CVE-2014-3815 in Junos
Summary
by MITRE
Juniper Junos 12.1X46 before 12.1X46-D20 and 12.1X47 before 12.1X47-D10 on SRX Series devices allows remote attackers to cause a denial of service (flowd crash) via a crafted SIP packet.
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Analysis
by VulDB Data Team • 02/08/2022
The vulnerability identified as CVE-2014-3815 affects Juniper Junos operating system versions 12.1X46 prior to 12.1X46-D20 and 12.1X47 prior to 12.1X47-D10 running on SRX Series devices. This flaw represents a significant security weakness that enables remote attackers to execute a denial of service attack against network infrastructure. The vulnerability specifically targets the flowd process which is responsible for flow monitoring and reporting within the Junos operating system. When a maliciously crafted SIP packet is received by an affected SRX device, it triggers a critical system crash that results in complete service disruption.
The technical mechanism behind this vulnerability involves improper input validation within the SIP packet processing module of the flowd daemon. The flaw occurs when the system encounters a specially constructed SIP packet that contains malformed or unexpected data structures that the flowd process cannot properly handle. This processing error leads to a memory corruption condition that causes the flowd service to terminate unexpectedly, creating a cascading failure that affects the overall network device functionality. The vulnerability demonstrates a classic buffer overflow or memory management issue that falls under the CWE-121 category of stack-based buffer overflow, though the specific implementation likely involves heap corruption or improper memory handling patterns.
From an operational perspective, this vulnerability poses a severe risk to network availability and business continuity for organizations relying on Juniper SRX Series devices for their security infrastructure. The remote nature of the attack means that adversaries can exploit this weakness from outside the network perimeter without requiring physical access or authentication credentials. The impact extends beyond simple service interruption as the flowd crash affects flow monitoring capabilities, which are critical for network security operations, traffic analysis, and compliance reporting. Network administrators lose visibility into traffic patterns and potential security incidents, creating a significant operational gap that undermines the device's primary security function.
The attack vector specifically targets Session Initiation Protocol implementations within the SRX device's packet processing pipeline, making it particularly dangerous for organizations that rely on SIP-based communications for voice over IP services. The vulnerability aligns with ATT&CK technique T1498 which covers network denial of service attacks, and represents a critical weakness in the device's input validation controls. Organizations using affected Junos versions face the risk of sustained service disruption that could last until manual intervention occurs to restart the flowd process or apply the necessary security patches.
Mitigation strategies for CVE-2014-3815 primarily involve applying the vendor-provided security patches and updates that address the specific flowd processing flaw. Juniper released fixed versions of the Junos operating system that include proper input validation mechanisms for SIP packet handling. Network administrators should also implement network segmentation and access controls to limit exposure, while deploying intrusion detection systems that can identify and block suspicious SIP traffic patterns. Additionally, organizations should consider implementing redundant network paths and failover mechanisms to minimize the impact of potential service disruptions. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates the critical need for robust input validation in network infrastructure devices that process external traffic.