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From: dxw Security <security () dxw com>
Date: Wed, 17 Sep 2014 13:59:56 +0000

Details

Software: WP-Ban Version: 1.62 Homepage: http://wordpress.org/plugins/wp-ban/ Advisory report: https://security.dxw.com/advisories/vulnerability-in-wp-ban-allows-visitors-to-bypass-the-ip-blacklist-in-some-configurations/ CVE: CVE-2014-6230 CVSS: 5 (Medium; AV:N/AC:L/Au:N/C:P/I:N/A:N)

Description

Vulnerability in WP-Ban allows visitors to bypass the IP blacklist in some configurations

Vulnerability

This plugin allows blacklisting users based on their IP address, however it takes the IP address from the X-Forwarded-For header if available. Not all Web server configurations will strip or replace X-Forwarded-For headers – in which case the IP ban can be bypassed by sending this header. This plugin therefore only works in certain configurations, but does not warn admins of this fact.

Proof of concept

Visit http://localhost/wp-admin/admin.php?page=wp-ban/ban-options.php Set “Banned IPs” to “127.0.0.1″ Execute “curl http://localhost/\"; and see the “You Are Banned” message Execute “curl http://localhost/ -H \’X-Forwarded-For: 999.999.999.999\’\" and see that it displays the page

Note that this will not work if your Web server sets or strips X-Forwarded-For headers. (To remove the IP blacklist run this SQL: “delete from wp_options where option_name=\’banned_ips\’;\")

Mitigations

Upgrade to version 1.6.4 or later. If a reverse-proxy is used, check the “I am using a reverse proxy” box in the plugin settings, and ensure that X-Forwarded-For headers are being set even if the request already contains an X-Forwarded-For header.

Disclosure policy

dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://security.dxw.com/disclosure/

Please contact us on security () dxw com to acknowledge this report if you received it via a third party (for example, plugins () wordpress org) as they generally cannot communicate with us on your behalf.

This vulnerability will be published if we do not receive a response to this report with 14 days.

Timeline

2014-08-27: Discovered 2014-09-04: Reported to vendor by email 2014-09-04: Requested CVE 2014-09-04: Vendor responded 2014-09-17: Vendor reported a fixed version released 2014-09-17: Published

Discovered by dxw:

Tom Adams Please visit security.dxw.com for more information.

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