CVE-2015-6531 in PAN-OS
Summary
by MITRE
Palo Alto Networks Panorama VM Appliance with PAN-OS before 6.0.1 might allow remote attackers to execute arbitrary Python code via a crafted firmware image file.
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Analysis
by VulDB Data Team • 12/26/2020
The vulnerability identified as CVE-2015-6531 affects the Palo Alto Networks Panorama VM Appliance running PAN-OS versions prior to 6.0.1, representing a critical remote code execution flaw that could enable attackers to gain unauthorized control over affected systems. This vulnerability specifically manifests through the firmware update process, where a maliciously crafted firmware image file can be used to inject and execute arbitrary Python code on the target appliance. The issue stems from insufficient input validation and sanitization within the firmware image processing mechanism, creating a pathway for attackers to bypass normal security controls and execute malicious payloads with the privileges of the affected system.
The technical exploitation of this vulnerability occurs during the firmware update procedure, where the Panorama appliance fails to properly validate the integrity and contents of firmware image files before processing them. Attackers can craft a specially designed firmware image that contains malicious Python code, which when loaded by the appliance during the update process, gets executed in the context of the appliance's operating environment. This represents a classic code injection vulnerability that allows for arbitrary code execution, potentially enabling attackers to establish persistent access, escalate privileges, or deploy additional malicious tools. The vulnerability is particularly dangerous because it operates at the firmware level, meaning it can bypass traditional application-level security controls and potentially affect the core system functionality.
The operational impact of this vulnerability extends beyond simple remote code execution, as it could lead to complete system compromise and unauthorized access to sensitive network infrastructure data. Organizations relying on Panorama appliances for network security management could face significant security breaches, including potential data exfiltration, network infiltration, and disruption of critical security operations. The vulnerability affects the management plane of the network security infrastructure, potentially allowing attackers to manipulate security policies, disable protective measures, or use the compromised appliance as a pivot point for attacking other systems within the network. This type of vulnerability directly impacts the availability, confidentiality, and integrity of network security operations, making it a critical concern for enterprise security teams.
Organizations should immediately implement mitigations including updating to PAN-OS version 6.0.1 or later, which contains the necessary patches to address the firmware image validation issues. Network administrators should also implement additional security controls such as network segmentation to limit access to Panorama appliances, implement strict firmware update procedures with proper digital signature verification, and monitor for suspicious update activities. The vulnerability aligns with CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and relates to ATT&CK technique T1059.006 for "Python", indicating the specific attack vector and execution method. Security teams should also consider implementing network monitoring to detect unusual firmware update patterns and establish secure firmware distribution channels to prevent unauthorized modifications to system images.