CVE-2024-31817 Overview
CVE-2024-31817 is an information disclosure vulnerability in the TOTOLINK EX200 wireless range extender running firmware version V4.0.3c.7646_B20201211. The flaw resides in the getSysStatusCfg function, which exposes sensitive system status information without requiring authentication. Remote attackers can query this function over the network to retrieve configuration data intended to be restricted. The issue is classified under [CWE-200] (Exposure of Sensitive Information to an Unauthorized Actor). TOTOLINK EX200 devices are commonly deployed in small office and home environments, expanding the potential attack surface.
Critical Impact
Unauthenticated remote attackers can extract sensitive system configuration data from affected TOTOLINK EX200 devices through the getSysStatusCfg endpoint.
Affected Products
- TOTOLINK EX200 hardware (all units running the affected firmware)
- TOTOLINK EX200 firmware version 4.0.3c.7646_B20201211
- Deployments exposing the device management interface to untrusted networks
Discovery Timeline
- 2024-04-08 - CVE-2024-31817 published to NVD
- 2025-03-24 - Last updated in NVD database
Technical Details for CVE-2024-31817
Vulnerability Analysis
The vulnerability stems from the getSysStatusCfg function in the TOTOLINK EX200 web management interface. This function returns system status and configuration parameters when invoked, but the device fails to enforce authentication or authorization before processing the request. An attacker on the same network segment, or any attacker with network reachability to the device management interface, can invoke the function directly. The response discloses device configuration details that should remain restricted to administrators. Exposed data of this nature commonly aids reconnaissance and chained attacks against the device or connected hosts.
Root Cause
The root cause is missing access control on the getSysStatusCfg request handler. The firmware processes the request and returns sensitive data without validating that the caller holds an authenticated session. This is a classic [CWE-200] information exposure pattern in embedded web management interfaces.
Attack Vector
Exploitation requires only network access to the device's HTTP management interface. The attacker sends a crafted request invoking getSysStatusCfg and parses the response. No user interaction, credentials, or privileges are required. Public proof-of-concept details are documented in the GitHub PoC for CVE-2024-31817. The EPSS score of 8.174% places this CVE in the 92nd percentile for exploitation likelihood.
Detection Methods for CVE-2024-31817
Indicators of Compromise
- Unexpected HTTP requests to the TOTOLINK EX200 management interface referencing the getSysStatusCfg function name
- Outbound responses from EX200 devices containing system configuration fields to unfamiliar source IP addresses
- Repeated unauthenticated requests to the device CGI endpoints from a single external host
Detection Strategies
- Inspect HTTP logs on perimeter devices for query strings or POST bodies containing getSysStatusCfg
- Baseline normal management traffic to the EX200 and alert on requests originating from non-administrative hosts
- Capture device traffic with a network sensor and flag responses disclosing model, firmware, or network configuration to external callers
Monitoring Recommendations
- Forward router and switch flow logs to a centralized analytics platform for correlation against the EX200's management IP
- Monitor for scanning patterns targeting TOTOLINK-specific CGI paths across the network
- Alert on any direct internet exposure of the EX200 web interface using external attack surface monitoring
How to Mitigate CVE-2024-31817
Immediate Actions Required
- Restrict access to the EX200 management interface to a dedicated administrative VLAN or trusted IP allowlist
- Block inbound WAN access to the device's HTTP and HTTPS management ports at the upstream firewall
- Audit deployed EX200 units and identify any running firmware V4.0.3c.7646_B20201211
Patch Information
No vendor advisory or fixed firmware version is listed in the NVD record for CVE-2024-31817. Administrators should monitor the TOTOLINK support site for firmware updates addressing the getSysStatusCfg access control issue. Until a patch is available, treat affected devices as exposed and apply network-level compensating controls.
Workarounds
- Place EX200 devices behind a firewall that denies all unsolicited inbound traffic to management ports
- Disable remote management features and limit administration to wired LAN connections
- Replace end-of-support TOTOLINK EX200 units with actively maintained extenders where firmware fixes are not forthcoming
# Configuration example: block external access to the EX200 management interface
# Replace 192.0.2.10 with the EX200 LAN IP and 10.0.0.0/24 with the admin subnet
iptables -A FORWARD -d 192.0.2.10 -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A FORWARD -d 192.0.2.10 -p tcp --dport 80 -j DROP
iptables -A FORWARD -d 192.0.2.10 -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A FORWARD -d 192.0.2.10 -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
