CVE-2021-45600 in CBR750
Summary
by MITRE • 12/26/2021
Certain NETGEAR devices are affected by command injection by an authenticated user. This affects CBR750 before 4.6.3.6, RBK852 before 3.2.17.12, RBR850 before 3.2.17.12, and RBS850 before 3.2.17.12.
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Analysis
by VulDB Data Team • 12/28/2021
The vulnerability CVE-2021-45600 represents a critical command injection flaw affecting multiple NETGEAR networking devices within the CBR750, RBK852, RBR850, and RBS850 product lines. This security weakness allows authenticated attackers to execute arbitrary commands on affected devices by leveraging improper input validation mechanisms within the device's web interface. The vulnerability specifically impacts firmware versions prior to 4.6.3.6 for CBR750 and 3.2.17.12 for the other affected models, indicating that these devices lack proper sanitization of user-supplied parameters before processing them within system commands.
The technical implementation of this vulnerability stems from inadequate validation of input parameters within the device's web administration interface. When authenticated users submit specific parameters through the web GUI, the system fails to properly sanitize these inputs before incorporating them into system command executions. This flaw falls under the Common Weakness Enumeration category CWE-77, which specifically addresses command injection vulnerabilities where attacker-controlled data is inserted into system commands. The vulnerability enables attackers to execute malicious commands with the privileges of the web server process, potentially allowing full device compromise and unauthorized access to network resources.
Operationally, this vulnerability presents significant risks to network security infrastructure as it allows authenticated users to escalate their privileges and execute arbitrary system commands on affected devices. An attacker who gains access to a valid user account can exploit this flaw to gain unauthorized access to the device's underlying operating system, potentially leading to complete device compromise. The impact extends beyond individual device compromise as these are networking devices that often serve as gateways or routers within corporate networks, making them prime targets for attackers seeking persistent access to larger network segments. The vulnerability creates opportunities for attackers to establish backdoors, modify network configurations, or use the compromised devices as launching points for further attacks within the network.
Mitigation strategies for CVE-2021-45600 primarily focus on firmware updates and network segmentation measures. Device administrators should immediately upgrade affected devices to the patched firmware versions mentioned in the CVE details, specifically targeting firmware versions 4.6.3.6 for CBR750 and 3.2.17.12 for the other affected models. Additionally, implementing network segmentation and access controls can limit the potential impact of exploitation by restricting unauthorized access to these devices. Security professionals should also consider monitoring network traffic for unusual command execution patterns and implementing intrusion detection systems to identify potential exploitation attempts. Organizations should conduct comprehensive vulnerability assessments to identify all affected devices within their network infrastructure and ensure proper access controls are enforced to prevent unauthorized authentication. The vulnerability aligns with ATT&CK technique T1059, which covers command and scripting interpreter, as it enables attackers to execute system commands through legitimate administrative interfaces.