CVE-2006-2899 in InternetDISK
Summary
by MITRE
Unspecified vulnerability in ESTsoft InternetDISK versions before 2006/04/20 allows remote authenticated users to execute arbitrary code, possibly by uploading a file with multiple extensions into the WebLink directory.
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Analysis
by VulDB Data Team • 10/17/2025
The vulnerability identified as CVE-2006-2899 represents a critical security flaw in ESTsoft InternetDISK software versions prior to the 2006/04/20 release. This unspecified vulnerability creates a pathway for remote authenticated attackers to execute arbitrary code on affected systems, fundamentally compromising the security posture of deployed instances. The flaw specifically manifests within the file handling mechanisms of the WebLink directory functionality, where improper validation of file extensions allows malicious actors to bypass security controls through crafted file uploads.
The technical exploitation of this vulnerability stems from inadequate input validation and file extension handling within the InternetDISK application. When authenticated users upload files to the WebLink directory, the system fails to properly sanitize or restrict file extensions, enabling attackers to craft filenames with multiple extensions that can evade detection mechanisms. This type of vulnerability aligns with CWE-434, which describes insecure file upload vulnerabilities where applications accept files without proper validation of their content or extension. The vulnerability essentially allows attackers to upload malicious files that can be executed as web content, creating a persistent backdoor or execution environment within the target system.
From an operational perspective, this vulnerability presents a severe risk to organizations relying on ESTsoft InternetDISK for web hosting and file management services. Remote authenticated users who can access the WebLink directory can leverage this flaw to execute arbitrary commands on the underlying server, potentially leading to complete system compromise. The attack vector requires only authentication credentials, making it particularly dangerous as it can be exploited by insiders or compromised legitimate users. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1190 for Exploit Public-Facing Application and T1059 for Command and Scripting Interpreter, demonstrating how the flaw enables lateral movement and privilege escalation within compromised environments.
The impact of this vulnerability extends beyond immediate code execution capabilities to encompass broader security implications including data exfiltration, system persistence, and potential privilege escalation. Organizations utilizing affected versions of InternetDISK face significant exposure to unauthorized access and system compromise, particularly in environments where the software serves as a web hosting platform or file sharing service. The vulnerability's exploitation requires minimal technical expertise, making it attractive to threat actors seeking to establish persistent access to target networks. Security professionals should prioritize immediate remediation through patching or version updates, as well as implement network monitoring to detect potential exploitation attempts. Additionally, implementing proper file extension validation, restricting upload permissions, and conducting regular security assessments of web applications can significantly reduce the risk associated with similar vulnerabilities in other software systems.