CVE-2024-8078: Totolink T8 Buffer Overflow Vulnerability

CVE-2024-8078 Overview

CVE-2024-8078 is a buffer overflow vulnerability in the TOTOLINK AC1200 T8 router running firmware version 4.1.5cu.862_B20230228. The flaw resides in the setTracerouteCfg function, where unchecked input handling allows attackers to overwrite adjacent memory regions. Remote attackers can trigger the overflow over the network, potentially achieving arbitrary code execution on the affected device. The vendor was contacted prior to disclosure but did not respond, leaving devices exposed without an official patch. The vulnerability is classified under CWE-120, Buffer Copy without Checking Size of Input.

Critical Impact

Remote attackers with low privileges can exploit the setTracerouteCfg buffer overflow to compromise confidentiality, integrity, and availability of the TOTOLINK T8 router.

Affected Products

• TOTOLINK AC1200 T8 router (hardware)
• TOTOLINK T8 firmware version 4.1.5cu.862_B20230228
• Deployments exposing the router management interface to untrusted networks

Discovery Timeline

• 2024-08-22 - CVE-2024-8078 published to NVD
• 2024-12-13 - Last updated in NVD database

Technical Details for CVE-2024-8078

Vulnerability Analysis

The vulnerability resides in the setTracerouteCfg function exposed by the TOTOLINK T8 web management interface. The function processes traceroute configuration parameters submitted by authenticated users. Input length is not validated before being copied into a fixed-size stack buffer, producing a classic stack buffer overflow condition. An attacker who reaches the management endpoint over the network can send a crafted request containing oversized parameter values. The resulting overflow corrupts adjacent stack memory, including the saved return address, and enables control-flow hijacking on the MIPS-based device. Public technical analysis is available in the hawkteam404 RnD repository.

Root Cause

The root cause is the absence of bounds checking on user-supplied input passed to setTracerouteCfg. The handler copies request parameters directly into a stack buffer without validating length against the destination size. This pattern matches [CWE-120], where untrusted input length exceeds the target buffer capacity.

Attack Vector

The attack vector is network-based and requires low privileges on the device. Attackers send a crafted HTTP request to the router's web management interface targeting the traceroute configuration endpoint. No user interaction is required. Exposed administrative interfaces, reused default credentials, or compromised LAN access make this vulnerability practical to weaponize. See the VulDB entry #275560 for additional context.

Detection Methods for CVE-2024-8078

Indicators of Compromise

• Unexpected HTTP POST requests to the traceroute configuration endpoint containing oversized parameter values
• Router reboots, watchdog resets, or service crashes following management interface access
• Outbound connections from the router to unknown hosts indicating post-exploitation activity
• New or modified firewall rules and DNS settings on the device without administrative action

Detection Strategies

• Inspect web server and management daemon logs for malformed requests to setTracerouteCfg
• Deploy network IDS signatures that flag HTTP requests with abnormally long traceroute parameters directed at TOTOLINK management ports
• Baseline router CPU, memory, and process behavior to surface anomalies caused by exploit attempts

Monitoring Recommendations

• Forward router syslog data to a centralized SIEM and alert on repeated administrative endpoint failures
• Monitor DNS and outbound traffic from the router subnet for command-and-control patterns
• Track firmware versions and configuration drift across deployed TOTOLINK T8 devices

How to Mitigate CVE-2024-8078

Immediate Actions Required

• Restrict access to the router's web management interface to trusted management VLANs only
• Disable remote (WAN-side) administration on the TOTOLINK T8
• Rotate administrative credentials and enforce strong, unique passwords
• Segment IoT and consumer-grade devices from sensitive corporate networks

Patch Information

No vendor patch is currently available. The vendor did not respond to disclosure attempts according to the CVE record. Organizations operating the TOTOLINK AC1200 T8 on firmware 4.1.5cu.862_B20230228 should monitor the TOTOLINK official website for future firmware updates and consider replacing the device with a supported alternative if no patch is released.

Workarounds

• Place the router behind a perimeter firewall and block inbound access to management ports from untrusted networks
• Disable the traceroute configuration feature if not required for operations
• Use a VPN to reach the management interface rather than exposing it directly
• Replace end-of-support or unmaintained hardware with vendor-supported equipment

# Configuration example: restrict management interface access via upstream firewall
# Allow only the management subnet to reach the router admin port
iptables -A FORWARD -s 10.10.10.0/24 -d 192.168.1.1 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 192.168.1.1 -p tcp --dport 80 -j DROP
# Block WAN-side access to the admin interface
iptables -A INPUT -i eth0 -p tcp --dport 80 -j DROP