Description

The Banhammer – Monitor Site Traffic, Block Bad Users and Bots plugin for WordPress is vulnerable to Blocking Bypass in all versions up to, and including, 3.4.8. This is due to a site-wide “secret key” being deterministically generated from a constant character set using md5() and base64_encode() and then stored in the `banhammer_secret_key` option. This makes it possible for unauthenticated attackers to bypass the plugin’s logging and blocking by appending a GET parameter named `banhammer-process_{SECRET}` where `{SECRET}` is the predictable value, thereby causing Banhammer to abort its protections for that request.

Weaknesses 1

References 5

• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/banhammer/trunk/inc/banhammer-core.php#L101
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/banhammer/trunk/inc/banhammer-functions.php#L336
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3365087%40banhammer&new=3365087%40banhammer&sfp_email=&sfph_mail=
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3365979%40banhammer&new=3365979%40banhammer&sfp_email=&sfph_mail=
• wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/97c46a13-6981-426f-b24a-c9820657042f?source=cve

Remediation