CVE-2022-26380 in SCALANCE X302-7 EEC
Summary
by MITRE • 04/12/2022
A vulnerability has been identified in SCALANCE X302-7 EEC (230V), SCALANCE X302-7 EEC (230V, coated), SCALANCE X302-7 EEC (24V), SCALANCE X302-7 EEC (24V, coated), SCALANCE X302-7 EEC (2x 230V), SCALANCE X302-7 EEC (2x 230V, coated), SCALANCE X302-7 EEC (2x 24V), SCALANCE X302-7 EEC (2x 24V, coated), SCALANCE X304-2FE, SCALANCE X306-1LD FE, SCALANCE X307-2 EEC (230V), SCALANCE X307-2 EEC (230V, coated), SCALANCE X307-2 EEC (24V), SCALANCE X307-2 EEC (24V, coated), SCALANCE X307-2 EEC (2x 230V), SCALANCE X307-2 EEC (2x 230V, coated), SCALANCE X307-2 EEC (2x 24V), SCALANCE X307-2 EEC (2x 24V, coated), SCALANCE X307-3, SCALANCE X307-3, SCALANCE X307-3LD, SCALANCE X307-3LD, SCALANCE X308-2, SCALANCE X308-2, SCALANCE X308-2LD, SCALANCE X308-2LD, SCALANCE X308-2LH, SCALANCE X308-2LH, SCALANCE X308-2LH+, SCALANCE X308-2LH+, SCALANCE X308-2M, SCALANCE X308-2M, SCALANCE X308-2M PoE, SCALANCE X308-2M PoE, SCALANCE X308-2M TS, SCALANCE X308-2M TS, SCALANCE X310, SCALANCE X310, SCALANCE X310FE, SCALANCE X310FE, SCALANCE X320-1 FE, SCALANCE X320-1-2LD FE, SCALANCE X408-2, SCALANCE XR324-12M (230V, ports on front), SCALANCE XR324-12M (230V, ports on front), SCALANCE XR324-12M (230V, ports on rear), SCALANCE XR324-12M (230V, ports on rear), SCALANCE XR324-12M (24V, ports on front), SCALANCE XR324-12M (24V, ports on front), SCALANCE XR324-12M (24V, ports on rear), SCALANCE XR324-12M (24V, ports on rear), SCALANCE XR324-12M TS (24V), SCALANCE XR324-12M TS (24V), SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on front), SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on front), SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on rear), SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on rear), SCALANCE XR324-4M EEC (24V, ports on front), SCALANCE XR324-4M EEC (24V, ports on front), SCALANCE XR324-4M EEC (24V, ports on rear), SCALANCE XR324-4M EEC (24V, ports on rear), SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on front), SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on front), SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on rear), SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on rear), SCALANCE XR324-4M EEC (2x 24V, ports on front), SCALANCE XR324-4M EEC (2x 24V, ports on front), SCALANCE XR324-4M EEC (2x 24V, ports on rear), SCALANCE XR324-4M EEC (2x 24V, ports on rear), SCALANCE XR324-4M PoE (230V, ports on front), SCALANCE XR324-4M PoE (230V, ports on rear), SCALANCE XR324-4M PoE (24V, ports on front), SCALANCE XR324-4M PoE (24V, ports on rear), SCALANCE XR324-4M PoE TS (24V, ports on front), SIPLUS NET SCALANCE X308-2. Affected devices do not properly validate if a certain SNMP key exists. An attacker could use this to trigger a reboot of an affected device by requesting specific SNMP information from the device.
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Analysis
by VulDB Data Team • 04/14/2022
This vulnerability exists within various industrial network switches manufactured by Siemens, specifically affecting models including SCALANCE X302-7 EEC, SCALANCE X304-2FE, SCALANCE X306-1LD FE, and numerous others. The flaw resides in the Simple Network Management Protocol implementation where the device fails to properly validate the existence of specific SNMP keys during information requests. This validation failure creates an exploitable condition that allows remote attackers to manipulate the device's operational state through crafted SNMP queries. The vulnerability is categorized under CWE-20 as "Improper Input Validation" and represents a critical weakness in the network device's security architecture. According to ATT&CK framework, this issue maps to T1210 - "Exploitation of Remote Services" and T1498 - "Network Denial of Service," as it enables attackers to disrupt network operations through device reboots. The affected devices operate in industrial control systems and critical infrastructure environments where network availability is paramount for operational continuity.
The technical mechanism of exploitation involves sending specially crafted SNMP GET requests that target non-existent or improperly validated SNMP keys within the device's management interface. When the device processes these requests without proper validation, it triggers an internal error condition that results in an automatic system reboot. This behavior demonstrates a lack of proper error handling and input sanitization within the SNMP service implementation. The vulnerability is particularly concerning because it does not require authentication for exploitation, making it accessible to any remote attacker who can reach the device's network management port. The reboot operation effectively creates a denial of service condition that can disrupt critical industrial processes, potentially leading to production halts or safety system failures in environments where these switches are deployed.
The operational impact of this vulnerability extends beyond simple service disruption, particularly in industrial environments where network reliability directly correlates with operational safety and productivity. When affected switches reboot, they can cause network partitions, communication failures between critical control systems, and potential loss of monitoring capabilities that industrial operators rely upon for process control. The vulnerability affects a broad range of Siemens industrial switches that are commonly deployed in manufacturing, energy, and process control environments, making it a significant concern for organizations maintaining industrial control systems. Network administrators may experience unexpected downtime during critical production periods, while security teams must consider the potential for this vulnerability to be leveraged as part of broader attack campaigns targeting industrial infrastructure. The impact is amplified when considering that many of these devices operate in environments where physical access is limited, making remote exploitation particularly dangerous.
Mitigation strategies should focus on immediate network segmentation and access control measures to limit exposure of affected devices to untrusted networks. Organizations should implement network access controls that restrict SNMP traffic to authorized management stations only, and consider disabling SNMPv1 and SNMPv2c if SNMPv3 is available as a more secure alternative. Device firmware updates from Siemens should be applied immediately upon availability, as these patches typically address the improper input validation issue by implementing proper key existence checks. Network monitoring should be enhanced to detect unusual reboot patterns or unauthorized SNMP access attempts that could indicate exploitation attempts. Additionally, implementing network intrusion detection systems with signatures specific to this vulnerability can help identify potential attacks before they succeed in causing device reboots. Regular vulnerability assessments should be conducted to identify other unpatched devices within the industrial network infrastructure, and security policies should be updated to require secure SNMP configuration practices across all networked industrial equipment.