CVE-2001-0940 in Firewall-1
Summary
by MITRE
Buffer overflow in the GUI authentication code of Check Point VPN-1/FireWall-1 Management Server 4.0 and 4.1 allows remote attackers to execute arbitrary code via a long user name.
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Analysis
by VulDB Data Team • 04/09/2019
The vulnerability identified as CVE-2001-0940 represents a critical buffer overflow flaw within the graphical user interface authentication subsystem of Check Point VPN-1/FireWall-1 Management Server versions 4.0 and 4.1. This issue stems from inadequate input validation mechanisms that fail to properly sanitize user-provided credentials during the authentication process. The flaw specifically manifests when the system processes excessively long user names, causing memory corruption that can be exploited by remote attackers to gain unauthorized system access. The vulnerability operates at the application layer and affects the management server component, which serves as the central control point for firewall policies and security configurations.
The technical implementation of this buffer overflow occurs within the GUI authentication code where user name inputs are handled without proper bounds checking. When an attacker submits a user name exceeding the allocated buffer size, the excess data overflows into adjacent memory regions, potentially overwriting critical program variables, return addresses, or function pointers. This memory corruption can be manipulated to redirect program execution flow, allowing attackers to inject and execute arbitrary code with the privileges of the affected service account. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which represents a well-known class of memory safety issues that have been extensively documented in cybersecurity literature and pose significant risks to system integrity.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete control over the management server, which typically holds administrative privileges and contains sensitive security policy configurations. Successful exploitation could result in unauthorized access to network security policies, modification of firewall rules, data exfiltration, and potential lateral movement within the network infrastructure. The remote nature of the attack means that adversaries can exploit this vulnerability from outside the network perimeter without requiring physical access or prior authentication. This makes the vulnerability particularly dangerous for organizations that rely on centralized security management systems, as compromise of the management server can lead to complete network security infrastructure failure. The vulnerability also aligns with ATT&CK technique T1078.004 for valid accounts and T1566.001 for spearphishing attachments, as it enables attackers to leverage compromised management credentials for further infiltration.
Mitigation strategies for CVE-2001-0940 should prioritize immediate patch deployment from Check Point, as the vendor would have released security updates addressing the buffer overflow in subsequent versions. Organizations should implement network segmentation to isolate management servers from general network traffic, employ network monitoring solutions to detect anomalous authentication patterns, and establish strict input validation policies for all user interface components. Additionally, implementing intrusion detection systems with signature-based detection for known exploit patterns and maintaining up-to-date security baselines for management server configurations can help reduce the attack surface. The vulnerability underscores the importance of regular security assessments and vulnerability management programs, as it demonstrates how legacy systems with insufficient input validation can become primary attack vectors for sophisticated adversaries seeking to compromise enterprise security infrastructure. Organizations should also consider implementing multi-factor authentication mechanisms and privilege separation to limit the impact of potential authentication bypasses.