CVE-2021-24965

Five Star Restaurant Reservations <= 2.4.7 - Subscriber+ Stored Cross-Site Scripting

2021-12-21 00:00
Krzysztof Zając

Strategic Overview

Status
Patched in 2.4.8
Affected Plugin
Five Star Restaurant Reservations – WordPress Booking Plugin
Affected Version
<= 2.4.7
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-24965
View all Five Star Restaurant Reservations – WordPress Booking Plugin vulnerabilities

At a glance

CVE-2021-24965 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Five Star Restaurant Reservations WordPress plugin, affecting versions <= 2.4.7. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). The issue is fixed in version 2.4.8; sites on affected versions should update now. Disclosed December 2021, reported by Krzysztof Zając.

Vulnerability Overview

The Five Star Restaurant Reservations WordPress plugin before 2.4.8 does not have capability and CSRF checks in the rtb_welcome_set_schedule AJAX action, allowing any authenticated users to call it. Due to the lack of sanitisation and escaping, users with a role as low as subscriber could perform Cross-Site Scripting attacks against logged in admins

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 interaction from a victim user.

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

Reaching this weakness in Five Star Restaurant Reservations <= 2.4.7 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 Five Star Restaurant Reservations the fix is 2.4.8: builds <= 2.4.7 are affected, anything from 2.4.8 onward is not.

Remediation

Update to version 2.4.8, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Five Star Restaurant Reservations: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Five Star Restaurant Reservations 2.4.8 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24965https://www.wordfence.com/threat-intel/vulnerabilities/id/a3e61538-0bd9-4319-ba71-a72c9039f4d8https://nvd.nist.gov/vuln/detail/CVE-2021-24965

Related records

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