CVE-2024-0800 is a path traversal vulnerability identified in Arcserve Unified Data Protection (UDP) versions 9.2 and 8.1, specifically within the ImportNodeServlet component of the edge-app-base-webui.jar. The vulnerability arises due to insufficient validation of file upload paths, allowing an attacker to upload files with dangerous types and traverse directories outside the intended upload folder. This is categorized under CWE-434, which concerns unrestricted upload of files with dangerous types. The vulnerability can be exploited remotely over the network with low privileges (PR:L) and does not require user interaction (UI:N). The CVSS v3.1 score is 8.8, indicating a high severity with impacts on confidentiality, integrity, and availability (C:H/I:H/A:H). An attacker could leverage this flaw to write arbitrary files, potentially leading to remote code execution, privilege escalation, or disruption of backup and recovery operations. Although no known exploits are currently reported in the wild, the nature of the vulnerability and the critical role of Arcserve UDP in data protection make it a significant risk. The lack of available patches at the time of reporting necessitates immediate risk mitigation through access controls and monitoring. The vulnerability affects core backup infrastructure, which is often a high-value target for ransomware and advanced persistent threat actors.

For European organizations, the impact of CVE-2024-0800 is substantial due to the critical role Arcserve Unified Data Protection plays in backup and disaster recovery. Exploitation could lead to unauthorized file uploads that compromise backup integrity, enabling attackers to implant malicious payloads or disrupt backup operations. This could result in data loss, prolonged downtime, and potential ransomware deployment, severely affecting business continuity. Confidential data could be exposed or altered, undermining compliance with GDPR and other data protection regulations. The availability of backup services could be compromised, delaying recovery efforts after an incident. Organizations in sectors such as finance, healthcare, manufacturing, and critical infrastructure are particularly vulnerable due to their reliance on reliable backup solutions and the sensitivity of their data. The high CVSS score reflects the broad and severe impact on confidentiality, integrity, and availability, emphasizing the need for rapid remediation.

1. Apply official patches from Arcserve immediately once they become available to address the vulnerability directly. 2. Until patches are released, restrict network access to the Arcserve UDP management interface using firewalls and VPNs to limit exposure to trusted administrators only. 3. Implement strict file upload validation controls, including whitelisting allowed file types and enforcing path normalization to prevent traversal. 4. Monitor logs and network traffic for unusual file upload activities or attempts to access unauthorized directories. 5. Employ application-layer firewalls or web application firewalls (WAFs) with custom rules to detect and block path traversal attempts targeting the ImportNodeServlet. 6. Conduct regular security audits and penetration testing focused on backup infrastructure to identify and remediate similar weaknesses. 7. Educate system administrators on the risks of unrestricted file uploads and the importance of applying security updates promptly. 8. Maintain offline or immutable backups to ensure recovery capability in case of compromise.