CVE-2002-1080 in Abyss Web Server
Summary
by MITRE
The Administration console for Abyss Web Server 1.0.3 before Patch 2 allows remote attackers to gain privileges and modify server configuration via direct requests to CHL files such as (1) srvstatus.chl, (2) consport.chl, (3) general.chl, (4) srvparam.chl, and (5) advanced.chl.
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Analysis
by VulDB Data Team • 09/08/2025
The vulnerability identified as CVE-2002-1080 represents a critical privilege escalation flaw in the Abyss Web Server administration console version 1.0.3 prior to Patch 2. This issue stems from inadequate access controls within the web server's administrative interface, specifically affecting the handling of configuration files with the .chl extension. The affected files include srvstatus.chl, consport.chl, general.chl, srvparam.chl, and advanced.chl, which are integral components of the server's configuration management system. These files are designed to store sensitive administrative settings and parameters that control various aspects of the web server's operation and security posture.
The technical flaw manifests through the absence of proper authentication and authorization checks when processing direct requests to these configuration files. Attackers can exploit this vulnerability by crafting malicious HTTP requests that target the specific .chl files without proper session validation or administrative privileges. This allows unauthorized individuals to bypass the normal authentication mechanisms typically required to access the administration console. The vulnerability operates at the application layer and demonstrates a classic lack of input validation and access control implementation, which aligns with CWE-285 - Improper Authorization and CWE-352 - Cross-Site Request Forgery. The flaw essentially provides attackers with direct access to administrative functions that should only be available to authenticated administrators.
The operational impact of this vulnerability is severe and multifaceted, as it enables remote attackers to completely compromise the web server's administrative functions. Once exploited, attackers can modify critical server parameters including port configurations, general settings, server parameters, and advanced configuration options. This level of access allows for complete server compromise, including the potential to redirect traffic, modify security settings, install malicious software, or disable security features. The vulnerability essentially transforms a legitimate administrative interface into a backdoor that can be exploited from anywhere on the internet, making it particularly dangerous for servers exposed to public networks. The impact extends beyond simple configuration changes as it provides attackers with the ability to fundamentally alter the server's behavior and security posture, potentially leading to full system compromise or data exfiltration.
Mitigation strategies for this vulnerability should prioritize immediate patching of the Abyss Web Server to version 1.0.3 Patch 2 or later, which addresses the authentication bypass issue. Organizations should implement network segmentation to limit access to administrative interfaces, ensuring that only trusted networks can reach the server's administrative ports. Additional protective measures include implementing strong authentication mechanisms, such as multi-factor authentication for administrative access, and configuring firewalls to restrict access to administrative interfaces to specific IP addresses or ranges. The vulnerability also highlights the importance of principle of least privilege in web server configurations, where administrative interfaces should never be exposed to untrusted networks without proper security controls. Security monitoring should include detection of unusual administrative requests and access patterns to these configuration files, as outlined in the attack techniques described in the MITRE ATT&CK framework under T1078 - Valid Accounts and T1566 - Phishing. Regular security audits and penetration testing should be conducted to identify similar access control vulnerabilities in other web applications and services.