CVE-2008-6568 in Yehe
Summary
by MITRE
Unrestricted file upload vulnerability in Yehe 2.0 allows remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in the envoyer feature. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 11/03/2018
The CVE-2008-6568 vulnerability represents a critical unrestricted file upload flaw in Yehe 2.0 content management system that exposes organizations to remote code execution risks. This vulnerability stems from inadequate input validation and sanitization within the application's file upload functionality, specifically affecting the envoyer feature. The flaw allows malicious actors to bypass security controls by uploading executable files with extensions such as .php, .asp, .jsp, or other server-side script extensions that the application permits. The vulnerability's severity is compounded by the fact that the uploaded files can be directly accessed through HTTP requests, eliminating the need for additional exploitation steps to achieve code execution on the target server.
From a technical perspective, this vulnerability maps to CWE-434 Unrestricted Upload of File with Dangerous Type, which is classified under the CWE top 25 most dangerous software weaknesses. The flaw occurs when the application fails to properly validate file extensions, content types, or file signatures during the upload process, allowing attackers to bypass security mechanisms that should prevent execution of potentially harmful files. The envoyer feature in Yehe 2.0 appears to lack proper file type filtering, directory restrictions, or execution permission controls, creating an attack surface where uploaded files can be immediately executed by the web server. This represents a fundamental failure in the principle of least privilege and input validation, as the application does not enforce proper security boundaries for file handling operations.
The operational impact of CVE-2008-6568 extends beyond simple code execution to encompass full system compromise and data exfiltration capabilities. Attackers can upload malicious web shells, backdoors, or other exploit payloads that persist on the server long after the initial breach, providing persistent access to the compromised environment. The vulnerability's exploitation timeline is particularly concerning as it requires minimal effort from threat actors, with the attack vector being straightforward: upload a malicious file, then request it directly. This aligns with ATT&CK technique T1190 for exploit public-facing application and T1059 for command and scripting interpreter, demonstrating how the vulnerability can be leveraged across multiple phases of an attack lifecycle. Organizations with compromised Yehe 2.0 systems face potential data breaches, service disruption, and compliance violations that could result in significant financial and reputational damage.
Mitigation strategies for CVE-2008-6568 must address both immediate remediation and long-term security architecture improvements. Organizations should implement strict file type validation by maintaining allowlists of permitted extensions rather than denylists, which are inherently flawed due to the infinite nature of potential malicious file types. The application should enforce proper file content validation through MIME type checking, file signature verification, and execution permission restrictions on upload directories. Server-side configurations must ensure that uploaded files are stored outside the web root or have appropriate access controls that prevent direct execution. Network-level protections including web application firewalls and intrusion detection systems can help detect and block suspicious upload attempts. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in legacy applications, while comprehensive patch management processes should be implemented to address known vulnerabilities in third-party software components. The vulnerability highlights the critical importance of secure coding practices and proper input validation in preventing remote code execution attacks that can lead to complete system compromise.