CVE-2015-4068 in UDP
Summary
by MITRE
Directory traversal vulnerability in Arcserve UDP before 5.0 Update 4 allows remote attackers to obtain sensitive information or cause a denial of service via a crafted file path to the (1) reportFileServlet or (2) exportServlet servlet.
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Analysis
by VulDB Data Team • 04/22/2026
The CVE-2015-4068 vulnerability represents a critical directory traversal flaw affecting Arcserve UDP versions prior to 5.0 Update 4. This vulnerability resides within the web application layer of the backup and recovery software, specifically targeting two key servlet components: reportFileServlet and exportServlet. The flaw enables remote attackers to manipulate file path parameters and access unauthorized system resources through carefully crafted requests. Directory traversal vulnerabilities typically occur when applications fail to properly validate user-supplied input before using it to access files or directories on the server. In this case, the vulnerability stems from insufficient input sanitization within the servlet implementations that handle report generation and data export functionalities.
The technical exploitation of this vulnerability leverages the inherent weakness in how the application processes file path parameters. Attackers can construct malicious URLs containing directory traversal sequences such as ../ or ..\ to navigate outside the intended directory boundaries. When the reportFileServlet or exportServlet processes these crafted requests, the application fails to properly validate or sanitize the input paths, allowing the attacker to traverse the file system and access sensitive files or directories that should remain protected. This vulnerability directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The attack vector is particularly dangerous because it operates over network protocols, allowing remote exploitation without requiring local system access or authentication.
The operational impact of CVE-2015-4068 extends beyond simple information disclosure to include potential denial of service conditions. Remote attackers can exploit this vulnerability to access sensitive system information including backup configurations, user credentials stored in log files, system directories, or other confidential data that should be restricted to authorized personnel only. Additionally, the vulnerability can be weaponized to cause denial of service by forcing the application to access non-existent files or by consuming excessive system resources through malformed path traversal attempts. This creates a dual threat scenario where attackers can both extract valuable intelligence and disrupt service availability. The vulnerability affects organizations using Arcserve UDP for backup and disaster recovery operations, potentially compromising the integrity of their data protection infrastructure. According to ATT&CK framework, this vulnerability aligns with T1083 (File and Directory Discovery) and T1499 (Endpoint Denial of Service) tactics, as it enables both reconnaissance activities and service disruption capabilities.
Mitigation strategies for CVE-2015-4068 should prioritize immediate patch deployment to Arcserve UDP versions 5.0 Update 4 or later, which contain the necessary fixes for the directory traversal vulnerability. Organizations should implement input validation controls at the application level, ensuring all user-supplied file paths undergo strict sanitization and validation before processing. Network segmentation and access controls should be enforced to limit exposure of the vulnerable servlet endpoints to untrusted networks. Security monitoring should be enhanced to detect anomalous file access patterns or suspicious path traversal attempts. Additionally, organizations should conduct comprehensive vulnerability assessments to identify similar issues in other applications and systems within their infrastructure. The fix implemented in the updated versions typically involves robust input validation mechanisms that prevent traversal sequences from being processed, combined with proper access control enforcement to ensure that only authorized file operations can occur. This vulnerability serves as a reminder of the critical importance of input validation and proper access controls in web applications, particularly those handling sensitive backup and recovery data.