CVE-2002-2095 in Hellbent
Summary
by MITRE
Joe Testa hellbent 01 webserver allows attackers to read files that are specified in the hellbent.prefs file by creating a file with a similar name in the web root, as demonstrated using (1) index.webroot and (2) index.ipallow.
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Analysis
by VulDB Data Team • 08/30/2025
The vulnerability identified as CVE-2002-2095 affects the hellbent 01 webserver implementation and represents a critical directory traversal flaw that allows unauthorized file access through improper input validation. This weakness stems from the webserver's failure to properly sanitize user-supplied paths when processing requests, enabling attackers to bypass normal access controls and retrieve sensitive files that are configured in the hellbent.prefs configuration file. The vulnerability specifically manifests when attackers create files with names that mirror those referenced in the configuration file within the web root directory, thereby exploiting a path traversal mechanism that was not properly secured against malicious input manipulation.
The technical implementation of this vulnerability demonstrates a classic case of insufficient input sanitization and improper access control enforcement. When the webserver processes requests for files specified in the hellbent.prefs configuration, it fails to validate or sanitize the requested file paths against the actual filesystem structure. This allows attackers to craft requests that reference files in the web root directory with names similar to those configured in the preferences file, effectively bypassing the intended security boundaries. The demonstration cases using index.webroot and index.ipallow files illustrate how attackers can exploit this flaw by creating appropriately named files in the web root that correspond to the sensitive configuration references, thereby gaining access to information that should remain restricted.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the ability to access potentially sensitive configuration data, system files, and other resources that should be protected from unauthorized access. This flaw can be leveraged to extract server configuration details, access user data, and potentially gain further insights into the system architecture that could facilitate additional attacks. The vulnerability operates at the application layer and can be exploited through standard web requests without requiring special privileges or tools, making it particularly dangerous as it can be easily automated and scaled across multiple targets. Security practitioners should note that this vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, and represents a form of path traversal attack that has been consistently observed in web applications over many years.
Mitigation strategies for CVE-2002-2095 should focus on implementing proper input validation, sanitization, and access control mechanisms within the webserver implementation. Organizations should ensure that all user-supplied input is properly validated against a whitelist of allowed paths and that the webserver enforces strict directory boundaries to prevent traversal attacks. The implementation of proper access control lists and file permission settings can help prevent unauthorized access to sensitive configuration files and system resources. Additionally, security measures should include regular auditing of webserver configurations, implementation of web application firewalls, and the deployment of intrusion detection systems to monitor for suspicious file access patterns. This vulnerability also highlights the importance of following secure coding practices and conducting regular security assessments to identify and remediate similar path traversal flaws in web applications. The ATT&CK framework categorizes this vulnerability under privilege escalation and defense evasion techniques, as attackers can use such flaws to gain unauthorized access to system resources and potentially establish persistent access to compromised systems.