Missing or Permissive Content-Security-Policy frame-ancestors HTTP Response Header

info Nessus Plugin ID 50344
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote web server does not take steps to mitigate a class of web application vulnerabilities.

Description

The remote web server in some responses sets a permissive Content-Security-Policy (CSP) frame-ancestors response header or does not set one at all.

The CSP frame-ancestors header has been proposed by the W3C Web Application Security Working Group as a way to mitigate cross-site scripting and clickjacking attacks.

Solution

Set a non-permissive Content-Security-Policy frame-ancestors header for all requested resources.

See Also

http://www.nessus.org/u?55aa8f57

http://www.nessus.org/u?07cc2a06

https://content-security-policy.com/

https://www.w3.org/TR/CSP2/

Plugin Details

Severity: Info

ID: 50344

File Name: http_X_Content_Security_Policy_header.nasl

Version: 1.6

Type: remote

Family: CGI abuses

Published: 10/26/2010

Updated: 1/19/2021

Dependencies: webmirror.nasl

Vulnerability Information