CVE-2016-1274 in Junos
Summary
by MITRE
Juniper Junos OS 14.1X53 before 14.1X53-D30 on QFX Series switches allows remote attackers to cause a denial of service (PFE panic) via a high rate of unspecified VXLAN packets.
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Analysis
by VulDB Data Team • 04/29/2019
The vulnerability identified as CVE-2016-1274 affects Juniper Junos OS version 14.1X53 before 14.1X53-D30 specifically on QFX Series switches, representing a significant denial of service weakness that can be exploited remotely by attackers. This flaw manifests when the switch receives a high volume of unspecified VXLAN packets, leading to a critical system failure known as PFE panic. The vulnerability resides in the packet processing mechanism of the QFX Series hardware, where the Packet Forwarding Engine fails to properly handle excessive VXLAN traffic patterns, ultimately causing the switch to become unresponsive and requiring manual intervention to restore functionality.
The technical implementation of this vulnerability demonstrates a classic resource exhaustion attack vector where malicious actors can flood the switch with VXLAN packets at a rate sufficient to overwhelm the PFE processing capabilities. VXLAN (Virtual Extensible Virtual Local Area Network) is a network virtualization technology that encapsulates Layer 2 frames within Layer 3 UDP packets, and when processed in excessive quantities, the switch's forwarding engine becomes overwhelmed. This vulnerability aligns with CWE-400, which classifies resource exhaustion flaws in network devices, and represents a specific implementation weakness in the packet processing pipeline of the Juniper QFX Series hardware. The PFE panic occurs at the hardware level, indicating that the issue cannot be resolved through simple software patches alone and requires either a firmware update or complete system reboot to restore normal operations.
From an operational perspective, this vulnerability presents a severe risk to network infrastructure reliability and availability, particularly in data center environments where QFX Series switches serve as critical forwarding devices. The remote exploitation capability means that attackers can initiate the denial of service condition from outside the network perimeter, potentially disrupting business-critical applications and services that depend on these switches for connectivity. Network administrators face the challenge of detecting and mitigating such attacks without prior knowledge of the specific packet patterns that trigger the vulnerability, making it particularly dangerous in production environments where network stability is paramount. The impact extends beyond simple service disruption as the PFE panic can result in complete network outages that may require extended downtime for recovery, affecting availability and potentially leading to financial losses.
Mitigation strategies for CVE-2016-1274 primarily involve applying the official Juniper security patches released as part of the 14.1X53-D30 software update, which addresses the packet processing logic to properly handle VXLAN traffic. Network administrators should also implement rate limiting mechanisms on VXLAN traffic at network boundaries and consider deploying intrusion detection systems that can identify and block excessive VXLAN packet flows. The remediation process should include thorough testing in non-production environments before deployment to ensure compatibility with existing network configurations. Organizations should also establish monitoring procedures to detect unusual VXLAN traffic patterns that could indicate attempted exploitation of this vulnerability. From an ATT&CK framework perspective, this vulnerability maps to techniques involving denial of service and resource exhaustion, specifically targeting network infrastructure components and representing a critical weakness in network device security that requires immediate attention and patch management protocols.