CVE-2023-2834

BookIt <= 2.3.7 - Authentication Bypass

2023-06-20 00:00
István Márton

Strategic Overview

Status
Patched in 2.3.8
Affected Plugin
Bookit — Booking & Appointment Calendar
Affected Version
<= 2.3.7
CVSS
9.8Critical
Weakness type
CWE-288 · Authentication Bypass Using an Alternate Path or Channel
CVE
CVE-2023-2834
View all Bookit — Booking & Appointment Calendar vulnerabilities

At a glance

CVE-2023-2834 is a critical-severity Authentication Bypass Using an Alternate Path or Channel vulnerability in the Bookit WordPress plugin, affecting versions <= 2.3.7. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 2.3.8; sites on affected versions should update now. Disclosed June 2023, reported by István Márton.

Vulnerability Overview

The BookIt plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 2.3.7. This is due to insufficient verification on the user being supplied during booking an appointment through the plugin. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the email.

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. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-288: Authentication Bypass Using an Alternate Path or Channel

Reaching this weakness in Bookit <= 2.3.7 takes a caller who can reach the endpoint. Authentication bypass through an alternate path means the application has a second route to a protected action that skips the checks the primary route performs.

The protection on the main path becomes irrelevant, because the attacker simply uses the route that never asks. For Bookit the fix is 2.3.8: builds <= 2.3.7 are affected, anything from 2.3.8 onward is not.

Remediation

Update to version 2.3.8, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Bookit 2.3.8 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-2834https://www.wordfence.com/threat-intel/vulnerabilities/id/cfd32e46-a4fc-4c10-b546-9f9da75db791https://nvd.nist.gov/vuln/detail/CVE-2023-2834

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C