CVE-2007-1726 in IceBB
Summary
by MITRE
Unrestricted file upload vulnerability in index.php in IceBB 1.0-rc5 allows remote authenticated users to upload arbitrary files via the avatar function, which can later be accessed in uploads/.
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Analysis
by VulDB Data Team • 08/31/2024
The vulnerability identified as CVE-2007-1726 represents a critical security flaw in IceBB version 1.0-rc5 that enables authenticated attackers to bypass file upload restrictions through the avatar functionality. This issue stems from inadequate input validation and sanitization within the index.php script, specifically in how the system handles user avatar uploads. The vulnerability is classified under CWE-434 which encompasses insecure file upload scenarios where applications fail to properly validate file types and contents, allowing malicious files to be uploaded and subsequently executed or accessed by unauthorized parties.
The technical implementation of this flaw occurs when authenticated users leverage the avatar upload feature to submit files without proper type checking or content validation. The system accepts uploads to the uploads/ directory without verifying file extensions, MIME types, or content signatures, creating a pathway for attackers to upload malicious files such as php shells, javascript payloads, or other executable content. This unrestricted approach to file handling directly violates secure coding practices and security best practices outlined in the OWASP Top Ten, specifically addressing the risk of file upload vulnerabilities that can lead to remote code execution or privilege escalation.
Operationally, this vulnerability has severe implications for systems running affected IceBB versions, as it provides attackers with a persistent method to establish a foothold within the application environment. Once an attacker successfully uploads a malicious file, they can access it through the uploads/ directory, potentially enabling them to execute arbitrary code on the server, escalate privileges, or establish backdoors. The authenticated nature of the vulnerability means that attackers must first compromise legitimate user credentials, but the impact remains significant as it allows for lateral movement and persistence within the system. This vulnerability aligns with ATT&CK technique T1078 which covers legitimate credentials and T1505 which covers server-side injection.
The mitigation strategies for CVE-2007-1726 require immediate implementation of proper file validation mechanisms, including strict file type checking, content verification, and secure upload storage practices. Organizations should enforce whitelisting of allowed file extensions, implement MIME type validation, and ensure uploaded files are stored outside the web root or with appropriate access controls. Additionally, proper input sanitization and output encoding should be implemented throughout the application to prevent similar vulnerabilities from emerging in other components. Regular security audits and code reviews should be conducted to identify and remediate similar insecure file handling patterns that could exist in other parts of the application infrastructure.