CVE-2020-1975 in PAN-OS
Summary
by MITRE
Missing XML validation vulnerability in the PAN-OS web interface on Palo Alto Networks PAN-OS software allows authenticated users to inject arbitrary XML that results in privilege escalation. This issue affects PAN-OS 8.1 versions earlier than PAN-OS 8.1.12 and PAN-OS 9.0 versions earlier than PAN-OS 9.0.6. This issue does not affect PAN-OS 7.1, PAN-OS 8.0, or PAN-OS 9.1 or later versions.
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Analysis
by VulDB Data Team • 03/30/2024
The vulnerability identified as CVE-2020-1975 represents a critical security flaw within the Palo Alto Networks PAN-OS web interface that stems from inadequate XML validation mechanisms. This issue specifically impacts the authentication and authorization processes within the firewall management system, creating a pathway for privilege escalation that could be exploited by authenticated users who possess legitimate access credentials. The vulnerability resides in the software's handling of XML data structures, which are commonly used for configuration management and administrative operations within the PAN-OS environment. The flaw allows attackers to inject malformed XML content that bypasses normal validation checks, potentially enabling them to execute commands with elevated privileges beyond their intended access levels.
The technical implementation of this vulnerability involves the web interface's insufficient input sanitization when processing XML requests submitted through the administrative console. This missing validation creates an injection vector where authenticated users can craft malicious XML payloads that manipulate the system's internal state. The vulnerability is particularly concerning because it leverages the trust relationship between legitimate users and the system, making detection more challenging since the attacks appear to originate from authorized accounts. According to CWE classification, this represents a weakness in the validation of XML data structures, specifically falling under CWE-20: Improper Input Validation. The attack vector aligns with ATT&CK technique T1078.004: Valid Accounts, as it exploits legitimate authentication mechanisms to gain unauthorized privileges within the system.
The operational impact of this vulnerability extends beyond simple privilege escalation, potentially allowing attackers to modify firewall rules, access sensitive configuration data, and compromise the overall security posture of the network infrastructure. Organizations utilizing affected PAN-OS versions face significant risk as attackers could manipulate security policies, disable logging mechanisms, or create backdoor access points within the firewall configuration. The vulnerability affects specific version ranges including PAN-OS 8.1 prior to 8.1.12 and PAN-OS 9.0 prior to 9.0.6, indicating that the issue was introduced in specific code branches and subsequently patched in later releases. This targeted impact means that organizations maintaining older versions must urgently assess their exposure and implement appropriate mitigations. The vulnerability's presence in the web interface components specifically affects administrative functions, making it particularly dangerous for environments where multiple administrators have access to the management console.
Mitigation strategies for CVE-2020-1975 primarily focus on immediate software updates to the patched versions of PAN-OS, specifically PAN-OS 8.1.12 and 9.0.6, which contain the necessary XML validation fixes. Organizations should also implement network segmentation to limit access to the PAN-OS web interface, restricting administrative access to trusted networks and implementing multi-factor authentication for all administrative accounts. Monitoring for unusual administrative activities and implementing strict access controls through the principle of least privilege can help detect potential exploitation attempts. Additionally, organizations should conduct thorough security assessments of their PAN-OS configurations to identify any potential unauthorized changes that might have occurred during the vulnerability window. The remediation process should include validating all firewall configurations and ensuring that only authorized personnel have access to the administrative interfaces. Regular security audits and continuous monitoring of administrative logs should be implemented to detect anomalous behavior that might indicate exploitation attempts. Organizations should also consider implementing network access controls that restrict direct access to the firewall management interfaces from untrusted networks, reducing the attack surface for this particular vulnerability.