CVE-2017-18544

Invite Anyone < 1.3.16 - Cross-Site Request Forgery

2017-03-22 00:00

Strategic Overview

Status: Patched in 1.3.16
Affected Plugin: Invite Anyone
Affected Version: < 1.3.16
CVSS: 8.8High
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2017-18544

At a glance

CVE-2017-18544 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability in the Invite Anyone WordPress plugin, affecting versions < 1.3.16. 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 1.3.16; sites on affected versions should update now. Disclosed March 2017.

Vulnerability Overview

The Invite Anyone plugin before 1.3.16 for WordPress has admin-panel CSRF. The plugin’s setting pages had a vulnerability found in the nonce, which is used to prevent CSRF, but when the settings are saved there was no check to a validate if a nonce was included.

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 Invite Anyone < 1.3.16 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 Invite Anyone the fix is 1.3.16: builds < 1.3.16 are affected, anything from 1.3.16 onward is not.

Remediation

Update to version 1.3.16, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Invite Anyone: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Invite Anyone 1.3.16 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2017-18544 https://www.wordfence.com/threat-intel/vulnerabilities/id/101edd24-3f9e-4055-8547-9cd7e2b626b5 https://nvd.nist.gov/vuln/detail/CVE-2017-18544

Related records

Other vulnerabilities in Invite Anyone

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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