CVE-2024-30382 in Junos OS
Summary
by MITRE • 04/12/2024
An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to send a specific routing update, causing an rpd core due to memory corruption, leading to a Denial of Service (DoS).
This issue can only be triggered when the system is configured for CoS-based forwarding (CBF) with a policy map containing a cos-next-hop-map action (see below). This issue affects: Junos OS:
* all versions before 20.4R3-S10, * from 21.2 before 21.2R3-S8, * from 21.3 before 21.3R3, * from 21.4 before 21.4R3, * from 22.1 before 22.1R2;
Junos OS Evolved:
* all versions before 21.2R3-S8-EVO, * from 21.3 before 21.3R3-EVO, * from 21.4 before 21.4R3-EVO, * from 22.1 before 22.1R2-EVO.
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Analysis
by VulDB Data Team • 02/07/2025
The vulnerability identified as CVE-2024-30382 represents a critical improper handling of exceptional conditions within the routing protocol daemon rpd of Juniper Networks Junos OS and Junos OS Evolved platforms. This flaw manifests as a memory corruption issue that occurs when processing specific routing updates, ultimately resulting in a denial of service condition through rpd core dump. The vulnerability operates at the network protocol level, requiring only network-based access without authentication requirements, making it particularly dangerous for operational environments. The technical implementation involves the routing daemon's failure to properly validate or handle exceptional conditions during processing of routing information, specifically when CoS-based forwarding configurations are active.
The vulnerability specifically requires the system to be configured with Class of Service based forwarding functionality and a policy map containing a cos-next-hop-map action for exploitation to occur. This configuration dependency creates a targeted attack surface that affects organizations using advanced traffic management features. The memory corruption aspect of this vulnerability aligns with common software security weaknesses categorized under CWE-391, which deals with improper handling of exceptional conditions and can lead to resource exhaustion or system instability. The rpd daemon's failure to properly manage memory allocation during routing update processing creates a pathway for attackers to trigger system crashes through carefully crafted routing messages.
Operational impact of this vulnerability extends beyond simple service disruption to potentially compromise network stability and availability in production environments. When the rpd process crashes due to memory corruption, it affects the routing table maintenance and forwarding decisions of the affected device, potentially causing network partitions or traffic black holes. The DoS condition affects the entire routing functionality of the device, which can have cascading effects on network performance and reliability. From an adversary perspective, this vulnerability provides a straightforward method for disrupting network operations without requiring privileged access or complex attack chains, making it particularly attractive for network disruption attacks. The vulnerability's presence in multiple version ranges indicates a persistent flaw in the codebase that required multiple releases to address properly.
Mitigation strategies should focus on immediate patching of affected systems to the latest supported versions that contain the necessary code fixes. Organizations should prioritize updating their Junos OS and Junos OS Evolved devices to versions that address this specific memory handling issue in the rpd daemon. Network administrators should also consider implementing temporary network segmentation or access controls to limit exposure while patches are deployed. The vulnerability's classification under ATT&CK technique T1499.004 for network disruption aligns with broader threat actor methodologies that target network infrastructure to create operational disruptions. Additionally, implementing monitoring for abnormal routing update patterns or rpd process restarts can help detect exploitation attempts. Organizations should also review their CoS-based forwarding configurations to determine if the specific cos-next-hop-map actions are necessary, potentially reducing the attack surface by disabling unnecessary features. The vulnerability demonstrates the importance of proper exception handling in network daemon implementations and the critical need for thorough testing of routing protocol implementations under various configuration scenarios.