CVE-2006-4651 in Php Download Script
Summary
by MITRE
Directory traversal vulnerability in download/index.php, and possibly download.php, in threesquared.net (aka Ben Speakman) Php download allows remote attackers to overwrite arbitrary local files via .. (dot dot) sequence in the file parameter.
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Analysis
by VulDB Data Team • 09/23/2017
This vulnerability represents a critical directory traversal flaw in the Php download script developed by threesquared.net, also known as Ben Speakman's implementation. The vulnerability exists within the download/index.php file and potentially extends to download.php, creating a pathway for remote attackers to manipulate file access patterns. The core technical issue stems from inadequate input validation where the file parameter fails to properly sanitize user-supplied data containing .. (dot dot) sequences that are commonly used to navigate up directory levels in file systems.
The flaw allows malicious actors to exploit the lack of proper path validation by injecting directory traversal sequences into the file parameter, enabling them to access and potentially overwrite arbitrary local files on the server. This type of vulnerability falls under the CWE-22 category, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability's impact is particularly severe because it allows attackers to bypass normal file access controls and potentially gain unauthorized access to sensitive system files, configuration data, or even overwrite critical application files.
From an operational perspective, this vulnerability creates significant risk for systems running the affected Php download script, as it can be exploited remotely without authentication requirements. Attackers can leverage this flaw to overwrite files with malicious content, potentially leading to complete system compromise or data destruction. The attack vector is straightforward and can be executed through simple HTTP requests containing the malicious file parameter, making it highly exploitable across various network environments. The vulnerability also aligns with ATT&CK technique T1059, specifically targeting the execution of arbitrary code through manipulation of file access patterns.
The security implications extend beyond simple file access, as successful exploitation can lead to privilege escalation, data exfiltration, or service disruption. Organizations using this vulnerable script face potential exposure to attackers who can manipulate the file system to their advantage, particularly in environments where the web application has write permissions to critical system directories. Mitigation strategies should include immediate input validation and sanitization of all user-supplied file parameters, implementation of strict path validation that prevents directory traversal sequences, and deployment of web application firewalls to filter malicious requests. Additionally, systems should be updated to the latest version of the vulnerable software or patched to prevent exploitation of this directory traversal vulnerability that could lead to complete system compromise.