CVE-2006-2428 in DUbanner
Summary
by MITRE
add.asp in DUware DUbanner 3.1 allows remote attackers to execute arbitrary code by uploading files with arbitrary extensions, such as ASP files, probably due to client-side enforcement that can be bypassed. NOTE: some of these details are obtained from third party information, since the raw source is vague.
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Analysis
by VulDB Data Team • 07/27/2018
The vulnerability identified as CVE-2006-2428 affects DUware DUbanner 3.1, specifically the add.asp component that handles file uploads. This represents a critical server-side vulnerability that allows remote attackers to execute arbitrary code through improper file validation mechanisms. The flaw stems from inadequate server-side input validation where the application relies on client-side restrictions that can be easily circumvented, creating a dangerous path for malicious file uploads. The vulnerability falls under CWE-434 which specifically addresses Unrestricted Upload of File with Dangerous Type, a well-documented weakness in web application security. The issue occurs because the application fails to properly validate file extensions and content types on the server side, relying instead on client-side checks that can be bypassed through manual request manipulation or proxy tooling.
The technical exploitation of this vulnerability involves uploading malicious files with extensions that are typically allowed but contain executable code such as .asp files. When these files are uploaded through the add.asp component, they can be executed on the web server, providing attackers with arbitrary code execution capabilities. The bypass of client-side enforcement occurs because the application does not perform comprehensive server-side validation of uploaded files, allowing attackers to rename or modify file extensions to circumvent the intended restrictions. This type of vulnerability is particularly dangerous because it can be exploited remotely without authentication, allowing attackers to gain full control over the affected web server. The attack vector aligns with ATT&CK technique T1190 which describes Exploit Public-Facing Application, and T1059 which covers Command and Scripting Interpreter, specifically targeting web-based attack surfaces.
The operational impact of this vulnerability is severe and far-reaching for organizations using DUware DUbanner 3.1. Successful exploitation can result in complete system compromise, allowing attackers to execute commands, access sensitive data, modify web content, or establish persistent backdoors. The vulnerability creates a persistent threat vector that can be exploited by automated scanning tools, making it particularly attractive to malicious actors. Organizations may face data breaches, system downtime, and potential regulatory compliance violations depending on the data handled by the compromised system. The vulnerability also demonstrates poor security practices in the application's design, specifically the over-reliance on client-side validation mechanisms that should never be trusted for security purposes. The lack of proper input sanitization and file type validation creates a fundamental security flaw that can be exploited across multiple attack scenarios, including web shell deployment, privilege escalation, and lateral movement within network environments.
Mitigation strategies for this vulnerability must focus on implementing robust server-side file validation and sanitization mechanisms. Organizations should immediately implement proper file extension filtering, content type checking, and file signature validation to prevent the upload of malicious files. The application should enforce strict file type restrictions and reject any uploads that do not meet predetermined security criteria. Additionally, uploaded files should be stored in a separate directory with restricted permissions and should not be executable. The fix should also include implementing proper logging and monitoring of file upload activities to detect suspicious behavior. Organizations should consider implementing web application firewalls and security scanning tools to detect and prevent exploitation attempts. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other applications. The remediation efforts should also include updating to the latest version of DUware DUbanner if available, or implementing compensating controls such as network segmentation and access controls to limit the potential impact of successful exploitation. This vulnerability highlights the critical importance of defense-in-depth security principles and the necessity of server-side validation as the primary security control rather than relying on client-side restrictions.