WordPress Core < 5.1.1 - Cross-Site Request Forgery to Cross-Site Scripting via Comments

2019-04-12 00:00

Simon Scannell

Strategic Overview

Status

Patched in 3.7.29

Affected CoreWordPress 5.1

Affected Version3.7 – 5.1 · 16 branches

CVSS9.6Critical

CVECVE-2019-9787

View all WordPress 5.1 vulnerabilities

Vulnerability Overview

WordPress before 5.1.1 does not properly filter comment content, leading to Remote Code Execution by unauthenticated users in a default configuration. This occurs because CSRF protection is mishandled, and because Search Engine Optimization of A elements is performed incorrectly, leading to XSS. The XSS results in administrative access, which allows arbitrary changes to .php files. This is related to wp-admin/includes/ajax-actions.php and wp-includes/comment.php.

Technical Analysis

REMEDIATION: Update to one of the following versions, or a newer patched version: 3.7.29, 3.8.29, 3.9.27, 4.0.26, 4.1.26, 4.2.23, 4.3.19, 4.4.18, 4.5.17, 4.6.14, 4.7.13, 4.8.9, 4.9.10, 5.0.4, 5.1.1 --- IDENTIFIER: CWE-352 (Cross-Site Request Forgery (CSRF)) The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

External References

https://www.cve.org/CVERecord?id=CVE-2019-9787 https://www.wordfence.com/threat-intel/vulnerabilities/id/a50531df-e876-463c-a06b-16b2f30aeefe

CVSS Vector

9.6

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

Base

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

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