CVE-2021-24725

Comment Link Remove and Other Comment Tools <= 2.1.4 - Arbitrary Comment Deletion via Cross-Site Request Forgery

2021-08-23 00:00

Strategic Overview

Status: Patched in 2.1.6
Affected Plugin: Comment Link Remove and Other Comment Tools
Affected Version: <= 2.1.4
CVSS: 4.3Medium
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2021-24725

View all Comment Link Remove and Other Comment Tools vulnerabilities

At a glance

CVE-2021-24725 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Comment Link Remove and Other Comment Tools WordPress plugin, affecting versions <= 2.1.4. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.1.6; sites on affected versions should update now. Disclosed August 2021, reported by Martin Vierula.

Vulnerability Overview

The Comment Link Remove and Other Comment Tools WordPress plugin before 2.1.6 does not have CSRF check in its 'Delete comments easily', which could allow attackers to make logged in admin delete arbitrary comments

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.

CWE-352: Cross-Site Request Forgery (CSRF)

Reaching this weakness in Comment Link Remove and Other Comment Tools <= 2.1.4 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Comment Link Remove and Other Comment Tools the fix is 2.1.6: builds <= 2.1.4 are affected, anything from 2.1.6 onward is not.

Remediation

Update to version 2.1.6, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Comment Link Remove and Other Comment Tools: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Comment Link Remove and Other Comment Tools 2.1.6 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24725 https://www.wordfence.com/threat-intel/vulnerabilities/id/b9d63462-04ec-4b46-91cf-25b7dd098fc7 https://nvd.nist.gov/vuln/detail/CVE-2021-24725

CVSS Vector

4.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

This record contains material that is subject to copyright

CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

https://www.cve.org/Legal/TermsOfUse

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/