CVE-2022-22154 in Junos OS
Summary
by MITRE • 01/19/2022
In a Junos Fusion scenario an External Control of Critical State Data vulnerability in the Satellite Device (SD) control state machine of Juniper Networks Junos OS allows an attacker who is able to make physical changes to the cabling of the device to cause a denial of service (DoS). An SD can get rebooted and subsequently controlled by an Aggregation Device (AD) which does not belong to the original Fusion setup and is just connected to an extended port of the SD. To carry out this attack the attacker needs to have physical access to the cabling between the SD and the original AD. This issue affects: Juniper Networks Junos OS 16.1R1 and later versions prior to 18.4R3-S10; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R3-S4. This issue does not affect Juniper Networks Junos OS versions prior to 16.1R1.
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Analysis
by VulDB Data Team • 01/20/2022
The vulnerability CVE-2022-22154 represents a critical weakness in Juniper Networks Junos OS that specifically impacts Fusion networking deployments where external control of critical state data can be achieved through physical manipulation of cabling connections. This issue manifests within the Satellite Device (SD) control state machine, creating a pathway for unauthorized network disruption that fundamentally compromises the integrity of Fusion configurations. The vulnerability is classified under CWE-284, which addresses "Improper Access Control" in network device management systems, and aligns with ATT&CK technique T1499.004 for "Network Denial of Service" through physical access manipulation. The attack vector requires physical access to the cabling infrastructure between the Satellite Device and its original Aggregation Device, making this a particularly concerning threat in environments where physical security controls may be insufficient.
The technical flaw stems from inadequate validation mechanisms within the SD control state machine that governs how Satellite Devices respond to connection changes in Fusion setups. When an attacker physically alters the cabling connections, specifically by connecting an SD to an extended port of another Aggregation Device that was not part of the original Fusion configuration, the system fails to properly authenticate or validate the new connection parameters. This allows the attacker's Aggregation Device to assume control over the Satellite Device, effectively hijacking the network device's operational state and potentially enabling further malicious activities. The vulnerability exists because the system lacks robust state validation protocols that would normally prevent unauthorized devices from assuming control of network infrastructure components. This weakness directly violates the principle of least privilege in network device management, where only authorized aggregation devices should be permitted to control satellite components.
The operational impact of this vulnerability extends beyond simple denial of service conditions, creating potential for broader network compromise and unauthorized access to critical infrastructure components. When an SD becomes controlled by an unauthorized AD, the attacker gains the ability to manipulate network traffic flows, potentially redirecting communications or creating man-in-the-middle scenarios. This disruption can cascade through the entire Fusion network, affecting multiple connected devices and potentially compromising sensitive network operations. The vulnerability affects multiple Junos OS versions including 16.1R1 and later up to 18.4R3-S10, 19.1R3-S7, and 19.2R3-S4, indicating a prolonged period during which organizations were exposed to this threat. The severity is compounded by the fact that physical access requirements may be achievable in environments where security perimeters are not adequately protected, particularly in data centers or network operations centers where cabling access points are not properly secured.
Organizations affected by this vulnerability should immediately implement comprehensive network security measures that include physical access controls, regular network topology audits, and enhanced monitoring of cabling connections within Fusion deployments. Network administrators should consider implementing additional authentication mechanisms beyond what is provided by default in Junos OS, particularly for devices that are part of Fusion configurations. The recommended mitigations include upgrading to patched versions of Junos OS, implementing network segmentation to isolate Fusion components, and establishing strict physical security protocols around cabling infrastructure. Security teams should also deploy continuous monitoring solutions that can detect unauthorized cabling changes and alert administrators to potential compromise scenarios. This vulnerability highlights the critical importance of maintaining up-to-date security patches and the necessity of robust physical security controls in network infrastructure management, particularly for mission-critical systems where unauthorized access could lead to significant operational disruption or data compromise.