CVE-2021-45616 in CBR750
Summary
by MITRE • 12/26/2021
Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects CBR750 before 3.2.18.2, LAX20 before 1.1.6.28, MK62 before 1.0.6.116, MR60 before 1.0.6.116, MS60 before 1.0.6.116, R6900P before 1.3.3.140, R7000 before 1.0.11.126, R7000P before 1.3.3.140, R7850 before 1.0.5.68, R7900 before 1.0.4.46, R7900P before 1.4.2.84, R7960P before 1.4.2.84, R8000 before 1.0.4.68, R8000P before 1.4.2.84, RAX15 before 1.0.3.96, RAX20 before 1.0.3.96, RAX200 before 1.0.4.120, RAX35v2 before 1.0.3.96, RAX40v2 before 1.0.3.96, RAX43 before 1.0.3.96, RAX45 before 1.0.3.96, RAX50 before 1.0.3.96, RAX75 before 1.0.4.120, RAX80 before 1.0.4.120, RBK752 before 3.2.17.12, RBK852 before 3.2.17.12, RBR750 before 3.2.17.12, RBR850 before 3.2.17.12, RBS750 before 3.2.17.12, RBS850 before 3.2.17.12, RS400 before 1.5.1.80, and XR1000 before 1.0.0.58.
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Analysis
by VulDB Data Team • 12/28/2021
This vulnerability represents a critical command injection flaw in NETGEAR networking equipment that allows unauthenticated attackers to execute arbitrary commands on affected devices. The vulnerability stems from insufficient input validation and sanitization within the device's web interface handling mechanisms, enabling attackers to inject malicious commands through crafted HTTP requests. The affected models span a broad range of NETGEAR routers and access points including popular consumer and enterprise-grade devices such as the R7900, R7900P, R8000, and various RAX series devices. The vulnerability specifically impacts firmware versions prior to the listed patches, with many models requiring updates to versions 1.0.6.116 or higher for remediation. This issue falls under the CWE-77 command injection category, which is classified as a high-severity vulnerability in the Common Weakness Enumeration catalog and represents a fundamental flaw in input processing that enables arbitrary code execution.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with complete control over affected devices without requiring authentication credentials. An attacker can leverage this vulnerability to gain unauthorized access to the device's operating system, potentially enabling them to modify network configurations, redirect traffic, install malware, or use the compromised device as a pivot point for attacks against other networked systems. The vulnerability affects devices that typically operate in residential and small business environments, making them attractive targets for cybercriminals seeking to establish persistent access points within networks. From an attacker's perspective, this vulnerability maps directly to the MITRE ATT&CK framework's T1059.001 technique for command and scripting interpreter, allowing for remote code execution and privilege escalation within the affected network segments. The unauthenticated nature of the attack means that no prior access or credentials are required, making it particularly dangerous for devices deployed in unsecured environments.
Mitigation strategies for this vulnerability require immediate firmware updates from NETGEAR to address the command injection flaw in affected device models. Network administrators should prioritize patching all identified devices, particularly those exposed to untrusted networks or public internet access. Additional security measures include implementing network segmentation to isolate affected devices, deploying intrusion detection systems to monitor for suspicious traffic patterns, and conducting thorough network assessments to identify any potential compromise. Organizations should also consider implementing network access controls and firewall rules to limit access to device management interfaces, particularly restricting access to administrative ports from untrusted networks. The vulnerability highlights the importance of secure software development practices and proper input validation, as the flaw could have been prevented through proper sanitization of user-supplied data before processing. Security teams should monitor for exploitation attempts and maintain awareness of any emerging threats targeting these specific device models, as the vulnerability creates a persistent attack surface that can be leveraged for extended network infiltration and data exfiltration activities.