Source: vulnreport@tenable.com
Netgear Nighthawk R6700 version 1.0.4.120 does not utilize secure communication methods to the web interface. By default, all communication to/from the device's web interface is sent via HTTP, which causes potentially sensitive information (such as usernames and passwords) to be transmitted in cleartext.
Netgear Nighthawk R6700 routers running firmware version 1.0.4.120 are vulnerable to a critical security flaw. This vulnerability allows attackers to intercept sensitive credentials transmitted in cleartext over HTTP, potentially leading to complete device compromise and network access. Exploitation is straightforward, making this a high-priority risk.
Step 1: Network Positioning: The attacker must be on the same network as the vulnerable Netgear router or be able to intercept network traffic (e.g., via a compromised device or a man-in-the-middle attack).
Step 2: Traffic Interception: The attacker uses a network sniffer (e.g., Wireshark, tcpdump) to capture HTTP traffic to and from the router's web interface.
Step 3: Credential Harvesting: The attacker analyzes the captured HTTP traffic, identifying and extracting the cleartext usernames and passwords used to access the router's web interface.
Step 4: Device Compromise: Armed with the stolen credentials, the attacker can log into the router's web interface, gaining full control over the device. This allows for modification of network settings, access to connected devices, and potential pivoting to other systems on the network.
The root cause of CVE-2021-20174 is the lack of secure communication (HTTPS) for the web interface of the Netgear Nighthawk R6700. The device defaults to using HTTP, meaning all data exchanged between the user's web browser and the router, including usernames, passwords, and potentially other configuration data, is transmitted in cleartext. This allows an attacker on the same network (or positioned in a man-in-the-middle position) to easily capture this traffic using tools like Wireshark or tcpdump. The flaw isn't a specific code vulnerability like a buffer overflow or SQL injection, but rather a design flaw that prioritizes ease of access over security. The lack of HTTPS is the fundamental weakness, enabling trivial credential theft.
While no specific APTs are directly linked to exploiting this specific CVE, the ease of exploitation makes it attractive to a wide range of threat actors, including those seeking initial access. This vulnerability could be used as a stepping stone for more sophisticated attacks. CISA KEV status: Not Listed
Network traffic analysis: Monitor network traffic for HTTP communication to the router's IP address, especially on port 80. Look for POST requests containing login credentials.
IDS/IPS signatures: Implement signatures to detect cleartext credential transmission over HTTP to the router's IP address.
Log analysis: Review router logs for suspicious login attempts or configuration changes.
Forensic analysis: Examine network traffic captures (PCAP files) for HTTP traffic containing usernames and passwords.
Endpoint Detection and Response (EDR): Monitor devices connected to the network for unusual network activity or attempts to access the router's web interface.
Upgrade Firmware: Upgrade the Netgear Nighthawk R6700 firmware to a version that supports and enforces HTTPS for the web interface. Ensure the latest firmware is installed.
Disable HTTP Access: If possible, disable HTTP access to the router's web interface entirely. If HTTP access is required, consider using a strong password and enabling HTTPS.
Strong Passwords: Enforce the use of strong, unique passwords for the router's web interface and all connected devices.
Network Segmentation: Segment the network to limit the impact of a compromised router. Place critical devices on a separate VLAN.
Regular Security Audits: Conduct regular security audits and penetration testing to identify and address vulnerabilities.
Monitor Network Traffic: Implement network monitoring to detect and alert on suspicious activity, including cleartext credential transmission.