CVE-2009-0877 in Java System Communications Express
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Sun Java System Communications Express allow remote attackers to inject arbitrary web script or HTML via the (1) Full Name or (2) Subject field.
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Analysis
by VulDB Data Team • 12/11/2017
The vulnerability identified as CVE-2009-0877 represents a critical cross-site scripting flaw within Sun Java System Communications Express, a comprehensive web-based email and collaboration platform. This vulnerability resides in the application's input validation mechanisms, specifically targeting the Full Name and Subject fields of email communications. The flaw allows remote attackers to inject malicious scripts that can execute within the context of other users' browsers, potentially compromising the security of the entire communication system. Such vulnerabilities are particularly dangerous in enterprise environments where email systems serve as primary communication channels and contain sensitive business information.
The technical implementation of this vulnerability stems from insufficient sanitization of user input in the web interface components of the communications express platform. When users enter data into the Full Name or Subject fields, the application fails to properly validate or escape special characters that could be interpreted as HTML or JavaScript code. This weakness creates an environment where attackers can craft malicious payloads that are stored and subsequently executed when other users view the affected messages. The vulnerability manifests as a classic reflected XSS attack vector, where the malicious code is injected into the application's response and executed in the victim's browser context. According to CWE guidelines, this corresponds to CWE-79 which categorizes improper neutralization of input during web page generation, making it a direct implementation of the common web application security flaw.
The operational impact of this vulnerability extends far beyond simple script execution, potentially enabling attackers to perform session hijacking, steal sensitive information, redirect users to malicious websites, or even gain unauthorized access to the email system. In enterprise settings, where Communications Express serves as a critical communication infrastructure, an attacker could exploit this vulnerability to monitor sensitive email communications, compromise user credentials, or establish persistent access points within the organization's network. The attack surface is particularly concerning because email systems are typically accessed by multiple users with varying levels of security clearance, making the potential for information leakage and privilege escalation substantial. This vulnerability directly aligns with ATT&CK technique T1566 which describes the use of malicious web content to compromise systems, and T1078 which covers legitimate account use to maintain access.
Mitigation strategies for CVE-2009-0877 should focus on implementing robust input validation and output encoding mechanisms throughout the application's user interface components. Organizations should deploy proper HTML escaping routines for all user-supplied data before rendering it in web pages, ensuring that special characters are properly encoded to prevent script execution. The implementation of Content Security Policy (CSP) headers can provide an additional layer of protection by restricting the sources from which scripts can be loaded and executed within the application context. Regular security updates and patches from Oracle, as well as comprehensive input validation across all web application components, are essential remediation measures. Additionally, organizations should consider implementing web application firewalls to detect and block suspicious input patterns that may indicate XSS attack attempts. Security awareness training for administrators and users can also help identify potential exploitation attempts, while network monitoring solutions should be configured to detect anomalous traffic patterns that may indicate exploitation of this vulnerability.