CVE-2001-0788 in Air Messenger LAN Server
Summary
by MITRE
Internet Software Solutions Air Messenger LAN Server (AMLServer) 3.4.2 allows remote attackers to obtain an absolute path for the server directory by viewing the Location header.
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Analysis
by VulDB Data Team • 10/04/2025
The vulnerability identified as CVE-2001-0788 affects the Internet Software Solutions Air Messenger LAN Server version 3.4.2, representing a classic information disclosure flaw that exposes sensitive system details to remote attackers. This issue resides within the server's response handling mechanism where it inadvertently reveals the absolute file path of the server directory through the HTTP Location header. The vulnerability demonstrates a fundamental lack of proper input validation and output sanitization in the server's response generation process, creating an information leak that can be exploited by malicious actors to gain insights into the underlying system structure.
The technical flaw manifests when the AMLServer processes certain requests and includes the absolute path in the Location header of HTTP responses. This occurs because the server fails to properly sanitize or obfuscate directory paths that are included in redirect responses, allowing attackers to directly observe the physical directory structure of the server installation. The vulnerability is classified as an information disclosure issue that aligns with CWE-200, which specifically addresses the exposure of sensitive information through improper error handling or response construction. This type of vulnerability enables attackers to gather intelligence about the server environment, potentially facilitating more sophisticated attacks by providing knowledge of file system layout and directory structures.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with critical system information that can be leveraged in subsequent exploitation phases. An attacker who successfully exploits this vulnerability can use the disclosed absolute paths to understand the server's file structure, potentially identifying sensitive files, configuration data, or other system components that may be vulnerable to further exploitation. This information disclosure creates a foundation for privilege escalation attacks or other advanced exploitation techniques that rely on understanding the target system's architecture. The vulnerability also aligns with ATT&CK technique T1083, which focuses on discovering system information through directory and file listing capabilities, making it a valuable reconnaissance tool for threat actors.
Mitigation strategies for CVE-2001-0788 should focus on implementing proper output sanitization and response handling within the AMLServer application. System administrators should ensure that all HTTP responses, particularly those containing redirect information, do not include absolute file paths or system-specific information that could aid attackers. The recommended approach involves modifying the server's response generation logic to either remove or obfuscate directory paths from Location headers, implementing proper input validation, and conducting regular security reviews of response handling code. Additionally, organizations should consider implementing network segmentation and access controls to limit exposure of the affected server to untrusted networks, while also ensuring that all system components are updated to versions that address this specific vulnerability through proper code fixes and security patches.