CVE-2006-4014 in Brightmail AntiSpam
Summary
by MITRE
Symantec Brightmail AntiSpam (SBAS) before 6.0.4, when the Control Center is allowed to connect from any computer, allows remote attackers to cause a denial of service (application freeze) "by sending invalid posts".
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Analysis
by VulDB Data Team • 06/24/2019
The vulnerability identified as CVE-2006-4014 affects Symantec Brightmail AntiSpam version 6.0.3 and earlier, representing a critical security flaw that enables remote attackers to disrupt service availability through crafted malicious input. This issue specifically impacts the Control Center component of the Brightmail AntiSpam system, which serves as the administrative interface for managing spam filtering policies and monitoring system operations. The vulnerability stems from insufficient input validation mechanisms within the Control Center's web interface, creating an exploitable condition where malformed HTTP POST requests can trigger system instability.
The technical exploitation of this vulnerability occurs when an attacker sends specially crafted invalid POST requests to the Control Center interface, which is configured to accept connections from any computer. This configuration represents a significant security misconfiguration that violates the principle of least privilege, as it allows unrestricted remote access to administrative functions without proper authentication or access controls. The flaw manifests as an application freeze, effectively causing a denial of service condition that renders the Brightmail AntiSpam system unavailable to legitimate users and administrators. The vulnerability operates at the application layer, specifically targeting the web application's request processing logic, and can be classified under CWE-20 as "Improper Input Validation" with associated ATT&CK techniques including T1499.1 for Network Denial of Service and T1190 for Exploit Public-Facing Application.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise the email security infrastructure that organizations rely upon for protecting against spam and malicious email content. When the Control Center becomes unresponsive, administrators lose the ability to monitor spam filtering effectiveness, adjust security policies, or respond to emerging threats in real-time. This creates a window of vulnerability where the organization's email system becomes less effective at filtering malicious content while administrators are unable to perform necessary maintenance or configuration updates. The attack vector is particularly concerning because it requires no authentication credentials, making it accessible to any remote attacker who can reach the system's network interface, and the impact is immediate and severe without requiring complex exploitation techniques.
Organizations should implement immediate mitigations including restricting access to the Control Center interface to trusted administrative networks only, implementing proper access controls and authentication mechanisms, and applying the vendor-provided patch version 6.0.4 which addresses the input validation issues. Network segmentation and firewall rules should be configured to limit access to the Control Center ports and services to authorized administrative workstations only. Additionally, implementing intrusion detection systems and monitoring for unusual POST request patterns can help detect potential exploitation attempts. The vulnerability highlights the importance of proper input validation in web applications and demonstrates how seemingly simple security misconfigurations can lead to severe operational impacts. Organizations should also consider implementing automated patch management processes to ensure timely deployment of security updates and maintain a comprehensive understanding of their attack surface through regular vulnerability assessments and penetration testing activities.