CVE-2019-20692 in D6400
Summary
by MITRE
Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects D6220 before 1.0.0.44, D6400 before 1.0.0.78, D7000v2 before 1.0.0.51, D8500 before 1.0.3.42, DGN2200v4 before 1.0.0.110, DGND2200Bv4 before 1.0.0.109, EX3700 before 1.0.0.70, EX3800 before 1.0.0.70, EX6000 before 1.0.0.30, EX6100 before 1.0.2.24, EX6120 before 1.0.0.40, EX6130 before 1.0.0.22, EX6150v1 before 1.0.0.42, EX6200 before 1.0.3.88, EX7000 before 1.0.0.66, R6250 before 1.0.4.26, R6300v2 before 1.0.4.28, R6400 before 1.0.1.36, R6400v2 before 1.0.2.52, R6700 before 1.0.1.46, R6900 before 1.0.1.46, R7000 before 1.0.9.28, R6900P before 1.3.1.44, R7000P before 1.3.1.44, R7100LG before 1.0.0.46, R7300DST before 1.0.0.68, R7900 before 1.0.2.10, R8000 before 1.0.4.12, R7900P before 1.3.0.10, R8000P before 1.3.0.10, R8300 before 1.0.2.122, R8500 before 1.0.2.122, WN2500RPv2 before 1.0.1.54, WNDR3400v3 before 1.0.1.22, and WNR3500Lv2 before 1.2.0.54.
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Analysis
by VulDB Data Team • 05/27/2024
This vulnerability represents a critical stack-based buffer overflow condition that affects numerous NETGEAR wireless routers and networking devices, creating a significant security risk for affected deployments. The flaw exists within the device's firmware implementation and can be exploited by unauthenticated attackers who do not require any prior access credentials or network privileges to initiate the attack. According to the vulnerability description, multiple device models across various NETGEAR product lines are impacted, including popular router series such as the D6220, D6400, D7000v2, and D8500, among many others. The affected firmware versions span a wide range of releases, indicating this vulnerability has been present for an extended period and affects both older and relatively newer device iterations. The buffer overflow occurs when the device processes incoming network traffic or specific HTTP requests, allowing an attacker to overwrite adjacent memory locations on the device's stack. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions, and represents a classic example of memory safety issues that can lead to arbitrary code execution.
The operational impact of this vulnerability extends beyond simple network disruption, as successful exploitation could enable attackers to gain full control over affected devices, potentially allowing them to modify network configurations, intercept traffic, or establish persistent backdoors within the network infrastructure. Attackers could leverage this vulnerability to perform man-in-the-middle attacks, redirect traffic through malicious servers, or use the compromised devices as launching points for further attacks against internal network resources. The unauthenticated nature of the attack means that any individual with access to the network can exploit this vulnerability without requiring legitimate credentials, making it particularly dangerous for enterprise and home network deployments. Devices that are continuously connected to the internet and exposed to external traffic are at the highest risk, as they provide attackers with continuous opportunities to attempt exploitation. The vulnerability's presence in multiple device models also suggests that attackers could target specific network segments by identifying and exploiting devices with vulnerable firmware versions.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from NETGEAR, as the company has released patched versions addressing this specific buffer overflow condition. Network administrators should prioritize updating all affected devices regardless of their location within the network infrastructure, as even devices that are not directly exposed to external traffic may be vulnerable if they are connected to networks that are compromised. Organizations should also implement network segmentation and access control measures to limit the potential impact of a successful exploitation, including restricting external access to internal network devices and monitoring for unusual traffic patterns that might indicate exploitation attempts. The vulnerability aligns with several tactics described in the ATT&CK framework under the initial access and execution phases, where attackers can leverage unauthenticated remote code execution capabilities to establish persistent access to network infrastructure. Additional defensive measures include implementing network intrusion detection systems that can identify malformed packets targeting known buffer overflow patterns, as well as conducting regular vulnerability assessments to identify any remaining unpatched devices within the network environment. Given the widespread nature of the affected device models, comprehensive inventory management and patch deployment processes should be implemented to ensure all vulnerable network equipment receives timely updates and remediation.