CVE-2017-2303 in Junos
Summary
by MITRE
On Juniper Networks products or platforms running Junos OS 12.1X46 prior to 12.1X46-D50, 12.1X47 prior to 12.1X47-D40, 12.3 prior to 12.3R13, 12.3X48 prior to 12.3X48-D30, 13.2X51 prior to 13.2X51-D40, 13.3 prior to 13.3R10, 14.1 prior to 14.1R8, 14.1X53 prior to 14.1X53-D35, 14.1X55 prior to 14.1X55-D35, 14.2 prior to 14.2R5, 15.1 prior to 15.1F6 or 15.1R3, 15.1X49 prior to 15.1X49-D30 or 15.1X49-D40, 15.1X53 prior to 15.1X53-D35, and where RIP is enabled, certain RIP advertisements received by the router may cause the RPD daemon to crash resulting in a denial of service condition.
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Analysis
by VulDB Data Team • 10/04/2020
The vulnerability identified as CVE-2017-2303 affects Juniper Networks routers running specific versions of Junos OS with RIP routing protocol enabled. This issue represents a critical denial of service weakness that can be exploited through crafted RIP advertisements, potentially disrupting network operations and compromising availability. The affected versions span multiple release branches including 12.1X46, 12.1X47, 12.3, 12.3X48, 13.2X51, 13.3, 14.1, 14.1X53, 14.1X55, 14.2, 15.1, and 15.1X49, 15.1X53, demonstrating the widespread nature of this flaw across Juniper's product line. The vulnerability specifically targets the Routing Policy Daemon (RPD) component which is responsible for processing routing information and maintaining routing tables within Juniper devices.
The technical flaw manifests when the RPD daemon receives certain RIP advertisements that trigger an improper memory handling condition or buffer overflow within the routing protocol processing logic. This condition causes the daemon to terminate unexpectedly, leading to a complete service disruption as the router can no longer process routing information or forward packets effectively. The vulnerability operates at the network layer where routing protocols are processed, making it particularly dangerous as it can be exploited remotely without requiring authentication or physical access to the device. The issue is classified as a software defect in the parsing and validation of RIP routing updates, which falls under CWE-121 for buffer overflow conditions and CWE-476 for null pointer dereference scenarios that could occur during improper memory management.
The operational impact of this vulnerability extends beyond simple service disruption as it can lead to complete network outages, especially in environments where Juniper routers serve as core infrastructure components. Network administrators may experience cascading failures as routing information becomes unavailable, potentially causing traffic to be rerouted through alternative paths or resulting in complete communication breakdowns. The vulnerability's remote exploitability means that attackers can trigger the denial of service condition from external network locations, making it particularly dangerous in production environments. This weakness directly impacts the availability aspect of the CIA triad and can be mapped to ATT&CK technique T1499.002 for network denial of service attacks, representing a significant threat to network infrastructure reliability.
Mitigation strategies for CVE-2017-2303 primarily involve applying the appropriate software patches released by Juniper Networks for each affected version. Organizations should immediately upgrade to patched versions of Junos OS as specified in the vendor advisories, ensuring that all affected routers receive the necessary updates. Network administrators should also consider implementing network segmentation to limit the attack surface and monitor for unusual routing behavior that might indicate exploitation attempts. Additional defensive measures include disabling RIP protocol where possible, implementing network access controls to limit routing advertisement sources, and establishing robust monitoring procedures for router stability and routing table changes. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates how routing protocol implementations can serve as attack vectors in network infrastructure, emphasizing the need for comprehensive vulnerability management programs and regular security assessments of network devices.