CVE-2021-36737 in Pluto
Summary
by MITRE • 01/06/2022
The input fields of the Apache Pluto UrlTestPortlet are vulnerable to Cross-Site Scripting (XSS) attacks. Users should migrate to version 3.1.1 of the v3-demo-portlet.war artifact
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Analysis
by VulDB Data Team • 01/09/2022
The Apache Pluto portal container framework contains a cross-site scripting vulnerability in its UrlTestPortlet component that allows remote attackers to inject malicious scripts into web pages viewed by other users. This vulnerability exists within the input handling mechanisms of the portlet's URL parameter processing functionality, where user-supplied data is not properly sanitized or validated before being rendered in web responses. The flaw specifically affects the UrlTestPortlet which is designed to test URL handling within the portal environment but inadvertently exposes the system to XSS attacks through improper input validation.
The technical implementation of this vulnerability stems from insufficient sanitization of URL parameters passed to the portlet's input fields. When users provide malicious input through URL parameters, the system fails to properly encode or escape special characters before incorporating them into HTML output, creating an environment where attacker-controlled scripts can execute in the context of other users' browsers. This type of vulnerability falls under the CWE-79 category for Cross-Site Scripting, specifically representing a failure to sanitize user input before rendering it in web pages. The vulnerability enables attackers to perform various malicious activities including session hijacking, defacement of portal content, or redirection to malicious sites.
The operational impact of this vulnerability extends beyond simple script execution as it can compromise the entire portal security model. An attacker could leverage this XSS flaw to steal user session cookies, modify portal content, or redirect users to phishing sites that appear legitimate within the trusted portal environment. This creates a significant risk for organizations relying on Apache Pluto for enterprise portal solutions, as the vulnerability could be exploited to gain unauthorized access to sensitive information or disrupt portal operations. The attack vector is particularly concerning because it requires minimal privileges and can be executed through standard web browser interactions, making it accessible to a wide range of threat actors.
Organizations affected by this vulnerability should immediately implement the recommended mitigation by migrating to version 3.1.1 of the v3-demo-portlet.war artifact, which contains the necessary security patches and input validation improvements. This upgrade addresses the root cause by implementing proper input sanitization and output encoding mechanisms that prevent malicious scripts from being executed. Additionally, administrators should consider implementing web application firewalls and content security policies to provide additional layers of protection. The vulnerability demonstrates the importance of proper input validation and output encoding practices as outlined in the OWASP Top Ten and MITRE ATT&CK framework's application layer attacks category, where XSS vulnerabilities represent one of the most prevalent and dangerous web application security flaws. Security teams should also conduct thorough testing to ensure no other portlets within the Apache Pluto framework contain similar vulnerabilities and implement comprehensive monitoring for suspicious user activity patterns.