CVE-2009-4824 in Kolab Server
Summary
by MITRE
Unspecified vulnerability in Kolab Webclient before 1.2.0 in Kolab Server before 2.2.3 allows attackers to have an unspecified impact via vectors related to an "image upload form."
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/08/2021
The vulnerability identified as CVE-2009-4824 resides within the Kolab Webclient component of the Kolab email server suite, specifically affecting versions prior to 1.2.0 and the broader Kolab Server versions before 2.2.3. This security flaw manifests within the image upload functionality of the web interface, representing a critical weakness that could potentially be exploited by malicious actors to compromise the system. The unspecified nature of the vulnerability's impact suggests that attackers could leverage the image upload form to execute various malicious activities, though the exact scope of potential exploitation remains partially obscured in the initial reporting. The vulnerability's classification as a web application security flaw indicates that it operates within the context of web-based user interactions and could potentially affect users who engage with the Kolab Server's web interface for email and collaboration services.
The technical implementation of this vulnerability appears to stem from inadequate input validation and sanitization within the image upload form processing logic. When users attempt to upload images through the web interface, the system fails to properly validate or sanitize the uploaded file content, creating opportunities for attackers to submit malicious files that could trigger unintended behavior within the application. This weakness likely falls under the category of file upload vulnerabilities, which are commonly classified as CWE-434 within the Common Weakness Enumeration framework. The absence of proper file type checking, size limitations, and content validation mechanisms allows attackers to potentially upload executable code, malicious scripts, or specially crafted files that could be interpreted and executed by the web server or application. The vulnerability's location within the image upload form suggests that the system may be improperly handling file extensions, MIME types, or file contents during the upload process, potentially allowing attackers to bypass security measures designed to prevent such malicious uploads.
The operational impact of this vulnerability extends beyond simple data compromise, as it could potentially allow attackers to achieve arbitrary code execution on the Kolab Server, leading to complete system compromise. The attack surface for this vulnerability is particularly concerning given that Kolab Server serves as a comprehensive email and collaboration platform, making it a valuable target for attackers seeking persistent access to organizational communication systems. Successful exploitation could enable attackers to gain unauthorized access to user email accounts, calendar data, contacts, and other sensitive collaboration information stored within the Kolab environment. The vulnerability's potential for privilege escalation or lateral movement within the network makes it particularly dangerous, as attackers could use the compromised system as a foothold to target other systems within the organization. Additionally, the vulnerability could be exploited to establish persistent backdoors or to deploy additional malware, making it a significant threat to the overall security posture of organizations relying on Kolab Server for their email infrastructure.
Mitigation strategies for CVE-2009-4824 should focus on immediate patching and implementation of comprehensive security controls. Organizations should prioritize upgrading to Kolab Server version 2.2.3 and Kolab Webclient version 1.2.0 or later, where the vulnerability has been addressed through proper input validation and sanitization of uploaded files. Beyond patching, administrators should implement additional security measures including strict file type validation, content scanning of uploaded files, and proper file storage segregation to prevent execution of uploaded content. The implementation of web application firewalls and content security policies can provide additional layers of protection against exploitation attempts. Security monitoring should be enhanced to detect unusual file upload patterns or attempts to access uploaded files that may indicate exploitation activity. Organizations should also consider implementing principle of least privilege controls for file upload functionality and regularly audit user access permissions to minimize potential damage from successful exploitation attempts. These measures align with recommended practices from the ATT&CK framework, particularly in addressing techniques related to command and control, privilege escalation, and execution through web applications.