CVE-2001-0561 in A1Stats
Summary
by MITRE
Directory traversal vulnerability in Drummond Miles A1Stats prior to 1.6 allows a remote attacker to read arbitrary files via a .. (dot dot) attack in (1) a1disp2.cgi, (2) a1disp3.cgi, or (3) a1disp4.cgi.
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Analysis
by VulDB Data Team • 12/22/2024
The vulnerability identified as CVE-2001-0561 represents a classic directory traversal flaw in the A1Stats web application developed by Drummond Miles. This security weakness affects versions prior to 1.6 and allows remote attackers to access arbitrary files on the server by exploiting improper input validation in three specific CGI scripts. The vulnerability stems from the application's failure to properly sanitize user-supplied input that is used to construct file paths, creating an opportunity for attackers to manipulate the application's behavior through carefully crafted requests containing directory traversal sequences.
The technical implementation of this vulnerability occurs within the a1disp2.cgi, a1disp3.cgi, and a1disp4.cgi scripts which are part of the A1Stats web statistics application. These scripts likely accept user input through URL parameters or form fields that are directly incorporated into file system operations without adequate validation or sanitization. When a malicious user submits a request containing sequences such as "../" or similar directory traversal patterns, the application processes these inputs without proper boundary checking, allowing the attacker to navigate outside the intended directory structure and access files that should remain restricted. This flaw aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal vulnerabilities.
The operational impact of this vulnerability is significant as it provides attackers with the ability to read arbitrary files from the web server's file system, potentially exposing sensitive information such as configuration files, database credentials, application source code, or other confidential data. An attacker could leverage this vulnerability to gain unauthorized access to system files, user data, or application internals that should remain protected. The remote nature of this attack means that an attacker does not need physical access to the system or local network privileges to exploit the vulnerability, making it particularly dangerous in publicly accessible web environments. This type of vulnerability can be exploited to perform reconnaissance activities, escalate privileges, or facilitate further attacks within the compromised network infrastructure.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms within the affected CGI scripts. The most effective approach involves ensuring that all user-supplied input is properly validated before being used in file system operations, with strict checks to prevent directory traversal sequences from being processed. Implementing a whitelist approach for acceptable file paths or using secure file access libraries that automatically handle path validation can significantly reduce the risk. Additionally, restricting file access permissions and implementing proper access controls can limit the damage that can be caused even if the vulnerability is exploited. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious patterns of directory traversal attempts. The remediation process requires updating to version 1.6 or later of the A1Stats application where the vulnerability has been addressed through proper input validation and sanitization measures. This vulnerability exemplifies the importance of secure coding practices and proper input validation as outlined in various cybersecurity frameworks including the OWASP Top Ten and NIST cybersecurity guidelines, which emphasize the critical need for proper data sanitization and access control mechanisms in web applications.