CVE-2018-18652 in NetBackup Appliance
Summary
by MITRE
A remote command execution vulnerability in Veritas NetBackup Appliance before 3.1.2 allows authenticated administrators to execute arbitrary commands as root. This issue was caused by insufficient filtering of user provided input.
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Analysis
by VulDB Data Team • 04/06/2020
The vulnerability identified as CVE-2018-18652 represents a critical remote command execution flaw within Veritas NetBackup Appliance software versions prior to 3.1.2. This security weakness specifically targets authenticated administrative users who possess valid credentials to access the appliance management interface. The vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-provided data before processing, creating a pathway for malicious command injection attacks. Security researchers have classified this issue as a severe threat due to its potential to allow attackers with administrative privileges to escalate their access to the root level of the system, thereby gaining complete control over the appliance's underlying operating environment.
The technical implementation of this vulnerability resides in the appliance's handling of user input within administrative functions that process commands or configuration parameters. When authenticated administrators interact with specific management interfaces or APIs, the system fails to adequately filter or escape input values that could contain malicious command sequences. This insufficient input validation creates a command injection vector where specially crafted parameters can bypass normal security controls and execute arbitrary system commands with the highest possible privileges. The vulnerability specifically affects the appliance's administrative subsystem where user-provided data is directly incorporated into system execution contexts without proper sanitization, making it susceptible to exploitation by attackers who have already obtained administrative credentials.
The operational impact of CVE-2018-18652 extends beyond simple privilege escalation to encompass complete system compromise and potential data exfiltration capabilities. An attacker who successfully exploits this vulnerability can execute commands as the root user, effectively gaining unrestricted access to all system resources, files, and network interfaces available to the appliance. This level of access enables the attacker to modify system configurations, install malicious software, extract sensitive backup data, or establish persistent access points within the network infrastructure. The vulnerability particularly affects organizations relying on Veritas NetBackup Appliance for critical data protection services, as compromise of these systems can result in significant business disruption and potential regulatory violations. Organizations with extensive backup infrastructure deployments face the highest risk, as these appliances often serve as central points for data recovery and disaster recovery operations.
Mitigation strategies for this vulnerability require immediate implementation of the vendor-provided security patch for Veritas NetBackup Appliance version 3.1.2 or later, which addresses the input validation deficiencies through proper sanitization mechanisms. Organizations should also implement network segmentation and access controls to limit administrative access to these critical systems, ensuring that only authorized personnel can reach the appliance management interfaces. Security monitoring should be enhanced to detect unusual command execution patterns or suspicious administrative activities that might indicate exploitation attempts. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all instances of the affected appliance versions within their infrastructure and ensure proper patch management processes are in place to maintain system security. The vulnerability aligns with CWE-77 and CWE-88 categories related to command injection and input validation failures, and represents a significant concern under ATT&CK framework's privilege escalation and command and control tactics.