CVE-2002-0233 in Expressions
Summary
by MITRE
Directory traversal vulnerability in eshare Expressions 4 Web server allows remote attackers to read arbitrary files via a .. (dot dot) in an HTTP request.
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Analysis
by VulDB Data Team • 10/22/2024
The vulnerability identified as CVE-2002-0233 represents a critical directory traversal flaw within the eshare Expressions 4 Web server implementation. This security weakness stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied HTTP request parameters containing directory traversal sequences. The flaw specifically manifests when the web server processes requests containing .. (dot dot) sequences that are intended to navigate up directory levels in the file system hierarchy. Such sequences are commonly used in directory traversal attacks to access files outside the intended web root directory, potentially exposing sensitive system resources to unauthorized access.
The technical nature of this vulnerability aligns with CWE-22, which categorizes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. This weakness occurs when applications fail to properly validate or sanitize user input that is used to construct file paths, allowing attackers to manipulate the intended file access behavior. The eshare Expressions 4 Web server's failure to implement proper input sanitization creates an environment where attackers can exploit this vulnerability by crafting HTTP requests that include .. sequences in their path parameters. These sequences, when processed without proper validation, enable the web server to traverse directories beyond its intended scope and access arbitrary files on the underlying file system.
The operational impact of this vulnerability extends beyond simple unauthorized file access, potentially enabling attackers to extract sensitive information such as configuration files, database credentials, system logs, and other confidential data. Attackers can leverage this vulnerability to gain insights into the system architecture, potentially identifying other security weaknesses or exploiting additional vulnerabilities within the same system. The remote nature of this attack vector means that adversaries do not require local system access or authentication credentials to exploit the vulnerability, making it particularly dangerous for web-facing applications. This vulnerability can lead to complete system compromise if attackers can access critical system files or configuration data that contains sensitive information.
Mitigation strategies for CVE-2002-0233 should focus on implementing robust input validation and sanitization mechanisms within the web server's request processing pipeline. Organizations should ensure that all user-supplied input is properly validated before being used in file path construction operations, with particular attention to filtering or rejecting any sequences that could enable directory traversal. The implementation of a whitelist approach for acceptable file paths, combined with proper directory path normalization and absolute path resolution, can effectively prevent attackers from manipulating file access behavior. Additionally, system administrators should consider implementing proper access controls and privilege separation to limit the damage that could result from successful exploitation of this vulnerability. The remediation process should also include regular security assessments and penetration testing to identify similar weaknesses in other applications and systems that may be vulnerable to the same class of attack. Security frameworks such as the ATT&CK matrix classify this vulnerability under the technique of "Path Traversal" with specific implications for information disclosure and privilege escalation, emphasizing the need for comprehensive defensive measures across multiple security domains.