CVE-2000-0598 in Proxy+
Summary
by MITRE
Fortech Proxy+ allows remote attackers to bypass access restrictions for to the administration service by redirecting their connections through the telnet proxy.
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Analysis
by VulDB Data Team • 05/18/2019
The vulnerability described in CVE-2000-0598 represents a critical access control flaw within the Fortech Proxy+ software that enables remote attackers to circumvent administrative security measures through a sophisticated proxy redirection technique. This vulnerability specifically targets the authentication and authorization mechanisms of the administration service, creating a pathway for unauthorized entities to gain elevated privileges without proper credentials. The flaw exists in the proxy server implementation where the system fails to properly validate connection origins and routing paths, allowing malicious actors to exploit the telnet proxy functionality as an intermediary to access restricted administrative interfaces.
The technical exploitation of this vulnerability relies on the proxy server's insufficient validation of incoming connection requests and their subsequent redirection through the telnet proxy component. When legitimate administrative connections are routed through the proxy, the system does not adequately verify that the connection originates from authorized sources or that the intended destination remains within the protected administrative boundaries. This weakness creates a tunneling opportunity where attackers can manipulate connection paths to bypass the normal access control checks that would typically prevent unauthorized access to administrative functions. The vulnerability essentially allows for a man-in-the-middle attack vector where the proxy server becomes an unwitting facilitator of privilege escalation rather than a security enforcer.
From an operational impact perspective, this vulnerability poses severe risks to organizations relying on Fortech Proxy+ for network security management. The ability to bypass administrative access controls means that attackers can potentially gain full control over the proxy server configuration, modify security policies, access sensitive network data, and establish persistent backdoors within the network infrastructure. The implications extend beyond immediate unauthorized access to include potential data exfiltration, network disruption, and the compromise of downstream systems that depend on the proxy server for secure communications. Organizations may experience significant operational disruption as attackers exploit this vulnerability to conduct reconnaissance, establish covert communication channels, and systematically compromise network assets over time.
The vulnerability aligns with CWE-284, which addresses improper access control issues in software systems, and demonstrates how proxy server implementations can create security gaps when connection validation is insufficient. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and lateral movement through proxy servers, specifically targeting the T1021.004 technique for remote services and T1566 for credential harvesting through network proxies. Effective mitigation strategies include implementing strict connection validation protocols that verify the authenticity of all routing requests, configuring access control lists that prevent unauthorized redirection through proxy components, and deploying network segmentation measures to isolate administrative functions from general network traffic. Organizations should also consider implementing additional authentication layers and monitoring systems to detect anomalous proxy usage patterns that might indicate exploitation attempts. Regular security assessments and patch management procedures are essential to address such vulnerabilities in legacy systems where direct vendor support may no longer be available.