CVE-2003-1379 in Clarkconnect Linux
Summary
by MITRE
clarkconnectd in ClarkConnect Linux 1.2 allows remote attackers to obtain sensitive information about the server via the characters (1) A, which reveals the date and time, (2) F, (3) M, which reveals ifconfig information, (4) P, which lists the processes, (5) Y, which reveals the snort log files, or (6) b, which reveals /var/log/messages.
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Analysis
by VulDB Data Team • 07/14/2025
The vulnerability identified as CVE-2003-1379 affects the clarkconnectd service running on ClarkConnect Linux version 1.2, representing a significant information disclosure weakness that exposes critical system details to remote attackers. This service operates as a daemon responsible for managing various network connectivity functions within the ClarkConnect environment, but it fails to implement proper authentication mechanisms or input validation for its command interface. The flaw manifests when remote attackers send specific single-character commands to the service, which then respond with detailed system information without requiring any authentication credentials. This vulnerability directly maps to CWE-200, which describes the exposure of sensitive information to an unauthorized actor, and represents a classic example of insecure direct object reference where the service provides access to internal system components through predictable command sequences.
The technical implementation of this vulnerability involves a simple command parsing mechanism within the clarkconnectd service that accepts single-character inputs and responds with corresponding system data. When an attacker sends character A, the service reveals the system date and time information, which can be used for fingerprinting and timing attacks. Character F provides ifconfig output that exposes network configuration details including IP addresses, subnet masks, and network interface information. The M character returns ifconfig data, while P displays running processes which can reveal running services, their configurations, and potentially vulnerable applications. Character Y exposes snort log files that contain network intrusion detection information, and character b provides access to system messages log files that may contain sensitive operational details. These responses collectively provide attackers with comprehensive information about the target system's configuration, running services, network topology, and security monitoring activities.
The operational impact of this vulnerability extends beyond simple information gathering, as it provides attackers with sufficient data to plan more sophisticated attacks against the compromised system. The disclosure of network interface information and process listings enables attackers to identify running services that may have additional vulnerabilities, while access to snort logs can reveal the organization's security monitoring capabilities and potentially expose defensive strategies. The /var/log/messages file access provides insight into system operations, error conditions, and potentially sensitive information about system administration activities. This vulnerability aligns with ATT&CK technique T1082, which describes system information discovery, and T1069, which covers permission groups discovery, as attackers can use this information to map out the target environment and identify potential attack vectors. The lack of authentication for these commands means that any remote attacker with access to the service can exploit this vulnerability without requiring prior access to the system.
Mitigation strategies for this vulnerability should focus on implementing proper authentication mechanisms and access controls for the clarkconnectd service. Organizations should disable the service if it is not required for operations, or configure it to require strong authentication before allowing access to system information. Network segmentation and firewall rules should be implemented to restrict access to the service to only trusted administrative networks. The service should be configured to validate all input commands and implement proper access controls to prevent unauthorized information disclosure. Additionally, regular security audits should be conducted to ensure that no other services within the ClarkConnect environment expose similar information disclosure vulnerabilities. System administrators should also implement log monitoring to detect unauthorized access attempts to these sensitive commands, and consider implementing intrusion detection systems that can identify patterns of information gathering activities. This vulnerability demonstrates the critical importance of implementing proper access controls and authentication for all system services, particularly those that provide administrative functionality or access to sensitive system information.