CVE-2017-10607 in Junos
Summary
by MITRE
Juniper Networks Junos OS 16.1R1, and services releases based off of 16.1R1, are vulnerable to the receipt of a crafted BGP Protocol Data Unit (PDU) sent directly to the router, which can cause the RPD routing process to crash and restart. Unlike BGP UPDATEs, which are transitive in nature, this issue can only be triggered by a packet sent directly to the IP address of the router. Repeated crashes of the rpd daemon can result in an extended denial of service condition. This issue only affects devices running Junos OS 16.1R1 and services releases based off of 16.1R1 (e.g. 16.1R1-S1, 16.1R1-S2, 16.1R1-S3). No prior versions of Junos OS are affected by this vulnerability, and this issue was resolved in Junos OS 16.2 prior to 16.2R1. No other Juniper Networks products or platforms are affected by this issue. This issue was found during internal product security testing.
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Analysis
by VulDB Data Team • 01/03/2023
The vulnerability identified as CVE-2017-10607 represents a critical flaw in Juniper Networks Junos OS version 16.1R1 and its subsequent service releases including 16.1R1-S1 through 16.1R1-S3. This issue specifically targets the Routing Process Daemon (RPD) which is responsible for handling routing protocols within the Junos operating system. The vulnerability manifests when the router receives a specially crafted BGP Protocol Data Unit (PDU) directly sent to its IP address, bypassing normal routing protocol mechanisms that would typically filter or validate such packets. Unlike standard BGP UPDATE messages which are designed to be transitive and forwarded through the network, this vulnerability can only be exploited through direct packets sent to the router's specific IP address, making it particularly concerning for network infrastructure devices that must remain accessible and responsive.
The technical exploitation of this vulnerability occurs through improper handling of malformed BGP PDUs within the RPD process, leading to a segmentation fault or similar memory corruption issue that causes the daemon to crash and automatically restart. This type of vulnerability falls under CWE-121, which describes heap-based buffer overflow conditions, or potentially CWE-122 for buffer overflow in stack-based memory. The crash behavior creates a cascading effect where repeated exploitation can lead to sustained denial of service conditions, as the RPD daemon continuously restarts and reinitializes its routing processes. The impact is particularly severe because the RPD daemon is fundamental to routing operations, and its instability directly affects the router's ability to maintain routing tables and forward packets through the network infrastructure.
From an operational perspective, this vulnerability presents significant risks to network availability and stability, as demonstrated by the potential for extended denial of service conditions. The fact that this issue only affects specific service releases of Junos OS 16.1R1 means that organizations running these versions are particularly vulnerable, while those on older versions or newer 16.2 releases are protected. The vulnerability's exploitation requires direct access to the router's IP address, which aligns with ATT&CK technique T1210 for gaining access to a system through network-based attacks, though the attack vector is more specific to routing protocol manipulation rather than general network infiltration. Network administrators must understand that this vulnerability does not affect other Juniper products or platforms, limiting its scope but not reducing its impact on affected systems.
The remediation approach for this vulnerability involves upgrading to Junos OS version 16.2 or later, where the issue has been resolved through proper validation and handling of BGP PDUs within the RPD process. Organizations should implement immediate mitigation strategies including network segmentation to limit direct access to router IP addresses, deployment of network access control lists to filter suspicious BGP traffic, and monitoring for unusual restart patterns of the RPD daemon. Security teams should also consider implementing network-based intrusion detection systems that can identify and alert on malformed BGP PDUs, as the vulnerability can be exploited without requiring authentication or advanced privileges. The resolution of this issue in the 16.2 release demonstrates Juniper's commitment to addressing security flaws, though organizations must ensure proper patch management procedures are in place to prevent exploitation of similar vulnerabilities in the future.