CVE-2020-2015 in PAN-OS
Summary
by MITRE
A buffer overflow vulnerability in the PAN-OS management server allows authenticated users to crash system processes or potentially execute arbitrary code with root privileges. This issue affects: PAN-OS 7.1 versions earlier than 7.1.26; PAN-OS 8.0 versions earlier than 8.0.21; PAN-OS 8.1 versions earlier than 8.1.13; PAN-OS 9.0 versions earlier than 9.0.7; PAN-OS 9.1 versions earlier than 9.1.1.
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Analysis
by VulDB Data Team • 10/17/2020
The vulnerability described in CVE-2020-2015 represents a critical buffer overflow flaw within the PAN-OS management server component that fundamentally undermines system integrity and security posture. This issue manifests as a classic buffer overflow condition that occurs when the management server processes certain input data without proper bounds checking, allowing maliciously crafted inputs to overwrite adjacent memory regions. The vulnerability specifically targets the authentication and processing mechanisms of Palo Alto Networks firewalls, creating a pathway for authenticated attackers to exploit system memory structures and potentially escalate privileges to root level access. The affected versions span multiple major releases including PAN-OS 7.1 through 9.1, indicating this flaw persisted across several generations of the platform and affected a substantial portion of deployed firewall infrastructure.
The technical exploitation of this vulnerability leverages the fundamental principle of buffer overflow attacks where insufficient input validation allows attackers to overwrite memory locations beyond the intended buffer boundaries. When authenticated users submit specially crafted payloads to the management server, the system fails to properly validate input lengths and boundaries, enabling memory corruption that can lead to process crashes or more severe consequences. This type of vulnerability maps directly to CWE-121, which describes buffer overflow conditions where insufficient boundary checking allows data to overwrite adjacent memory locations. The attack vector requires authentication to the management interface, meaning that an attacker must first establish valid credentials to the system, but once achieved, the potential impact escalates significantly. The vulnerability's nature suggests it operates within the management plane of the firewall, affecting the core system processes that handle administrative operations and configuration management.
The operational impact of CVE-2020-2015 extends beyond simple system instability to encompass potential complete system compromise and privilege escalation. When exploited successfully, the buffer overflow can cause system processes to crash, leading to denial of service conditions that disrupt network security operations. More critically, the vulnerability's potential for arbitrary code execution with root privileges creates a pathway for attackers to gain complete control over the firewall appliance, effectively compromising the entire network security infrastructure. This represents a severe escalation from a simple denial of service to a full system compromise, as the attacker can execute commands with the highest system privileges and potentially access all network traffic processing capabilities. The management server's role as the central control point for firewall operations means that compromising this component undermines the fundamental security guarantees provided by the firewall itself.
Organizations affected by this vulnerability should prioritize immediate remediation through official PAN-OS updates that address the buffer overflow conditions in the management server component. The affected versions require patching to versions 7.1.26, 8.0.21, 8.1.13, 9.0.7, and 9.1.1 respectively, which contain the necessary code modifications to prevent the memory corruption conditions. Security teams should implement network segmentation and access controls to limit management interface exposure, reducing the attack surface for potential exploitation. Additionally, monitoring for unusual authentication patterns and system behavior should be enhanced to detect potential exploitation attempts. The vulnerability's classification under ATT&CK technique T1059.007 for command and scripting interpreter indicates that successful exploitation would likely involve command execution capabilities, making it crucial for organizations to implement comprehensive monitoring of command execution events. Regular security assessments and vulnerability scanning should be conducted to ensure all firewall components remain patched against similar memory corruption vulnerabilities, as buffer overflows often indicate broader architectural issues that may affect other system components.