CVE-2022-22177 in Junos OS
Summary
by MITRE • 01/19/2022
A release of illegal memory vulnerability in the snmpd daemon of Juniper Networks Junos OS, Junos OS Evolved allows an attacker to halt the snmpd daemon causing a sustained Denial of Service (DoS) to the service until it is manually restarted. This issue impacts any version of SNMP – v1,v2, v3 This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S20; 15.1 versions prior to 15.1R7-S11; 18.3 versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R2-S9, 18.4R3-S10; 19.1 versions prior to 19.1R2-S3, 19.1R3-S7; 19.2 versions prior to 19.2R1-S8, 19.2R3-S4; 19.3 versions prior to 19.3R3-S4; 19.4 versions prior to 19.4R2-S5, 19.4R3-S6; 20.1 versions prior to 20.1R3-S2; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2-S2, 21.1R3; 21.2 versions prior to 21.2R1-S2, 21.2R2. Juniper Networks Junos OS Evolved 21.2 versions prior to 21.2R3-EVO; 21.3 versions prior to 21.3R2-EVO.
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Analysis
by VulDB Data Team • 01/20/2022
The vulnerability identified as CVE-2022-22177 represents a critical memory management flaw within the snmpd daemon of Juniper Networks Junos OS and Junos OS Evolved platforms. This issue manifests as a release of illegal memory condition that fundamentally compromises the stability of the Simple Network Management Protocol daemon, creating a sustained denial of service scenario that requires manual intervention to resolve. The vulnerability affects all SNMP versions v1, v2, and v3 implementations across multiple Junos OS release lines, demonstrating the widespread nature of this memory management weakness. The flaw specifically targets the snmpd daemon's handling of memory resources during normal operational procedures, creating a condition where legitimate memory operations result in system instability rather than proper resource management.
This memory release vulnerability operates through improper memory deallocation mechanisms within the snmpd daemon's processing pipeline. When the daemon encounters specific SNMP requests or operational conditions, it executes memory release operations that violate established memory management protocols, leading to the daemon's abrupt termination. The technical implementation flaw likely stems from inadequate bounds checking or improper memory pointer management during SNMP request processing, which aligns with common software vulnerabilities classified under CWE-415: Double Free and CWE-416: Use After Free. The vulnerability's exploitation requires minimal privileges and can be executed through standard SNMP communication channels, making it particularly dangerous for network infrastructure devices where SNMP monitoring is essential for operational management.
The operational impact of this vulnerability extends beyond simple service disruption to create cascading effects within network infrastructure management systems. Network administrators relying on SNMP-based monitoring and management tools face potential complete loss of visibility into affected devices, as the snmpd daemon failure prevents normal SNMP operations from functioning. This creates a significant challenge for network operations teams who depend on SNMP for device status monitoring, configuration management, and performance tracking. The sustained nature of the denial of service means that once exploited, the affected device requires manual intervention for recovery, potentially causing extended outages that impact business operations. The vulnerability's presence across multiple Junos OS versions indicates a persistent flaw in the software's memory management implementation that spans several release cycles.
Mitigation strategies for CVE-2022-22177 must prioritize immediate software updates to patched versions of Junos OS and Junos OS Evolved. Organizations should implement comprehensive patch management procedures to ensure all affected devices receive the necessary security updates. Network segmentation and access control measures can help limit the potential impact by restricting SNMP access to trusted management stations only. Monitoring systems should be enhanced to detect abnormal snmpd daemon behavior or frequent restart patterns that may indicate exploitation attempts. The vulnerability's characteristics align with ATT&CK technique T1499.004: Endpoint Denial of Service, specifically targeting network infrastructure devices through service disruption mechanisms. Additionally, implementing network-based intrusion detection systems that monitor for anomalous SNMP traffic patterns can help identify potential exploitation attempts before they cause service disruption. Organizations should also consider implementing redundant monitoring solutions that can operate independently of the snmpd daemon to maintain operational visibility during potential exploitation events.