufficient input sanitization and output escaping and makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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, and no interaction from a victim user.

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

Appointment Booking Calendar <= 1.2.24 carries this weakness at name, 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 Appointment Booking Calendar the fix is 1.2.25: builds <= 1.2.24 are affected, anything from 1.2.25 onward is not.

Remediation

Update to version 1.2.25, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Appointment Booking Calendar: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Appointment Booking Calendar 1.2.25 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/13c9a71f-ec0a-4d4a-be08-787aa22a0fae

Related records

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