CVE-2021-25121

Rating by BestWebSoft <= 1.5 - Rating Denial of Service

2022-05-24 00:00

Strategic Overview

Status: Patched in 1.6
Affected Plugin: Rating by BestWebSoft
Affected Version: <= 1.5
CVSS: 5.3Medium
Weakness type: CWE-400 · Uncontrolled Resource Consumption
CVE: CVE-2021-25121

View all Rating by BestWebSoft vulnerabilities

At a glance

CVE-2021-25121 is a medium-severity Uncontrolled Resource Consumption vulnerability in the Rating by BestWebSoft WordPress plugin, affecting versions <= 1.5. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.6; sites on affected versions should update now. Disclosed May 2022, reported by Drew Jones.

Vulnerability Overview

The Rating by BestWebSoft WordPress plugin through 1.5 does not validate the submitted rating, allowing submission of long integer, causing a Denial of Service on the post/page when a user submit such rating

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-400: Uncontrolled Resource Consumption

Reaching this weakness in Rating by BestWebSoft <= 1.5 takes a caller who can reach the endpoint. Uncontrolled resource consumption means a request can make the server do an amount of work it never bounds, because the size or repetition of the job is taken from the request rather than capped by the code.

A single caller can hold PHP workers, database connections or disk open long enough to slow the site for everyone, without needing any account or any other flaw. For Rating by BestWebSoft the fix is 1.6: builds <= 1.5 are affected, anything from 1.6 onward is not.

Remediation

Update to version 1.6, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Rating by BestWebSoft: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Rating by BestWebSoft 1.6 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-25121 https://www.wordfence.com/threat-intel/vulnerabilities/id/3511a3d3-1e6e-41ba-a8b9-67f8f7eef157 https://nvd.nist.gov/vuln/detail/CVE-2021-25121

Related records

Other vulnerabilities in Rating by BestWebSoft

CVSS Vector

5.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityLow

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