CVE-2022-4035

Appointment Hour Booking <= 1.3.72 - Unauthenticated iFrame Injection via Appointment Form

2022-11-29 00:00
Luca Greeb

Strategic Overview

Status
Patched in 1.3.73
Affected Plugin
Appointment Hour Booking – Booking Calendar
Affected Version
<= 1.3.72
CVSS
7.2High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2022-4035
View all Appointment Hour Booking – Booking Calendar vulnerabilities

At a glance

CVE-2022-4035 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Appointment Hour Booking WordPress plugin, affecting versions <= 1.3.72. 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 1.3.73; sites on affected versions should update now. Disclosed November 2022, reported by Luca Greeb.

Vulnerability Overview

The Appointment Hour Booking plugin for WordPress is vulnerable to iFrame Injection via the ‘email’ or general field parameters in versions up to, and including, 1.3.72 due to insufficient input sanitization and output escaping that makes injecting iFrame tags possible. This makes it possible for unauthenticated attackers to inject iFrames when submitting a booking that will execute whenever a user accesses the injected booking details 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 Hour Booking <= 1.3.72 carries this weakness at email, and reaching it takes no account at all. 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 Hour Booking the fix is 1.3.73: builds <= 1.3.72 are affected, anything from 1.3.73 onward is not.

Remediation

Update to version 1.3.73, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Appointment Hour Booking 1.3.73 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2022-4035https://www.wordfence.com/threat-intel/vulnerabilities/id/870ae326-a7c9-4201-bf0d-0fbda663a694https://nvd.nist.gov/vuln/detail/CVE-2022-4035

Related records

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