CVE-2020-7947

Login by Auth0 <= 3.11.3 - CSV Injection

2020-04-01 00:00

Strategic Overview

Status: Patched in 4.0.0
Affected Plugin: Login by Auth0
Affected Version: <= 3.11.3
CVSS: 9.8Critical
Weakness type: CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CVE: CVE-2020-7947

At a glance

CVE-2020-7947 is a critical-severity Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the Login by Auth0 WordPress plugin, affecting versions <= 3.11.3. It carries a CVSS score of 9.8 (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.

Vulnerability Overview

An issue was discovered in the Login by Auth0 plugin before 4.0.0 for WordPress. It has numerous fields that can contain data that is pulled from different sources. One issue with this is that the data isn't sanitized, and no input validation is performed, before the exporting of the user data. This can lead to (at least) CSV injection if a crafted Excel document is uploaded.

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

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

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-2020-7947 https://www.wordfence.com/threat-intel/vulnerabilities/id/30532dc1-5d40-4585-abd2-c08ed0682d72 https://nvd.nist.gov/vuln/detail/CVE-2020-7947

Related records

Other vulnerabilities in Login by Auth0

CVSS Vector

9.8

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

Base

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

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