CVE-2022-1463

Booking Calendar <= 9.1 - PHP Object Injection via Shortcode

2022-04-18 00:00

Strategic Overview

Status: Patched in 9.1.1
Affected Plugin: Booking Calendar
Affected Version: <= 9.1
CVSS: 8.5High
Weakness type: CWE-502 · Deserialization of Untrusted Data
CVE: CVE-2022-1463

View all Booking Calendar vulnerabilities

At a glance

CVE-2022-1463 is a high-severity Deserialization of Untrusted Data vulnerability in the Booking Calendar WordPress plugin, affecting versions <= 9.1. It carries a CVSS score of 8.5 (reachable over the network; high confidentiality, integrity, availability impact). The issue is fixed in version 9.1.1; sites on affected versions should update now. Disclosed April 2022, reported by Ram.

Vulnerability Overview

The Booking Calendar plugin for WordPress is vulnerable to PHP Object Injection via the [bookingflextimeline] shortcode in versions up to, and including, 9.1. This could be exploited by subscriber-level users and above to call arbitrary PHP objects on a vulnerable site.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-502: Deserialization of Untrusted Data

Reaching this weakness in Booking Calendar <= 9.1 takes a caller who can reach the endpoint. Deserialization of untrusted data means the application reconstructs objects from input a caller controls, letting the attacker choose which classes get instantiated and what their properties hold.

A workable chain turns deserialization into file writes, deletions or code execution, depending on what the loaded classes do in their magic methods. For Booking Calendar the fix is 9.1.1: builds <= 9.1 are affected, anything from 9.1.1 onward is not.

Remediation

Update to version 9.1.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Booking Calendar: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Booking Calendar 9.1.1 closes this, and updating the plugin is the step that ends it.

Firewall
Scanner
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2022-1463 https://www.wordfence.com/threat-intel/vulnerabilities/id/55491c64-e4b5-4919-bdcb-7285f2a3c3cd https://nvd.nist.gov/vuln/detail/CVE-2022-1463

Related records

Other vulnerabilities in Booking Calendar

CVSS Vector

8.5

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Base

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredLow
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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