CVE-2006-2318 in Ideal BB
Summary
by MITRE
Incomplete blacklist vulnerability in Ideal Science Ideal BB 1.5.4a and earlier allows remote attackers to upload and execute an ASP script via a ".asa" file, which bypasses the check for the ".asp" extension but is executable on the server.
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Analysis
by VulDB Data Team • 06/18/2019
The vulnerability described in CVE-2006-2318 represents a critical security flaw in the Ideal Science Ideal BB 1.5.4a and earlier versions of the bulletin board software. This issue stems from an incomplete blacklist implementation that fails to properly validate file extensions during the upload process. The vulnerability specifically targets the server-side execution capabilities of the application by allowing malicious actors to bypass standard security checks designed to prevent the upload of executable scripts.
The technical flaw manifests through the improper handling of file extensions within the upload validation mechanism. While the system correctly identifies and blocks uploads with the ".asp" extension, it fails to account for the ".asa" extension which serves the same purpose in internet information services. The ".asa" extension is recognized by IIS as a server-side include file that executes on the server, making it functionally equivalent to ".asp" files from an execution standpoint. This oversight in the validation logic creates a path for remote code execution through the upload of malicious files that appear to be legitimate but are actually executable scripts.
The operational impact of this vulnerability is severe and multifaceted. Remote attackers can leverage this flaw to upload malicious ASP scripts that will execute with the privileges of the web server process. This capability enables attackers to perform a wide range of malicious activities including data exfiltration, system compromise, privilege escalation, and persistent backdoor establishment. The vulnerability essentially grants attackers a foothold within the target environment that can be used to pivot to other systems or escalate privileges within the network. The persistence of such attacks is particularly concerning as the uploaded scripts can remain undetected for extended periods, allowing for prolonged unauthorized access.
This vulnerability aligns with CWE-434, which addresses the insecure upload of files that execute code, and represents a classic example of inadequate input validation and sanitization. From an ATT&CK framework perspective, this issue maps to T1190 - Exploit Public-Facing Application and T1059 - Command and Scripting Interpreter, as it enables both application exploitation and remote code execution through script-based attacks. The incomplete blacklist approach violates fundamental security principles of defense in depth, where multiple layers of protection should be implemented to prevent such bypasses. Organizations should implement comprehensive file validation mechanisms that either use allowlists of approved extensions or properly validate file content rather than relying on incomplete blacklists that can be easily circumvented through knowledge of alternative extensions with similar server-side execution capabilities.
The remediation strategy involves immediate patching of the affected software to the latest available version that addresses this validation flaw. Additionally, organizations should implement robust file type validation that checks not only the extension but also the MIME type and actual file content to ensure that uploaded files conform to expected formats and do not contain executable content. Network segmentation and proper access controls should be implemented to limit the potential impact of successful exploitation attempts, while monitoring systems should be configured to detect suspicious file upload activities and unusual execution patterns that might indicate compromise.