CVE-2018-21201 Explained : Impact and Mitigation
Learn about CVE-2018-21201, a critical vulnerability in NETGEAR devices allowing authenticated users to trigger a stack-based buffer overflow. Find mitigation steps and update recommendations here.
Certain NETGEAR devices, including D6100, R6100, R7800, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, and WNR2000v5, are vulnerable to a stack-based buffer overflow when accessed by an authenticated user.
Understanding CVE-2018-21201
This CVE identifies a critical vulnerability in various NETGEAR devices that could be exploited by an authenticated user.
What is CVE-2018-21201?
The CVE-2018-21201 vulnerability involves a stack-based buffer overflow in specific NETGEAR routers and gateways, allowing an authenticated user to potentially execute arbitrary code or disrupt the device's operation.
The Impact of CVE-2018-21201
The vulnerability has a CVSS base score of 6.8, indicating a medium severity issue with high impacts on confidentiality, integrity, and availability of the affected devices.
Technical Details of CVE-2018-21201
This section delves into the technical aspects of the CVE.
Vulnerability Description
The vulnerability arises due to a stack-based buffer overflow in certain NETGEAR devices, enabling an authenticated user to trigger the exploit.
Affected Systems and Versions
- Devices affected include D6100, R6100, R7800, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, and WNR2000v5.
- Vulnerable versions: D6100 before 1.0.0.57, R6100 before 1.0.1.20, R7800 before 1.0.2.40, R9000 before 1.0.2.52, WNDR3700v4 before 1.0.2.92, WNDR4300 before 1.0.2.94, WNDR4300v2 before 1.0.0.50, WNDR4500v3 before 1.0.0.50, and WNR2000v5 before 1.0.0.62.
Exploitation Mechanism
- Attack Complexity: Low
- Attack Vector: Adjacent Network
- Privileges Required: High
- User Interaction: None
- Scope: Unchanged
- Vector String: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N
Mitigation and Prevention
Protecting systems from CVE-2018-21201 is crucial to maintaining security.
Immediate Steps to Take
- Update affected devices to the latest firmware versions provided by NETGEAR.
- Implement strong, unique passwords for device access.
- Restrict network access to authorized users only.
Long-Term Security Practices
- Regularly monitor for security advisories and updates from NETGEAR.
- Conduct periodic security assessments and audits of network devices.
- Train users on best security practices to prevent unauthorized access.
Patching and Updates
- Apply patches and firmware updates promptly to address known vulnerabilities and enhance device security.