CVE-2011-1948 in Plone
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Plone 4.1 and earlier allows remote attackers to inject arbitrary web script or HTML via a crafted URL.
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Analysis
by VulDB Data Team • 11/08/2021
The CVE-2011-1948 vulnerability represents a critical cross-site scripting flaw discovered in Plone content management systems version 4.1 and earlier. This vulnerability resides in the application's handling of user-supplied URL parameters, creating an avenue for remote attackers to execute malicious scripts within the context of other users' browsers. The flaw specifically manifests when the system fails to properly sanitize or encode input data that is subsequently rendered in web pages, allowing attackers to inject malicious code through carefully crafted URLs. The vulnerability impacts the core security model of Plone by potentially enabling unauthorized actions such as session hijacking, data theft, or unauthorized content modification. This issue falls under the CWE-79 category of Cross-site Scripting, which is classified as a fundamental web application security weakness that affects the integrity and confidentiality of web-based systems.
The technical implementation of this vulnerability exploits the lack of proper input validation and output encoding mechanisms within Plone's URL processing pipeline. When users navigate to a specially crafted URL containing malicious script payloads, the application processes these parameters without adequate sanitization before displaying them in the browser context. This allows attackers to inject HTML tags, javascript code, or other malicious content that executes in the victim's browser session. The vulnerability is particularly dangerous because it operates entirely through HTTP requests, requiring no privileged access or authentication to exploit. Attackers can leverage this weakness to perform session manipulation, steal cookies, redirect users to malicious sites, or even modify content within the Plone environment. The attack vector is classified as a reflected XSS vulnerability since the malicious script is reflected back to the user through the application's response to the crafted URL.
The operational impact of CVE-2011-1948 extends beyond simple script injection, as it represents a significant threat to the overall security posture of Plone installations. Organizations using affected versions face potential data breaches, unauthorized access to administrative functions, and compromise of user sessions. The vulnerability can be exploited to create persistent threats through the injection of malicious scripts that execute in the context of legitimate users, potentially leading to privilege escalation or lateral movement within the application environment. Security professionals must consider the implications of this vulnerability in relation to broader attack frameworks such as those described in the MITRE ATT&CK matrix, where this flaw could enable initial access and persistence phases of an attack lifecycle. The vulnerability affects not just individual user experiences but the entire application infrastructure, as compromised user sessions can be leveraged to gain deeper access to the system.
Mitigation strategies for CVE-2011-1948 require immediate attention through software updates and proper input validation implementation. The most effective solution involves upgrading to Plone versions that have patched this vulnerability, as version 4.2 and later contain the necessary security fixes. Organizations should implement comprehensive input sanitization measures that validate and encode all user-supplied data before processing or rendering. This includes implementing proper HTML escaping mechanisms and content security policies to prevent script execution in response to user input. Network-level protections such as web application firewalls can provide additional defense in depth, though they should not replace proper application-level fixes. Security teams should also conduct regular vulnerability assessments and penetration testing to identify similar weaknesses in other applications within their environment. The remediation process must include thorough testing to ensure that the applied fixes do not introduce regressions in application functionality while maintaining the security posture against similar XSS vulnerabilities.