CVE-2020-5391

Login by Auth0 <= 3.11.3 - Cross-Site Request Forgery

2020-04-01 00:00

Strategic Overview

Status: Patched in 4.0.0
Affected Plugin: Login by Auth0
Affected Version: <= 3.11.3
CVSS: 8.8High
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2020-5391

At a glance

CVE-2020-5391 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability in the Login by Auth0 WordPress plugin, affecting versions <= 3.11.3. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 4.0.0; sites on affected versions should update now. Disclosed April 2020, reported by Muhamad Visat.

Vulnerability Overview

Cross-site request forgery (CSRF) vulnerabilities exist in the Auth0 plugin before 4.0.0 for WordPress via the domain field.

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. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

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

Reaching this weakness in Login by Auth0 <= 3.11.3 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 Login by Auth0 the fix is 4.0.0: builds <= 3.11.3 are affected, anything from 4.0.0 onward is not.

Remediation

Update to version 4.0.0, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Login by Auth0: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Login by Auth0 4.0.0 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2020-5391 https://www.wordfence.com/threat-intel/vulnerabilities/id/ecf36533-1dd1-43d7-b12e-7b425c13530a https://nvd.nist.gov/vuln/detail/CVE-2020-5391

Related records

Other vulnerabilities in Login by Auth0

CVSS Vector

8.8

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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