CVE-2017-8859 in NetBackup Appliance
Summary
by MITRE
In Veritas NetBackup Appliance 3.0 and earlier, unauthenticated users can execute arbitrary commands as root.
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Analysis
by VulDB Data Team • 12/22/2020
The vulnerability identified as CVE-2017-8859 represents a critical remote code execution flaw within Veritas NetBackup Appliance versions 3.0 and earlier. This security weakness stems from insufficient authentication mechanisms that allow unauthorized users to bypass access controls and gain administrative privileges. The flaw specifically enables unauthenticated attackers to execute arbitrary commands with root-level permissions, fundamentally compromising the security posture of affected systems. The vulnerability exists within the appliance's web-based management interface where proper authentication checks are either missing or inadequately implemented, creating a direct pathway for malicious actors to assume complete control over the system.
The technical implementation of this vulnerability involves a failure in the authentication process where the system does not properly validate user credentials before executing privileged operations. Attackers can exploit this by directly accessing specific endpoints within the appliance's web interface without providing any authentication tokens or credentials. This allows them to submit malicious payloads that are then executed with the highest system privileges, effectively granting them complete administrative control. The flaw demonstrates a classic security misconfiguration where authentication controls are bypassed through predictable URI access patterns or insufficient input validation in the web application layer. According to CWE classification, this vulnerability maps to CWE-287 which addresses improper authentication issues, while the ATT&CK framework categorizes this under T1078 for valid accounts and T1059 for command and scripting interpreter techniques.
The operational impact of CVE-2017-8859 is severe and far-reaching for organizations utilizing affected NetBackup appliances. Successful exploitation can result in complete system compromise, data exfiltration, and potential lateral movement within network environments where backup systems are deployed. Since NetBackup appliances typically handle critical backup and recovery operations, attackers can manipulate backup processes to hide malicious activities, corrupt backup data, or establish persistent access points. The vulnerability affects not only individual appliance security but also the broader backup infrastructure, potentially allowing attackers to compromise multiple systems through backup repositories. Organizations may face regulatory compliance violations, data breaches, and significant operational disruption when this vulnerability is exploited in production environments.
Mitigation strategies for CVE-2017-8859 primarily involve upgrading to Veritas NetBackup Appliance versions that address this authentication flaw. Organizations should immediately implement network segmentation to isolate backup appliances from general network access and restrict web interface access to trusted administrative networks only. Additional protective measures include disabling unnecessary web services, implementing robust firewall rules to limit access to specific IP addresses, and deploying intrusion detection systems to monitor for suspicious access patterns. Security teams should also conduct comprehensive vulnerability assessments to identify any systems that may have been compromised and implement multi-factor authentication mechanisms where possible. Regular security audits and patch management processes should be enhanced to ensure timely remediation of similar vulnerabilities in backup and storage infrastructure components. Organizations should consider implementing network monitoring solutions that can detect unauthorized access attempts and command execution patterns associated with this type of exploitation.