CVE-2012-5504 in Plone
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in widget_traversal.py in Plone before 4.2.3 and 4.3 before beta 1 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 03/13/2019
The CVE-2012-5504 vulnerability represents a critical cross-site scripting flaw discovered in the Plone content management system, specifically within the widget_traversal.py module. This vulnerability affects Plone versions prior to 4.2.3 and 4.3 beta 1, making it a significant security concern for organizations relying on these older versions. The flaw enables remote attackers to execute malicious web scripts or HTML code within the context of a victim's browser, potentially compromising user sessions and data integrity. The vulnerability's impact extends beyond simple script injection as it can be leveraged to perform session hijacking, deface websites, or redirect users to malicious sites, fundamentally undermining the security posture of affected Plone installations.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the widget_traversal.py component, which handles traversal operations for Plone's widget system. This component processes user-supplied data without proper sanitization, allowing malicious payloads to be injected through unspecified vectors that likely involve form inputs, URL parameters, or widget configuration settings. The vulnerability manifests when the system fails to properly escape or validate data before rendering it in web pages, creating an opening for attackers to inject malicious scripts. According to CWE classification, this vulnerability maps to CWE-79: Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly encode output to prevent XSS attacks. The attack surface is particularly concerning as it operates within the core traversal mechanism that governs how Plone processes user interactions with its widget-based interface components.
The operational impact of CVE-2012-5504 extends far beyond simple data corruption or display issues, as it provides attackers with the capability to manipulate user sessions and compromise the integrity of Plone applications. Attackers can leverage this vulnerability to steal session cookies, execute unauthorized administrative actions, or modify content within the CMS, potentially leading to complete system compromise. The vulnerability's remote nature means that attackers do not require local access or authentication to exploit it, making it particularly dangerous for publicly accessible Plone installations. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, and T1531 for Account Access Removal, as it enables attackers to establish persistent access through session manipulation. Organizations running affected Plone versions face significant risk of data breaches, reputation damage, and regulatory compliance violations, particularly in environments where sensitive information is managed through the CMS.
Mitigation strategies for CVE-2012-5504 primarily focus on immediate version upgrades to Plone 4.2.3 or later releases, which contain the necessary patches to address the XSS vulnerability. System administrators should prioritize the deployment of security updates and conduct thorough testing to ensure compatibility with existing customizations and extensions. Additionally, implementing proper input validation frameworks and output encoding mechanisms can provide defense-in-depth measures against similar vulnerabilities. Organizations should also consider deploying web application firewalls to detect and block malicious payloads attempting to exploit this vulnerability. The remediation process should include comprehensive vulnerability scanning of all Plone installations to identify systems running affected versions, followed by immediate patching or isolation of vulnerable systems. Security monitoring should be enhanced to detect suspicious user activity patterns that might indicate exploitation attempts, and access controls should be reviewed to minimize potential impact from successful attacks. Regular security assessments and vulnerability management processes should be implemented to prevent similar issues from emerging in the future, with particular attention to input validation and output encoding practices throughout the application stack.