CVE-2020-6753

Login by Auth0 <= 3.11.3 - Stored Cross-Site Scripting

2020-04-01 00:00

Strategic Overview

Status: Patched in 4.0.0
Affected Plugin: Login by Auth0
Affected Version: <= 3.11.3
CVSS: 7.2High
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2020-6753

At a glance

CVE-2020-6753 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Login by Auth0 WordPress plugin, affecting versions <= 3.11.3. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). 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

The Login by Auth0 plugin before 4.0.0 for WordPress allows stored XSS on multiple pages, a different issue than CVE-2020-5392.

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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Login by Auth0 <= 3.11.3 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 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-2020-6753 https://www.wordfence.com/threat-intel/vulnerabilities/id/afc6aec8-e486-4c35-9e58-da6e04d88c25 https://nvd.nist.gov/vuln/detail/CVE-2020-6753

Related records

Same weakness class

Other vulnerabilities in Login by Auth0

CVSS Vector

7.2

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

Base

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

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