CVE-2021-25092

Link Library <= 7.2.7 - Cross-Site Request Forgery to Library Settings Reset

2021-12-30 00:00

Strategic Overview

Status: Patched in 7.2.8
Affected Plugin: Link Library
Affected Version: <= 7.2.7
CVSS: 4.3Medium
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2021-25092

At a glance

CVE-2021-25092 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Link Library WordPress plugin, affecting versions <= 7.2.7. 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 7.2.8; sites on affected versions should update now. Disclosed December 2021, reported by Krzysztof Zając.

Vulnerability Overview

The Link Library WordPress plugin before 7.2.8 does not have CSRF check when resetting library settings, allowing attackers to make a logged in admin reset arbitrary settings via a CSRF attack

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 Link Library <= 7.2.7 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 Link Library the fix is 7.2.8: builds <= 7.2.7 are affected, anything from 7.2.8 onward is not.

Remediation

Update to version 7.2.8, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Link Library: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Link Library 7.2.8 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-25092 https://www.wordfence.com/threat-intel/vulnerabilities/id/cd1fc89f-b0f0-43a3-a311-07a79232a3ea https://nvd.nist.gov/vuln/detail/CVE-2021-25092

Related records

Same weakness class

4.3CVE-2024-24875: Link Library <= 7.5.13 Cross-Site Request ForgeryCVE-2024-24875

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

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