CVE-2004-0671 in Brightmail AntiSpam
Summary
by MITRE
Brightmail Spamfilter 6.0 and earlier beta releases allows remote attackers to read mail from other users by modifying the id parameter in a viewMsgDetails.do request.
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Analysis
by VulDB Data Team • 09/20/2024
The vulnerability identified as CVE-2004-0671 affects Brightmail Spamfilter versions 6.0 and earlier beta releases, representing a critical access control flaw that enables remote attackers to bypass authentication mechanisms and access confidential email communications. This issue stems from insufficient input validation within the web-based administrative interface, specifically within the viewMsgDetails.do servlet component that handles message detail requests. The flaw manifests when the application fails to properly validate the id parameter, allowing malicious actors to manipulate this parameter and gain unauthorized access to messages belonging to other users within the system.
The technical implementation of this vulnerability demonstrates a classic case of insecure direct object reference, classified under CWE-639, where the application directly uses user-supplied input to reference internal objects without proper authorization checks. When an attacker submits a modified id parameter to the viewMsgDetails.do endpoint, the system processes the request without verifying whether the requesting user has legitimate access rights to the specified message. This weakness operates at the application logic level, where the authentication and authorization mechanisms fail to enforce proper access controls between users and their respective email messages, creating a path for privilege escalation and data disclosure.
The operational impact of this vulnerability extends beyond simple information disclosure, as it compromises the fundamental security posture of email systems that rely on Brightmail Spamfilter for content filtering and spam protection. Attackers can potentially access sensitive communications, personal data, and confidential business information belonging to other users, leading to privacy violations, intellectual property theft, and potential regulatory compliance violations. The remote nature of the attack means that threat actors can exploit this vulnerability from any location without requiring physical access to the system or insider knowledge, making it particularly dangerous for organizations that handle sensitive communications. This vulnerability directly violates the principles of confidentiality and integrity as outlined in the CIA triad and represents a significant breach in the security model of email filtering systems.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and access control mechanisms within the affected application. Organizations should immediately upgrade to Brightmail Spamfilter versions that address this vulnerability, as the vendor likely released patches or updates to fix the insecure direct object reference issue. The recommended approach involves implementing robust parameter validation that checks user permissions before allowing access to message details, along with proper session management and authentication verification processes. Security teams should also consider implementing network-level controls such as web application firewalls to detect and block suspicious parameter modifications, while establishing monitoring procedures to identify unauthorized access attempts. This vulnerability aligns with attack patterns described in the attack tree methodology, specifically representing a path where attackers can leverage weak access controls to achieve unauthorized information disclosure, making it a critical target for immediate remediation and security hardening efforts.