CVE-2014-8364 in Wordpress Spreadsheet Plugin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in ss_handler.php in the WordPress Spreadsheet (wpSS) plugin 0.62 for WordPress allows remote attackers to inject arbitrary web script or HTML via the ss_id parameter.
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Analysis
by VulDB Data Team • 03/30/2022
The CVE-2014-8364 vulnerability represents a classic cross-site scripting flaw within the WordPress Spreadsheet plugin version 0.62, specifically affecting the ss_handler.php component. This vulnerability falls under the CWE-79 category of Cross-Site Scripting and operates as an input validation failure where user-supplied data is not properly sanitized before being rendered in web pages. The flaw manifests through the ss_id parameter which serves as an entry point for malicious actors to inject arbitrary HTML or JavaScript code into the application's response.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing crafted script payloads within the ss_id parameter value. When the vulnerable WordPress site processes this request through the ss_handler.php script, the unsanitized parameter value gets embedded directly into the HTML response without proper output encoding or filtering. This creates an environment where any user who views the affected page becomes vulnerable to executing malicious scripts in their browser context, potentially leading to session hijacking, credential theft, or redirection to malicious sites.
The operational impact of CVE-2014-8364 extends beyond simple script injection as it enables attackers to leverage the compromised WordPress installation for more sophisticated attacks. The vulnerability can be exploited through various vectors including social engineering campaigns where users are tricked into clicking malicious links, or through automated scanning tools that identify vulnerable WordPress installations. Given that the WordPress Spreadsheet plugin was widely used, this vulnerability created a significant attack surface for threat actors targeting WordPress environments. The attack pattern aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1059.001 for command and control through script injection.
Mitigation strategies for this vulnerability involve immediate patching of the WordPress Spreadsheet plugin to version 0.63 or later, which contains the necessary input sanitization fixes. Administrators should also implement proper output encoding mechanisms for all user-supplied parameters and establish comprehensive input validation routines. The remediation process should include reviewing all plugin installations for similar vulnerabilities and implementing Content Security Policy headers to limit script execution capabilities. Additionally, regular security audits and penetration testing of WordPress installations can help identify and remediate similar issues before they can be exploited by attackers. Organizations should also consider implementing web application firewalls to detect and block malicious payloads targeting known XSS vulnerabilities in their WordPress environments.