CVE-2020-1987 in Networks Global Protect Agent
Summary
by MITRE
An information exposure vulnerability in the logging component of Palo Alto Networks Global Protect Agent allows a local authenticated user to read VPN cookie information when the troubleshooting logging level is set to "Dump". This issue affects Palo Alto Networks Global Protect Agent 5.0 versions prior to 5.0.9; 5.1 versions prior to 5.1.1.
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Analysis
by VulDB Data Team • 05/18/2024
The vulnerability identified as CVE-2020-1987 represents a critical information exposure flaw within the logging mechanisms of Palo Alto Networks Global Protect Agent software. This security weakness specifically targets the agent's ability to handle sensitive data during troubleshooting operations, creating a significant risk for organizations that rely on this network security solution for remote access and VPN connectivity. The vulnerability stems from improper handling of authentication tokens within the logging subsystem, where sensitive VPN cookie information becomes accessible through log files when specific debugging configurations are enabled.
The technical implementation of this flaw occurs within the Global Protect Agent's logging component where the system fails to adequately sanitize or restrict access to sensitive session data. When the troubleshooting logging level is configured to "Dump" mode, the agent persists authentication tokens and session cookies in plaintext format within log files that are accessible to local authenticated users. This represents a direct violation of information protection principles and creates an attack surface where malicious insiders or compromised local accounts can extract sensitive authentication information that would normally remain protected within secure session contexts. The vulnerability is particularly concerning because it operates at the local user level, meaning that any authenticated user with access to the system can potentially exploit this weakness without requiring additional privileges or network-level access.
The operational impact of this vulnerability extends beyond simple data exposure, as it fundamentally undermines the security posture of organizations using Palo Alto Networks Global Protect solutions. When VPN cookies are exposed through logging mechanisms, attackers can potentially hijack active sessions, impersonate legitimate users, and gain unauthorized access to corporate networks and resources. The vulnerability affects specific versions of the Global Protect Agent, particularly 5.0.x versions before 5.0.9 and 5.1.x versions before 5.1.1, indicating that organizations running these older versions face immediate risk. This exposure could enable attackers to maintain persistent access to network resources, escalate privileges through session hijacking, or conduct reconnaissance activities using stolen authentication tokens. The impact is further amplified in environments where multiple users share systems or where local privilege escalation attacks are possible, as the vulnerability creates multiple potential attack vectors for credential theft.
Organizations affected by this vulnerability should prioritize immediate remediation through the application of the vendor-provided patches and updates that address the logging component's improper handling of sensitive data. The recommended mitigation strategy includes upgrading to Global Protect Agent versions 5.0.9 or 5.1.1 and higher, which contain the necessary code modifications to prevent the exposure of VPN cookies in log files. Additionally, system administrators should review and modify logging configurations to avoid setting the troubleshooting level to "Dump" mode in production environments, as this configuration directly enables the vulnerability. Security teams should implement monitoring controls to detect unauthorized access to log files and establish regular audits of logging configurations to ensure that sensitive information is not being persisted in insecure formats. The vulnerability aligns with CWE-200, which addresses information exposure, and represents a specific instance of improper information handling within security software components. From an ATT&CK framework perspective, this vulnerability enables techniques such as credential access through credential dumping and privilege escalation by leveraging stolen session tokens, making it a significant concern for organizations implementing zero-trust security models where session integrity is paramount.