CVE-2012-5494 in Plone
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in python_scripts.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, related to "{u,}translate."
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Analysis
by VulDB Data Team • 03/13/2019
The CVE-2012-5494 vulnerability represents a critical cross-site scripting flaw discovered in the Plone content management system affecting versions prior to 4.2.3 and 4.3 beta 1. This vulnerability specifically targets the python_scripts.py component within Plone's architecture, exposing the system to remote code execution through malicious web script injection. The flaw manifests when the system processes translation-related functionality, particularly involving the {u,}translate constructs that are commonly used for internationalization purposes. The vulnerability stems from insufficient input validation and sanitization of user-supplied data that flows through the translation mechanisms, creating an exploitable path for attackers to inject malicious content into web pages served by the Plone application. This issue falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent web application security vulnerabilities documented in the CWE database. The attack vector leverages the translation functionality to bypass normal security controls, making it particularly insidious as it operates within legitimate application pathways that are typically trusted by security mechanisms.
The technical exploitation of this vulnerability occurs when attackers can manipulate translation parameters or strings that are processed by the python_scripts.py module. The {u,}translate syntax in Plone's templating system creates an environment where user input can be directly embedded into rendered HTML output without proper sanitization. When the application processes these translation elements, it fails to adequately escape or filter potentially malicious content that may be present in translation dictionaries or user-provided translation strings. This allows attackers to inject HTML tags, javascript code, or other malicious payloads that execute in the context of other users' browsers. The vulnerability is particularly concerning because it can be exploited through various vectors including user-generated content, administrative interfaces, or even through crafted URLs that leverage the translation functionality. The attack chain typically involves an attacker submitting malicious input through a translation parameter, which then gets processed by the vulnerable python_scripts.py module and subsequently rendered in web pages viewed by other users, creating a persistent XSS attack vector.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it can enable attackers to establish persistent access to user sessions, steal sensitive information, or manipulate the application's functionality. Users who view compromised pages become victims of the XSS attack, potentially leading to session hijacking, credential theft, or further exploitation through more sophisticated attack chains. The vulnerability affects both authenticated and unauthenticated attackers, making it particularly dangerous in environments where Plone is used for public-facing websites or collaborative platforms. Organizations running affected Plone versions face significant risk of unauthorized access, data compromise, and potential regulatory violations, especially in industries subject to compliance requirements such as healthcare, finance, or government sectors. The attack can be amplified through social engineering techniques where attackers craft malicious translation strings that appear legitimate to end users, increasing the likelihood of successful exploitation and reducing the chance of detection by security monitoring systems.
Mitigation strategies for CVE-2012-5494 require immediate implementation of the vendor-provided patches and updates to Plone versions 4.2.3 and 4.3 beta 1 or later. Organizations should conduct comprehensive vulnerability assessments to identify all instances of affected Plone installations within their infrastructure and prioritize remediation efforts. Security teams must implement additional input validation measures, particularly for translation parameters and user-supplied content, ensuring that all data flowing through the python_scripts.py module undergoes proper sanitization and escaping before rendering. The implementation of Content Security Policies (CSP) can provide additional protection layers against XSS attacks by restricting the sources from which scripts can be executed within the application context. Regular security monitoring and code reviews should focus on translation handling mechanisms to prevent similar vulnerabilities from emerging in future development cycles. This vulnerability also highlights the importance of following secure coding practices and adhering to the ATT&CK framework's guidance on web application security, particularly in areas related to input validation, output encoding, and privilege separation. Organizations should consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability class, while maintaining detailed logging of translation-related activities for forensic analysis purposes.