CVE-2022-26992 in SBR-AC1900P
Summary
by MITRE • 03/16/2022
Arris routers SBR-AC1900P 1.0.7-B05, SBR-AC3200P 1.0.7-B05 and SBR-AC1200P 1.0.5-B05 were discovered to contain a command injection vulnerability in the ddns function via the DdnsUserName, DdnsHostName, and DdnsPassword parameters. This vulnerability allows attackers to execute arbitrary commands via a crafted request.
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Analysis
by VulDB Data Team • 03/18/2022
The CVE-2022-26992 vulnerability represents a critical command injection flaw discovered in Arris residential gateway routers including the SBR-AC1900P, SBR-AC3200P, and SBR-AC1200P models. This vulnerability specifically affects the dynamic domain name system ddns function within these networking devices, creating a significant security risk for users who rely on these routers for their home or small office networks. The flaw exists in the handling of three specific parameters: DdnsUserName, DdnsHostName, and DdnsPassword, which are processed without adequate input validation or sanitization.
The technical exploitation of this vulnerability occurs through the manipulation of the ddns function parameters, allowing attackers to inject malicious commands that are then executed by the router's underlying operating system. This command injection flaw stems from improper input sanitization where user-supplied data is directly incorporated into system commands without proper escaping or validation mechanisms. The vulnerability falls under CWE-77 which specifically addresses command injection flaws, and aligns with ATT&CK technique T1059.001 for command and scripting interpreter. When exploited, the vulnerability enables remote code execution on the affected devices, potentially allowing attackers to gain full administrative control over the router's functions.
The operational impact of this vulnerability extends beyond simple network disruption, as it provides attackers with persistent access to the network infrastructure. Once compromised, attackers can manipulate network traffic, redirect DNS queries, modify router configurations, and potentially use the device as a pivot point for attacking other systems within the local network. The affected router models are commonly deployed in residential and small business environments where network security may be insufficient, making them attractive targets for exploitation. This vulnerability particularly affects the security posture of organizations that have not updated their firmware or implemented network segmentation to isolate these devices from critical systems.
Mitigation strategies for CVE-2022-26992 should prioritize immediate firmware updates from Arris, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should also implement network segmentation to isolate affected devices from critical infrastructure and monitor for suspicious network activity that might indicate exploitation attempts. Additional protective measures include disabling unnecessary services, implementing strong authentication mechanisms, and conducting regular vulnerability assessments of network equipment. The vulnerability demonstrates the importance of secure coding practices in embedded systems and highlights the need for manufacturers to implement proper input validation and sanitization techniques. Organizations should also consider deploying intrusion detection systems to monitor for exploitation attempts and maintain comprehensive network monitoring to detect unauthorized access to network devices.