CVE-2000-0807 in Firewall-1
Summary
by MITRE
The OPSEC communications authentication mechanism (fwn1) in Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to spoof connections, aka the "OPSEC Authentication Vulnerability."
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Analysis
by VulDB Data Team • 04/06/2019
The CVE-2000-0807 vulnerability represents a critical flaw in the OPSEC communications authentication mechanism of Check Point VPN-1/FireWall-1 versions 4.1 and earlier. This vulnerability specifically targets the fwn1 component responsible for secure communications between firewall components, creating a significant security weakness that enables unauthorized access to network infrastructure. The flaw resides in the authentication protocol implementation, where the system fails to properly validate the identity of communicating parties, allowing malicious actors to establish fraudulent connections within the network security framework. This issue directly impacts the integrity of the firewall's security model and compromises the trust relationships between network components.
The technical exploitation of this vulnerability occurs through the manipulation of authentication tokens and session identifiers within the OPSEC communication channel. Attackers can craft specially formatted packets that bypass the normal authentication process, effectively impersonating legitimate firewall components or authorized users. The vulnerability stems from inadequate cryptographic validation and weak session management within the fwn1 module, allowing attackers to forge authentication messages that appear legitimate to the receiving system. This weakness enables man-in-the-middle attacks where malicious actors can intercept, modify, or redirect traffic while maintaining the appearance of legitimate communication. The flaw specifically relates to improper implementation of cryptographic protocols and authentication mechanisms that should have prevented unauthorized access to the firewall's internal communication channels.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it fundamentally undermines the security posture of organizations relying on Check Point firewalls. Attackers who successfully exploit this vulnerability can gain access to sensitive network information, manipulate firewall configurations, and potentially establish persistent access points within the network infrastructure. The ability to spoof connections means that malicious actors can infiltrate the internal network without detection, as their communications appear to originate from legitimate firewall components. This vulnerability creates a backdoor that allows attackers to bypass traditional network security controls and potentially escalate privileges within the firewall environment. Organizations may experience unauthorized data access, network disruption, and complete compromise of their firewall-based security controls, leading to broader network infiltration and data breaches.
Mitigation strategies for this vulnerability require immediate implementation of patches provided by Check Point, as the flaw affects core authentication mechanisms that cannot be adequately protected through configuration changes alone. Organizations should implement network segmentation to limit the impact of potential exploitation and establish monitoring protocols to detect unusual communication patterns within their firewall infrastructure. The vulnerability aligns with CWE-287, which addresses improper authentication issues in security systems, and maps to ATT&CK technique T1078 for valid accounts and T1566 for phishing attacks that could leverage this weakness. Network administrators must also consider implementing additional authentication layers, such as multi-factor authentication for firewall management interfaces, and conduct comprehensive security assessments to identify any potential exploitation attempts. Regular security updates and vulnerability management processes become critical to prevent similar issues in future versions of the software, as this vulnerability demonstrates the importance of robust authentication mechanisms in network security infrastructure.