CVE-2024-8691 in PAN-OS
Summary
by MITRE • 09/11/2024
A vulnerability in the GlobalProtect portal in Palo Alto Networks PAN-OS software enables a malicious authenticated GlobalProtect user to impersonate another GlobalProtect user. Active GlobalProtect users impersonated by an attacker who is exploiting this vulnerability are disconnected from GlobalProtect. Upon exploitation, PAN-OS logs indicate that the impersonated user authenticated to GlobalProtect, which hides the identity of the attacker.
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Analysis
by VulDB Data Team • 09/11/2024
This vulnerability resides within the GlobalProtect portal functionality of Palo Alto Networks PAN-OS software, representing a critical authorization flaw that undermines the integrity of user authentication processes. The vulnerability specifically affects the authentication token management system where a malicious authenticated user can exploit a flaw in the session handling mechanism to assume the identity of another legitimate GlobalProtect user. This type of vulnerability falls under the category of privilege escalation and identity impersonation, which is classified as CWE-287 in the Common Weakness Enumeration framework. The attack vector requires an initial authenticated foothold within the GlobalProtect system, meaning that the attacker must first establish a valid session before attempting to exploit this weakness.
The technical implementation of this vulnerability stems from insufficient validation of session tokens and user identity verification during the authentication process. When a malicious user operates within the GlobalProtect portal, the system fails to properly validate that the session token corresponds to the legitimate user attempting to access resources. This flaw allows an attacker to manipulate session data or tokens to redirect authentication requests to target other users within the same system. The mechanism operates by exploiting the way PAN-OS handles session identifiers and user context switching, potentially through manipulation of HTTP headers, cookie values, or API parameters that control user authentication states.
The operational impact of this vulnerability extends beyond simple identity theft, as it creates a sophisticated attack scenario where the compromised users remain unaware of the impersonation occurring. Active GlobalProtect users who are targeted by this attack experience forced disconnections from the system, which serves as a clear indicator that an unauthorized party is attempting to assume their session. This disruption creates both operational inconvenience and potential security concerns, as users may be unaware that their sessions were compromised until they are disconnected and must re-authenticate. The logging behavior of PAN-OS exacerbates the threat by showing that the impersonated user successfully authenticated to GlobalProtect, effectively masking the attacker's true identity and creating a false audit trail that complicates incident response and forensic analysis.
From a threat modeling perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1566 tactic for credential access and T1078 for valid accounts. The attack pattern demonstrates how an authenticated attacker can leverage their existing credentials to escalate privileges and impersonate other users within the same system. The vulnerability creates an attack surface that allows for lateral movement and potential privilege escalation within the network infrastructure, as GlobalProtect users typically have access to sensitive network resources. Security professionals should note that this vulnerability can be particularly dangerous in environments where GlobalProtect serves as a primary gateway for remote access to corporate networks, as it can enable attackers to gain access to sensitive data and systems that would normally be protected by user authentication controls.
Organizations should implement immediate mitigations including enhanced monitoring of authentication logs for unusual patterns, implementation of multi-factor authentication for GlobalProtect users, and regular review of session management configurations. Network segmentation and access controls should be reviewed to limit the potential impact of successful impersonation attempts. Additionally, regular security assessments should be conducted to identify similar vulnerabilities in session management and authentication systems. The vulnerability highlights the importance of proper session token validation and user identity verification mechanisms, which are fundamental requirements in secure system design. Organizations should also consider implementing automated alerting systems that can detect unauthorized session takeover attempts and provide immediate notification to security teams when suspicious authentication patterns are detected, as this vulnerability can be exploited without generating obvious network-level alerts.