CVE-2012-4271 in Bad Behavior
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in bad-behavior-wordpress-admin.php in the Bad Behavior plugin before 2.0.47 and 2.2.x before 2.2.5 for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) PATH_INFO, (2) httpbl_key, (3) httpbl_maxage, (4) httpbl_threat, (5) reverse_proxy_addresses, or (6) reverse_proxy_header parameter.
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Analysis
by VulDB Data Team • 01/24/2018
The CVE-2012-4271 vulnerability represents a critical cross-site scripting flaw in the Bad Behavior WordPress plugin, a security tool designed to protect websites from various malicious activities including spam and bot attacks. This vulnerability affects versions prior to 2.0.47 and 2.2.x prior to 2.2.5, making it a significant concern for WordPress administrators who rely on this plugin for security protection. The flaw exists within the bad-behavior-wordpress-admin.php file, which handles administrative functions of the plugin, creating a potential attack vector that could compromise the security of WordPress installations.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the plugin's administrative interface. Attackers can exploit this weakness by injecting malicious scripts through six specific parameters including PATH_INFO, httpbl_key, httpbl_maxage, httpbl_threat, reverse_proxy_addresses, and reverse_proxy_header. These parameters are typically used for configuration and monitoring purposes within the plugin's security mechanisms, but they fail to properly sanitize user input before rendering it in the web interface. This lack of proper sanitization allows attackers to execute arbitrary JavaScript code in the context of authenticated admin sessions, effectively bypassing the security measures the plugin is supposed to provide.
The operational impact of this vulnerability is particularly severe as it enables attackers to gain unauthorized access to WordPress administrative interfaces. When exploited, the XSS attack could allow malicious actors to modify plugin settings, inject malicious code into the WordPress administration panel, or even escalate privileges to full administrator access. The vulnerability is especially dangerous because it targets the plugin's administrative functionality, meaning that successful exploitation could lead to complete compromise of the WordPress installation. Security researchers have classified this issue as a high-risk vulnerability due to its potential for privilege escalation and the ease with which it can be exploited through simple parameter manipulation.
This vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates how input validation failures can create persistent security weaknesses in content management systems. From an ATT&CK framework perspective, this vulnerability maps to T1059.007 for Command and Scripting Interpreter, specifically JavaScript, and T1548.001 for Abuse of Functionality, where attackers leverage legitimate administrative tools to perform malicious activities. The attack surface is broad as it affects multiple parameter inputs, making it difficult for administrators to fully protect against all potential exploitation vectors without proper patching. Organizations should immediately update to the patched versions of the Bad Behavior plugin and implement additional security measures such as web application firewalls and regular security audits to prevent exploitation of this vulnerability.