CVE-2006-2419 in Directory Listing Script
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.php in Directory Listing Script allows remote attackers to inject arbitrary web script or HTML via the dir parameter.
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Analysis
by VulDB Data Team • 06/18/2017
The vulnerability described in CVE-2006-2419 represents a classic cross-site scripting flaw within a directory listing script's index.php component. This type of vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and well-documented web application security weaknesses. The directory listing script, designed to display file structures on web servers, becomes a vector for malicious code injection when it fails to properly sanitize user input parameters. The specific flaw occurs in how the script processes the dir parameter, which is typically used to specify the directory path to be displayed in the listing.
The technical implementation of this vulnerability allows remote attackers to execute arbitrary web scripts or HTML code within the context of other users' browsers. When a user navigates to a page that includes the vulnerable directory listing script with a maliciously crafted dir parameter, the injected code executes in the victim's browser session. This creates a persistent threat where attackers can manipulate the directory listing interface to serve malicious content, potentially including phishing scripts, malware download links, or code that steals session cookies and other sensitive information. The vulnerability is particularly concerning because it operates at the application layer without requiring any special privileges or authentication.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable more sophisticated attack vectors such as session hijacking, credential theft, and data exfiltration. Attackers can craft payloads that redirect users to malicious sites, inject tracking scripts to monitor user behavior, or even deploy browser-based exploits that leverage other vulnerabilities present in the victim's browsing environment. The attack surface is broad since directory listing scripts are commonly deployed across various web servers and applications, making this vulnerability particularly dangerous in environments where such scripts are exposed to untrusted users. This vulnerability directly aligns with ATT&CK technique T1566.001 for credential access through phishing and T1059.001 for command and scripting interpreter execution.
Mitigation strategies for this vulnerability must focus on input validation and output encoding to prevent malicious code from being executed within the directory listing context. The primary defense involves implementing proper sanitization of the dir parameter before it is processed or displayed in the web interface, ensuring that any potentially dangerous characters or script tags are removed or encoded. Additionally, developers should employ Content Security Policy headers to restrict script execution within the directory listing context, and implement proper access controls to limit which users can access the directory listing functionality. The solution should also include regular security audits of web applications to identify similar input handling vulnerabilities, particularly in legacy systems that may contain other instances of the same class of weakness. Organizations should consider implementing web application firewalls to detect and block suspicious parameter values, and establish secure coding practices that emphasize the principle of least privilege in directory access controls.