CVE-2007-4314 in pixlie
Summary
by MITRE
pixlie.php in Pixlie 1.7 allows remote attackers to trigger the reading and JPEG image processing of files in a remote directory tree via a URL in the root parameter. NOTE: this can be leveraged for traffic amplification or other denial of service.
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Analysis
by VulDB Data Team • 09/30/2024
The vulnerability identified as CVE-2007-4314 affects Pixlie 1.7, a web-based image processing application that enables users to manipulate jpeg images through a php interface. This flaw resides in the pixlie.php script which processes user-supplied input through the root parameter. The vulnerability represents a classic path traversal or directory traversal issue that allows remote attackers to manipulate the application's file processing behavior by supplying malicious URLs in the root parameter. The vulnerability is particularly concerning because it enables attackers to access arbitrary files on the server's file system, potentially exposing sensitive data or system information that should remain protected.
The technical exploitation of this vulnerability occurs when the application fails to properly validate or sanitize the root parameter input before using it in file processing operations. When an attacker provides a crafted URL in the root parameter, the pixlie.php script processes this input as if it were a legitimate directory path, allowing it to read and attempt to process JPEG image files from any location within the server's directory structure. This lack of input validation creates a direct pathway for attackers to bypass normal access controls and potentially access files that should be restricted or protected. The vulnerability can be categorized under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. From an operational perspective, this vulnerability enables attackers to leverage the application's legitimate image processing capabilities for malicious purposes, creating a dangerous attack vector that can be used for data exfiltration, reconnaissance, or system compromise.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it can be weaponized for denial of service attacks through traffic amplification techniques. Attackers can craft malicious requests that cause the vulnerable application to process large amounts of data or perform resource-intensive operations, leading to excessive bandwidth consumption or system resource exhaustion. This amplification effect occurs because the application's legitimate image processing functions can be triggered with minimal input to generate substantial output or processing overhead. The vulnerability aligns with ATT&CK technique T1005, which covers data from local system, and T1499, which covers network denial of service, making it a multi-faceted threat that can be used for both information gathering and service disruption. The potential for traffic amplification means that even a small number of requests can generate significant network traffic, making this vulnerability particularly dangerous in environments where bandwidth is limited or where attackers seek to overwhelm network resources.
Mitigation strategies for this vulnerability must address both the immediate input validation issue and the broader security posture of the application. The most effective immediate solution involves implementing strict input validation and sanitization for all user-supplied parameters, particularly those used in file system operations. The application should validate that the root parameter contains only acceptable directory paths and reject any input that attempts to traverse directories or access restricted areas. Additionally, implementing proper access controls and ensuring that the application runs with minimal required privileges can limit the damage that can be caused by exploitation. Security measures should include restricting the application's ability to access system directories, implementing proper file access controls, and ensuring that the application's file processing functions are isolated from sensitive system resources. Organizations should also consider implementing network-level protections such as rate limiting and intrusion detection systems to monitor for suspicious traffic patterns that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of input validation in web applications and highlights how seemingly benign functionality can be exploited for significant security impacts when proper safeguards are not implemented.