CVE-2024-3382 in PAN-OS
Summary
by MITRE • 04/10/2024
A memory leak exists in Palo Alto Networks PAN-OS software that enables an attacker to send a burst of crafted packets through the firewall that eventually prevents the firewall from processing traffic. This issue applies only to PA-5400 Series devices that are running PAN-OS software with the SSL Forward Proxy feature enabled.
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Analysis
by VulDB Data Team • 04/10/2024
The vulnerability identified as CVE-2024-3382 represents a critical memory leak condition within Palo Alto Networks PAN-OS software affecting specific hardware models. This weakness manifests when the SSL Forward Proxy feature is actively enabled on PA-5400 Series devices, creating a scenario where malicious actors can exploit the system's memory management through carefully crafted network traffic patterns. The vulnerability operates at the network layer and leverages the firewall's SSL inspection capabilities to consume system resources progressively until the device can no longer process legitimate network traffic effectively.
The technical flaw stems from insufficient memory management within the SSL Forward Proxy implementation, where allocated memory buffers are not properly released or recycled after processing SSL traffic. This memory leak occurs specifically during the handling of encrypted traffic that requires deep packet inspection and decryption for security policy enforcement. Attackers can trigger this condition by sending bursts of specially formatted packets that activate the SSL inspection process repeatedly, causing the system to accumulate unreleased memory segments over time. The vulnerability is classified under CWE-401 as a failure to release memory resources, which directly impacts system availability and performance. The attack vector requires network access to the firewall and specifically targets the SSL Forward Proxy functionality, making it a sophisticated denial-of-service threat.
The operational impact of this vulnerability extends beyond simple service disruption, as it can lead to complete firewall failure and network segmentation. When the memory leak reaches critical levels, the PA-5400 Series device becomes unable to process new network connections or maintain existing sessions, effectively creating a network outage that can span multiple security zones. This condition affects network availability and can compromise security posture by preventing the firewall from enforcing security policies during critical traffic processing periods. The vulnerability's impact is particularly severe in enterprise environments where these devices serve as primary network security gateways, potentially allowing attackers to bypass security controls while the firewall is incapacitated. The attack can be executed with minimal resources and requires no authentication, making it an attractive vector for adversaries seeking to disrupt network operations.
Mitigation strategies for CVE-2024-3382 must address both immediate operational concerns and long-term security posture improvements. The most effective immediate response involves disabling the SSL Forward Proxy feature on affected devices until a vendor patch is applied, though this may require careful network planning to maintain security policies. Organizations should implement network monitoring to detect unusual memory consumption patterns and establish alerting mechanisms for memory usage thresholds. The ATT&CK framework categorizes this vulnerability under T1499.004 for Network Denial of Service, emphasizing the need for defensive measures including traffic filtering and rate limiting to prevent exploitation. Additionally, implementing proper memory management monitoring and establishing regular system health checks can help detect early signs of memory exhaustion before complete service failure occurs. Security teams should also consider implementing redundant firewall configurations and failover mechanisms to maintain network availability during remediation periods.