CVE-2017-18547

Nelio AB Testing < 4.6.4 - Cross-Site Request Forgery

2017-05-11 00:00

Strategic Overview

Status: Patched in 4.6.4
Affected Plugin: Nelio A/B Testing – AB Tests and Heatmaps for Better Conversion Optimization
Affected Version: < 4.6.4
CVSS: 8.8High
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2017-18547

View all Nelio A/B Testing – AB Tests and Heatmaps for Better Conversion Optimization vulnerabilities

At a glance

CVE-2017-18547 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability in the Nelio A/B Testing WordPress plugin, affecting versions < 4.6.4. 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 4.6.4; sites on affected versions should update now. Disclosed May 2017.

Vulnerability Overview

The nelio-ab-testing plugin before 4.6.4 for WordPress has CSRF in experiment forms.

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 Nelio A/B Testing < 4.6.4 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 Nelio A/B Testing the fix is 4.6.4: builds < 4.6.4 are affected, anything from 4.6.4 onward is not.

Remediation

Update to version 4.6.4, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Nelio A/B Testing: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Nelio A/B Testing 4.6.4 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2017-18547 https://www.wordfence.com/threat-intel/vulnerabilities/id/28333161-9c76-4108-9256-9ffa91eaf818 https://nvd.nist.gov/vuln/detail/CVE-2017-18547

Related records

Other vulnerabilities in Nelio A/B Testing – AB Tests and Heatmaps for Better Conversion Optimization

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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