CVE-2023-28758 in NetBackup
Summary
by MITRE • 03/23/2023
An issue was discovered in Veritas NetBackup before 8.3.0.2. BPCD allows an unprivileged user to specify a log file path when executing a NetBackup command. This can be used to overwrite existing NetBackup log files.
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Analysis
by VulDB Data Team • 12/07/2025
The vulnerability identified as CVE-2023-28758 affects Veritas NetBackup versions prior to 8.3.0.2 and represents a significant privilege escalation and data integrity threat within enterprise backup environments. This issue resides in the BPCD service component which governs backup operations, creating a path for unauthorized file system modifications that could compromise system security and operational continuity. The flaw manifests when unprivileged users can manipulate log file paths through NetBackup command execution, enabling them to overwrite existing log files with arbitrary content.
This vulnerability directly maps to CWE-22 Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal or directory traversal attacks. The technical implementation involves the BPCD service accepting user-supplied parameters that define log file locations without proper validation or sanitization. When users execute NetBackup commands, they can specify log file paths that bypass normal access controls and directory restrictions, allowing them to target system log files that should normally be protected from modification by non-privileged accounts. This creates an attack surface where malicious actors can overwrite critical backup logs, potentially obscuring their activities or disrupting system monitoring capabilities.
The operational impact of this vulnerability extends beyond simple file overwrites and represents a serious threat to backup system integrity and forensic capabilities. Attackers could manipulate backup logs to hide unauthorized access attempts, corrupt audit trails, or disrupt backup operations by overwriting critical system logs. This vulnerability particularly affects organizations relying on NetBackup for critical data protection, as compromised logs could prevent detection of security incidents and undermine compliance requirements. The ability to overwrite log files undermines the fundamental security principle of maintaining immutable audit trails that are essential for incident response and security monitoring.
Organizations should immediately implement mitigations including upgrading to Veritas NetBackup 8.3.0.2 or later versions where this vulnerability has been addressed through proper input validation and access control enforcement. System administrators should conduct comprehensive vulnerability assessments to identify any instances where unprivileged users might have access to NetBackup command execution capabilities. Network segmentation and privilege minimization should be enforced to limit user access to backup systems, while implementing additional monitoring for unusual log file modifications and unauthorized command execution. The ATT&CK framework categorizes this as a privilege escalation technique through modification of log files, which aligns with tactics such as persistence and defense evasion. Security teams should also consider implementing file integrity monitoring solutions to detect unauthorized modifications to critical system logs, as this vulnerability represents a potential vector for maintaining persistent access while avoiding detection through log manipulation.