CVE-2015-5363 in Junos
Summary
by MITRE
The SRX Network Security Daemon (nsd) in Juniper SRX Series services gateways with Junos 12.1X44 before 12.1X44-D50, 12.1X46 before 12.1X46-D35, 12.1X47 before 12.1X47-D25, and 12.3X48 before 12.3X48-D15 allows remote DNS servers to cause a denial of service (crash) via a crafted DNS response.
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Analysis
by VulDB Data Team • 11/23/2024
The vulnerability identified as CVE-2015-5363 affects the SRX Network Security Daemon (nsd) component within Juniper SRX Series services gateways running specific versions of the Junos operating system. This issue represents a critical denial of service weakness that can be exploited by remote attackers through manipulation of DNS responses, potentially leading to complete service disruption on affected network devices. The vulnerability specifically impacts devices running Junos versions 12.1X44 before 12.1X44-D50, 12.1X46 before 12.1X46-D35, 12.1X47 before 12.1X47-D25, and 12.3X48 before 12.3X48-D15, making it a widespread concern across multiple software release lines.
The technical flaw resides in how the nsd daemon processes DNS responses from remote servers, where crafted malicious DNS responses can trigger unexpected behavior in the daemon's processing logic. This vulnerability falls under the category of improper input validation and memory handling issues, aligning with CWE-121 and CWE-125 which address buffer overflow conditions and improper handling of input data. The daemon fails to properly validate or sanitize incoming DNS response packets, allowing specially crafted responses to cause memory corruption or unexpected program termination. When the daemon encounters these malformed responses during normal DNS resolution operations, it crashes and restarts, leading to service interruption for network traffic passing through the affected gateway.
The operational impact of this vulnerability extends beyond simple service disruption as it can affect network availability and reliability for organizations relying on Juniper SRX Series devices for their security infrastructure. Network administrators may experience unexpected downtime, increased network latency, and potential security gaps during the recovery period when the device is rebooting. The vulnerability is particularly concerning because it can be exploited remotely without authentication, making it accessible to any attacker who can intercept DNS traffic or manipulate DNS servers within the network scope. This characteristic places the vulnerability in the ATT&CK framework under the T1499.004 technique for network denial of service attacks, which specifically targets network infrastructure components to cause availability disruption.
Organizations affected by this vulnerability should prioritize immediate remediation through official Juniper software updates and patches addressing the specific version ranges mentioned. The recommended mitigation strategy includes applying the latest Junos software releases that contain fixes for the nsd daemon's DNS response handling. Network security teams should also implement monitoring solutions to detect unusual DNS traffic patterns that might indicate exploitation attempts. Additionally, implementing DNS security measures such as DNSSEC validation and configuring the device to limit DNS response processing can provide additional defense-in-depth. The vulnerability demonstrates the importance of proper input validation in network security appliances and highlights the need for regular security updates to address memory handling issues that can lead to denial of service conditions. Organizations should also consider implementing network segmentation to limit the impact of such vulnerabilities and maintain comprehensive incident response procedures for handling security events affecting network infrastructure components.