CVE-2021-24299

ReDi Restaurant Reservation <= 21.0307 - Stored Cross-Site Scripting

2021-05-09 00:00

Strategic Overview

Status: Patched in 21.0426
Affected Plugin: ReDi Restaurant Reservation – Instant Restaurant Booking & Table Reservation System
Affected Version: <= 21.0307
CVSS: 7.2High
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24299

View all ReDi Restaurant Reservation – Instant Restaurant Booking & Table Reservation System vulnerabilities

At a glance

CVE-2021-24299 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the ReDi Restaurant Reservation WordPress plugin, affecting versions <= 21.0307. 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 21.0426; sites on affected versions should update now. Disclosed May 2021, reported by Bastijn Ouwendijk.

Vulnerability Overview

The ReDi Restaurant Reservation WordPress plugin before 21.0426 provides the functionality to let users make restaurant reservations. These reservations are stored and can be listed on an 'Upcoming' page provided by the plugin. An unauthenticated user can fill in the form to make a restaurant reservation. The form to make a restaurant reservation field called 'Comment' does not use proper input validation and can be used to store XSS payloads. The XSS payloads will be executed when the plugin user goes to the 'Upcoming' page, which is an external website https://upcoming.reservationdiary.eu/ loaded in an iframe, and the stored reservation with XSS payload is loaded.

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')

ReDi Restaurant Reservation <= 21.0307 carries this weakness at Upcoming, 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 ReDi Restaurant Reservation the fix is 21.0426: builds <= 21.0307 are affected, anything from 21.0426 onward is not.

Remediation

Update to version 21.0426, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to ReDi Restaurant Reservation: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: ReDi Restaurant Reservation 21.0426 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24299 https://www.wordfence.com/threat-intel/vulnerabilities/id/6e0384c0-9b34-4af8-af86-75ef1e8d933b https://nvd.nist.gov/vuln/detail/CVE-2021-24299

Related records

Same weakness class

Other vulnerabilities in ReDi Restaurant Reservation – Instant Restaurant Booking & Table Reservation System

CVSS Vector

7.2

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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