CVE-2021-24603

Site Reviews <= 5.13.0 - Admin+ Stored Cross-Site Scripting

2021-08-09 00:00

Strategic Overview

Status: Patched in 5.13.1
Affected Plugin: Site Reviews
Affected Version: < 5.13.1
CVSS: 5.5Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24603

At a glance

CVE-2021-24603 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Site Reviews WordPress plugin, affecting versions < 5.13.1. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). The issue is fixed in version 5.13.1; sites on affected versions should update now. Disclosed August 2021, reported by Asif Nawaz Minhas.

Vulnerability Overview

The Site Reviews WordPress plugin before 5.13.1 does not sanitise some of its Review Details when adding a review as an admin, which could allow them to perform Cross-Site Scripting attacks when the unfiltered_html is disallowed

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 Site Reviews < 5.13.1 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 Site Reviews the fix is 5.13.1: builds < 5.13.1 are affected, anything from 5.13.1 onward is not.

Remediation

Update to version 5.13.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Site Reviews: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Site Reviews 5.13.1 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24603 https://www.wordfence.com/threat-intel/vulnerabilities/id/3a84a021-5014-4848-a77f-d3f4802c9395 https://nvd.nist.gov/vuln/detail/CVE-2021-24603

Related records

Same weakness class

Other vulnerabilities in Site Reviews

CVSS Vector

5.5

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

Base

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

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