CVE-2007-3692 in Ezfactory Download Cgi
Summary
by MITRE
Directory traversal vulnerability in download.cgi in EZFactory KDDI Download CGI 1.x allows remote attackers to read and download arbitrary files via a .. (dot dot) in the name parameter.
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Analysis
by VulDB Data Team • 10/25/2017
The vulnerability identified as CVE-2007-3692 represents a critical directory traversal flaw in the EZFactory KDDI Download CGI version 1.x software. This issue specifically affects the download.cgi script which processes file download requests through a name parameter. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly restrict file path access, allowing malicious actors to manipulate the parameter value to access files outside the intended directory structure.
This directory traversal vulnerability operates by exploiting the absence of proper path validation in the CGI script's processing logic. When an attacker supplies a name parameter containing .. (dot dot) sequences, the application fails to sanitize these inputs properly, enabling path traversal attacks that can navigate upward through the directory hierarchy. The vulnerability manifests when the script processes user-supplied file names without adequately validating or filtering the input to prevent unauthorized access to system files. This flaw directly maps to CWE-22, which categorizes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability is severe and multifaceted. Remote attackers can leverage this weakness to access sensitive system files including configuration files, database contents, system logs, and potentially system binaries. The attack surface extends beyond simple file reading to include potential system compromise through exposure of critical system information. This vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachments) as attackers can discover and retrieve sensitive files to aid in further exploitation. The ability to download arbitrary files also enables attackers to potentially retrieve system binaries or configuration files that could be used for privilege escalation or lateral movement within the compromised environment.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening. The most effective immediate solution involves implementing proper input validation and sanitization mechanisms that filter out or reject directory traversal sequences such as .. in file name parameters. Organizations should apply the vendor-provided patch or upgrade to a version that addresses this specific vulnerability. Additionally, implementing proper access controls through web server configuration, restricting file access to specific directories, and employing input validation libraries can prevent similar issues. The principle of least privilege should be enforced by ensuring the CGI script operates with minimal necessary permissions and by implementing proper file access controls. Security monitoring should include detection of unusual file access patterns and parameter values that may indicate attempted directory traversal attacks. This vulnerability demonstrates the critical importance of input validation in web applications and aligns with security best practices outlined in OWASP Top Ten and NIST cybersecurity guidelines for preventing directory traversal attacks.