CVE-2003-0965 in Mailman
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the admin CGI script for Mailman before 2.1.4 allows remote attackers to steal session cookies and conduct unauthorized activities.
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Analysis
by VulDB Data Team • 09/03/2019
The vulnerability identified as CVE-2003-0965 represents a critical cross-site scripting flaw within the administrative CGI script of the Mailman mailing list management system. This vulnerability affects versions prior to 2.1.4 and exposes the system to remote code execution through maliciously crafted input parameters. The flaw resides in the administrative interface where user-supplied data is not properly sanitized before being rendered back to the browser, creating an avenue for attackers to inject malicious scripts. The administrative CGI script serves as the primary interface for managing mailing lists and user accounts, making it a prime target for exploitation. When administrators interact with the vulnerable system, they become susceptible to session hijacking attacks that can result in complete compromise of the mailing list management infrastructure.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the Mailman administrative interface. Specifically, the CGI script fails to properly escape or sanitize user-controllable parameters that are subsequently reflected in HTML output without appropriate security measures. This creates an environment where malicious payloads can be executed within the context of an authenticated administrator's browser session. The vulnerability aligns with CWE-79, which categorizes cross-site scripting as a code injection flaw occurring when untrusted data is sent to a web browser without proper validation or encoding. Attackers can craft malicious URLs containing script code that gets executed when administrators view the affected pages, potentially stealing session cookies or performing unauthorized administrative actions.
The operational impact of this vulnerability extends beyond simple session theft, as it provides attackers with elevated privileges within the mailing list management system. Once an attacker successfully exploits this vulnerability, they can access sensitive administrative functions such as creating new mailing lists, modifying user permissions, and accessing confidential mailing list data. The stolen session cookies enable persistent access to the administrative interface without requiring additional authentication, allowing for long-term compromise of the system. This vulnerability particularly affects organizations that rely heavily on Mailman for email communications, as compromise of the administrative interface can lead to widespread disruption of email services and potential data breaches. The attack vector is particularly concerning because it requires minimal technical expertise to exploit and can be automated through various reconnaissance techniques.
Mitigation strategies for this vulnerability should focus on immediate patching of the Mailman system to version 2.1.4 or later, where the XSS flaws have been addressed through proper input validation and output encoding mechanisms. Organizations should implement comprehensive input sanitization measures that ensure all user-supplied data is properly escaped before being rendered in HTML contexts. The implementation of Content Security Policy headers can provide additional defense-in-depth against script execution, while regular security audits of web applications should verify proper encoding practices throughout the codebase. Network segmentation and monitoring of administrative access patterns can help detect potential exploitation attempts. This vulnerability demonstrates the critical importance of input validation in web applications and aligns with ATT&CK technique T1566, which covers the exploitation of web application vulnerabilities for unauthorized access. Organizations should also consider implementing multi-factor authentication for administrative accounts and regular security training for system administrators to reduce the risk of successful exploitation.