CVE-2024-9647 in Kama SpamBlock Plugin
Summary
by MITRE • 10/16/2024
The Kama SpamBlock plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via $_POST values in all versions up to, and including, 1.8.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 03/05/2025
The CVE-2024-9647 vulnerability affects the Kama SpamBlock plugin for WordPress, representing a critical security flaw that undermines the integrity of web applications. This vulnerability exists within the plugin's handling of user input through POST parameters, specifically in versions up to and including 1.8.2, making it a widespread concern for WordPress administrators who rely on this spam protection tool. The flaw stems from inadequate sanitization of user-supplied data and insufficient output escaping mechanisms, creating an environment where malicious actors can exploit the system's trust in legitimate input processing.
The technical implementation of this vulnerability allows attackers to execute reflected cross-site scripting attacks by manipulating POST request parameters that are not properly validated or escaped before being rendered in web pages. This type of attack falls under the common weakness enumeration CWE-79, which specifically addresses improper neutralization of input during web page generation. The vulnerability operates by injecting malicious scripts into web pages that are then executed in the victim's browser when they interact with the compromised application. The reflected nature of the attack means that the malicious script is reflected back from the server in response to the user's request, making it particularly dangerous as it can be delivered through various vectors including phishing emails or malicious links.
The operational impact of this vulnerability extends beyond simple script execution, as it creates potential pathways for more sophisticated attacks that could compromise user sessions, steal sensitive information, or redirect users to malicious websites. Attackers can leverage this vulnerability to perform session hijacking, steal cookies, or inject malicious payloads that persist across user sessions. The unauthenticated nature of the attack means that no prior access or credentials are required to exploit the vulnerability, making it particularly attractive to threat actors seeking to maximize their attack surface. This vulnerability directly aligns with attack techniques described in the MITRE ATT&CK framework under the T1059.001 technique for command and scripting interpreter, where attackers can use reflected XSS to execute malicious scripts in the victim's browser environment.
Mitigation strategies for CVE-2024-9647 should prioritize immediate plugin updates to versions that address the input sanitization and output escaping deficiencies. System administrators should implement comprehensive input validation mechanisms that sanitize all user-supplied data before processing, ensuring that potentially malicious payloads are neutralized before any output is generated. The implementation of Content Security Policy headers can provide additional protection layers that prevent the execution of unauthorized scripts even if the primary vulnerability is exploited. Organizations should also consider implementing web application firewalls that can detect and block suspicious POST request patterns associated with XSS attacks. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other plugins or custom code implementations, as this vulnerability demonstrates how insufficient input validation can create persistent security risks in WordPress environments.