CVE-2022-36556 in SkyBridge MB-A100
Summary
by MITRE • 08/30/2022
Seiko SkyBridge MB-A100/A110 v4.2.0 and below was discovered to contain a command injection vulnerability via the ipAddress parameter at 07system08execute_ping_01.
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Analysis
by VulDB Data Team • 10/10/2022
The vulnerability identified as CVE-2022-36556 affects Seiko SkyBridge MB-A100 and MB-A110 network devices running firmware versions v4.2.0 and earlier. This critical security flaw resides within the system's command execution functionality, specifically in the ipAddress parameter handling during the ping execution process. The affected device operates as a network bridge system that manages connectivity between different network segments, making it a potential target for attackers seeking to compromise network infrastructure. The vulnerability stems from inadequate input validation and sanitization within the device's web interface, allowing malicious actors to inject arbitrary commands that execute with the privileges of the web server process. This type of vulnerability falls under CWE-77 and CWE-94 categories, representing command injection and code injection weaknesses respectively, which are fundamental security flaws that enable attackers to execute unauthorized code on the target system.
The operational impact of this vulnerability extends beyond simple command execution, as it provides attackers with the capability to gain persistent access to the network infrastructure. When an attacker successfully exploits this vulnerability, they can execute arbitrary commands on the device, potentially leading to complete system compromise, data exfiltration, or disruption of network services. The vulnerability is particularly concerning because it affects network bridge devices that often serve as critical components in industrial control systems, enterprise networks, and IoT deployments where network segmentation and security are paramount. Attackers could leverage this weakness to establish backdoors, modify network configurations, or use the compromised device as a pivot point to attack other systems within the network. The attack vector is relatively straightforward, requiring only a crafted payload in the ipAddress parameter during ping execution, which makes exploitation accessible to attackers with moderate technical skills.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly under the T1059.001 technique for command and scripting interpreter, and T1021.001 for remote services. The vulnerability enables attackers to perform lateral movement and privilege escalation within network environments where these devices are deployed. Organizations should implement immediate mitigations including firmware updates to versions that address the command injection flaw, network segmentation to isolate affected devices, and monitoring for suspicious ping command executions. Additionally, input validation should be enforced at multiple layers including web application firewalls, network access controls, and device configuration hardening. The vulnerability highlights the importance of secure coding practices and proper input sanitization in embedded systems, particularly those handling network operations. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other network infrastructure components, as the attack surface for such devices continues to expand with increasing network connectivity and IoT adoption.