CVE-2023-28759 in NetBackup
Summary
by MITRE • 03/23/2023
An issue was discovered in Veritas NetBackup before 10.0. A vulnerability in the way NetBackup validates the path to a DLL prior to loading may allow a lower level user to elevate privileges and compromise the system.
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Analysis
by VulDB Data Team • 12/07/2025
The vulnerability identified as CVE-2023-28759 represents a critical privilege escalation flaw within Veritas NetBackup software versions prior to 10.0. This issue stems from insufficient validation mechanisms that govern how the backup software handles dynamic link library loading operations. The flaw specifically manifests in the path validation process that occurs before a DLL is loaded into memory, creating an exploitable condition that can be leveraged by malicious actors with lower privileged access levels.
This vulnerability falls under the category of improper validation of input or parameters as classified by CWE-22, which specifically addresses issues where software fails to properly validate paths or file locations before processing them. The technical implementation flaw occurs within the NetBackup application's module loading subsystem where the software does not adequately verify the authenticity and integrity of the DLL path before executing the load operation. This weakness creates a window of opportunity for attackers to manipulate the system's dynamic loading behavior through carefully crafted file paths or symbolic links that point to malicious payloads.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with the capability to compromise entire backup infrastructure environments. Network backup systems serve as critical components in enterprise security architectures, often containing sensitive data and maintaining access to multiple system resources. When an attacker can leverage this vulnerability, they gain the ability to execute arbitrary code with elevated privileges, potentially leading to complete system compromise, data exfiltration, or the establishment of persistent backdoors within the backup environment. The implications are particularly severe given that backup systems frequently contain credentials, access keys, and other sensitive information that can be leveraged for broader network infiltration.
From a threat modeling perspective, this vulnerability aligns with techniques described in the ATT&CK framework under privilege escalation tactics, specifically targeting the execution of malicious code with elevated privileges. The attack vector typically involves an attacker with low-level user access to manipulate the DLL loading process through various means including symbolic link manipulation, path injection, or exploiting weak file permission settings. The vulnerability's exploitation requires minimal privileges initially, making it particularly dangerous as it can be leveraged by adversaries who have gained access through other attack vectors such as phishing, credential theft, or network reconnaissance.
Organizations should implement immediate mitigations including updating to Veritas NetBackup version 10.0 or later where the vulnerability has been addressed through proper path validation mechanisms. System administrators should also review and harden file permissions on backup directories, implement proper access controls, and monitor for unusual DLL loading activities through endpoint detection and response solutions. The mitigation strategy should include comprehensive security auditing of backup environments and consideration of additional layers of protection such as application whitelisting, secure coding practices for system components, and regular vulnerability assessments to identify similar path traversal or loading vulnerabilities in other critical systems.