CVE-2006-2153 in DirectAdmin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in HTM_PASSWD in DirectAdmin Hosting Management allows remote attackers to inject arbitrary web script or HTML via the domain parameter.
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Analysis
by VulDB Data Team • 06/18/2019
The vulnerability identified as CVE-2006-2153 represents a critical cross-site scripting flaw within the HTM_PASSWD component of DirectAdmin hosting management software. This security weakness resides in the web-based administrative interface that manages hosting accounts and domain configurations. The vulnerability specifically affects the domain parameter handling within the HTM_PASSWD functionality, which is designed to manage password protection for web directories. Attackers can exploit this weakness by crafting malicious input that gets reflected back to users without proper sanitization or encoding, creating a persistent XSS vector that can compromise user sessions and execute unauthorized code within the victim's browser context. The vulnerability demonstrates a fundamental failure in input validation and output encoding practices that are essential for preventing malicious script injection attacks.
This XSS vulnerability operates through a classic reflected attack pattern where malicious input is accepted through the domain parameter and then directly embedded into the web response without adequate sanitization. The flaw falls under CWE-79 which specifically addresses Cross-Site Scripting vulnerabilities in software applications. The attack surface is particularly dangerous because DirectAdmin serves as a hosting control panel that administrators and users interact with regularly, making the exploitation potential widespread and impactful. The vulnerability allows attackers to execute arbitrary JavaScript code within the context of a victim's browser session, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The attack can be delivered through various vectors including email links, compromised websites, or social engineering techniques that trick users into clicking malicious URLs containing the crafted XSS payload.
The operational impact of this vulnerability extends beyond simple script execution to encompass significant security implications for hosting environments and their users. When exploited, the vulnerability can enable attackers to steal session cookies, manipulate user interface elements, redirect users to phishing sites, or even escalate privileges within the hosting environment. The attack can be particularly devastating in shared hosting environments where multiple customers' accounts are managed through the same control panel interface. The vulnerability's exploitation can lead to unauthorized access to customer data, account takeovers, and potential compromise of the entire hosting infrastructure. Given that DirectAdmin is commonly used by web hosting providers, the impact of this vulnerability can cascade across numerous websites and users, creating a substantial risk to web infrastructure security. The vulnerability also demonstrates weaknesses in the application's security architecture and input validation mechanisms that should have been implemented to prevent such reflective XSS conditions.
Mitigation strategies for CVE-2006-2153 should focus on implementing comprehensive input validation and output encoding mechanisms within the DirectAdmin application. The primary defense involves ensuring that all user-supplied input, particularly the domain parameter in this case, undergoes strict sanitization before being processed or returned in web responses. This approach aligns with ATT&CK technique T1203 which involves the use of web shells and malicious scripts in web applications. Organizations should implement Content Security Policy headers to limit script execution, employ proper HTML encoding for all dynamic content, and ensure that the application follows secure coding practices that prevent XSS vulnerabilities. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in web applications, and the DirectAdmin software should be updated to versions that contain patches addressing this specific XSS weakness. The vulnerability also underscores the importance of implementing proper access controls and authentication mechanisms within hosting management interfaces to limit potential exploitation vectors.