CVE-2000-1159 in Sniffer Agent
Summary
by MITRE
NAI Sniffer Agent allows remote attackers to gain privileges on the agent by sniffing the initial UDP authentication packets and spoofing commands.
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Analysis
by VulDB Data Team • 04/07/2019
The vulnerability described in CVE-2000-1159 represents a critical security flaw in the NAI Sniffer Agent software that enables remote attackers to escalate privileges through a sophisticated man-in-the-middle attack vector. This vulnerability specifically targets the authentication mechanism of the Sniffer Agent, which is designed to monitor network traffic and provide security analytics for network administrators. The flaw occurs during the initial UDP authentication process where the agent communicates with network monitoring systems, creating an exploitable window where malicious actors can intercept and manipulate authentication packets.
The technical implementation of this vulnerability stems from insufficient authentication security measures within the Sniffer Agent's communication protocol. When the agent initializes its connection to network monitoring services, it relies on UDP packets for initial authentication without adequate cryptographic protection or session validation. Attackers can exploit this weakness by positioning themselves on the network to capture the initial UDP authentication packets that are transmitted in plaintext. Once captured, these packets contain authentication information that allows the attacker to spoof legitimate commands and establish unauthorized privileged access to the Sniffer Agent's operational functions. This represents a classic example of weak authentication and session management that violates fundamental security principles outlined in the OWASP Top Ten and NIST cybersecurity frameworks.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows attackers to gain full administrative control over the Sniffer Agent and potentially the underlying network monitoring infrastructure. This access could enable attackers to modify network monitoring rules, disable security alerts, or even redirect traffic to malicious endpoints without detection. The vulnerability is particularly concerning because it operates at a foundational level of network security monitoring, meaning that successful exploitation could compromise the integrity of the entire network security posture. The attack requires minimal sophistication to execute, as it relies on standard network sniffing tools and packet manipulation techniques that are readily available to malicious actors. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under credential access and privilege escalation categories, specifically targeting the use of legitimate credentials to gain unauthorized access to systems.
Mitigation strategies for CVE-2000-1159 require immediate implementation of network-level security controls and protocol enhancements to prevent unauthorized packet interception and manipulation. Organizations should implement network segmentation and access control lists to limit the exposure of UDP authentication ports to trusted network segments only. The most effective solution involves upgrading to newer versions of the Sniffer Agent software that incorporate proper cryptographic authentication mechanisms and session management protocols. Network administrators should also deploy intrusion detection systems that can monitor for anomalous UDP packet patterns and authentication attempts that deviate from normal operational behavior. Additionally, implementing encrypted communication channels for all authentication processes and establishing robust network monitoring procedures can significantly reduce the attack surface. The vulnerability serves as a prime example of why security-by-design principles are essential, as the lack of proper authentication security in the initial protocol design created an exploitable condition that allowed remote privilege escalation without requiring specialized attack tools or extensive network knowledge. Organizations should also consider implementing certificate-based authentication and mutual authentication protocols to prevent similar vulnerabilities in other network monitoring and security infrastructure components.