CVE-2008-1642 in Savas Guestbook
Summary
by MITRE
Directory traversal vulnerability in index.php in Sava s GuestBook 2.0 allows remote attackers to include and execute arbitrary local files via directory traversal sequences in the action parameter. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 11/16/2017
This vulnerability represents a classic directory traversal flaw that affects the Sava s GuestBook 2.0 web application. The issue resides in the index.php file where the action parameter is processed without proper input validation or sanitization. Attackers can exploit this weakness by crafting malicious directory traversal sequences such as ../ or ..\ to navigate outside the intended directory structure and access arbitrary local files on the server. The vulnerability stems from insufficient validation of user-supplied input, allowing unauthorized file inclusion and execution capabilities that can lead to complete system compromise.
The technical implementation 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 flaw operates at the application layer and can be classified under ATT&CK technique T1505.003 for server-side include attacks. The vulnerability is particularly dangerous because it enables remote code execution through file inclusion mechanisms, allowing attackers to execute arbitrary code on the target system with the privileges of the web server process. The attack vector is straightforward - an attacker simply needs to manipulate the action parameter in the URL to include malicious file paths.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass full system compromise. Successful exploitation can result in unauthorized access to sensitive data, system file enumeration, privilege escalation, and potential backdoor installation. Attackers can leverage this vulnerability to gain access to database files, configuration files, and other sensitive system resources that should remain protected. The remote nature of the attack means that exploitation can occur from anywhere on the internet without requiring physical access to the target system, making it particularly attractive to automated attack tools and threat actors.
Mitigation strategies should focus on implementing proper input validation and sanitization mechanisms. The application should validate all user-supplied input through whitelisting approaches, ensuring that only predefined safe values are accepted for the action parameter. Additionally, the web application should employ secure coding practices such as using absolute paths for file operations and implementing proper access controls to restrict file system access. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious directory traversal attempts. Regular security assessments and code reviews are essential to identify similar vulnerabilities in other applications and ensure that proper security controls are in place to prevent unauthorized file access and execution.