CVE-2005-3502 in Helpdesk
Summary
by MITRE
attachment_send.php in Cerberus Helpdesk allows remote attackers to view attachments and tickets of other users via a modified file_id parameter.
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Analysis
by VulDB Data Team • 07/13/2018
The vulnerability identified as CVE-2005-3502 affects Cerberus Helpdesk software, specifically targeting the attachment_send.php component that handles file attachment retrieval. This represents a critical access control flaw that undermines the fundamental security assumptions of the helpdesk system's user isolation mechanisms. The vulnerability stems from insufficient input validation and authentication checks within the file_id parameter processing logic, allowing malicious actors to manipulate the parameter and gain unauthorized access to sensitive data belonging to other users within the same helpdesk instance.
The technical implementation of this vulnerability resides in the improper handling of user permissions during attachment retrieval operations. When a user requests an attachment through the attachment_send.php script, the system should verify that the requesting user has appropriate authorization to access the specified file_id. However, the flaw allows attackers to modify the file_id parameter to reference attachments belonging to different users, bypassing the intended access controls. This type of vulnerability maps directly to CWE-285: Improper Authorization, which specifically addresses situations where systems fail to properly verify that users are authorized to perform requested operations. The vulnerability essentially creates a path traversal-like condition within the attachment system where user context is not properly maintained or validated during file access requests.
The operational impact of this vulnerability extends beyond simple data exposure, as it enables comprehensive unauthorized access to the helpdesk's ticketing system data. Attackers can potentially access sensitive customer information, private communications, and business-critical data contained within the helpdesk's attachment storage. This represents a significant breach of data confidentiality and could lead to severe consequences including regulatory violations, compliance breaches, and potential legal ramifications. The vulnerability affects the integrity of the entire helpdesk system's user isolation model, undermining trust in the platform's security controls and potentially exposing multiple users' data simultaneously.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and access control mechanisms throughout the helpdesk system. The primary fix involves strengthening the file_id parameter validation to ensure that users can only access attachments associated with their own tickets or those explicitly granted access by system administrators. This requires implementing proper user context checking before any attachment retrieval operations, ensuring that the requesting user's permissions are verified against the target file's ownership and access restrictions. Security controls should also include proper logging of attachment access attempts to detect potential exploitation attempts, and regular security audits of access control mechanisms to identify similar vulnerabilities. Organizations should also consider implementing principle of least privilege access controls and regular security assessments to prevent similar authorization bypass vulnerabilities from emerging in other components of the helpdesk system. This vulnerability highlights the importance of proper access control implementation and demonstrates how seemingly simple parameter manipulation can lead to significant data exposure risks, aligning with ATT&CK technique T1078: Valid Accounts and T1566: Phishing, as attackers may use such vulnerabilities to gain access to sensitive data without detection.