CVE-2026-52482 Overview
CVE-2026-52482 affects the SJRC F11 SJ-GPS-PRO drone firmware build dated 2019-09-17. The inetd service on the device spawns /app/sh_for_telnet, exposing an interactive shell interface over the network. A remote attacker can leverage this exposed service to obtain sensitive information from the device without authentication controls typical of production embedded systems.
The issue stems from an insecure default configuration in the firmware, where a debugging or maintenance shell is reachable through the network stack. This class of firmware weakness commonly leads to credential exposure, configuration disclosure, and further device compromise.
Critical Impact
Remote unauthenticated attackers within reach of the drone's network services can access an interactive shell spawned by inetd, disclosing sensitive information stored on the device.
Affected Products
- SJRC F11 SJ-GPS-PRO drone
- Firmware build 2019-09-17
- inetd service spawning /app/sh_for_telnet
Discovery Timeline
- 2026-09-09 - CVE-2026-52482 published to the National Vulnerability Database
- 2026-09-09 - Last updated in NVD database
Technical Details for CVE-2026-52482
Vulnerability Analysis
The SJRC F11 SJ-GPS-PRO firmware ships with an active inetd super-server configuration. When a client connects to the associated listener, inetd spawns the binary /app/sh_for_telnet, which provides shell-style interaction over the network. Because this handler is present in the production firmware image, it enables an information disclosure path over the network interface exposed by the drone.
This vulnerability falls into the Firmware Vulnerability and Information Exposure categories. Embedded consumer devices frequently retain manufacturer debug interfaces in shipped builds. When those interfaces bind to a network socket without authentication, any attacker able to reach the drone's Wi-Fi or IP interface can query device state and extract data.
Root Cause
The root cause is an insecure default configuration in the shipped firmware. The inetd service definition maps a network port to /app/sh_for_telnet, effectively re-enabling a telnet-style shell path. No hardening removes this handler from production images, and no credential gate protects the spawned process.
Attack Vector
An attacker within network range of the SJ-GPS-PRO connects to the drone's exposed service port. The inetd daemon accepts the connection and spawns /app/sh_for_telnet, granting the attacker interactive access to enumerate the file system, read configuration, and harvest telemetry or credentials. See the GitHub Vulnerability Report and the GitHub Security Advisory GHSA-wph3-9w93-pxxq for reproduction details.
No verified proof-of-concept code is published in the enriched data. The advisory describes the exposure of /app/sh_for_telnet through inetd rather than a memory corruption or injection primitive.
Detection Methods for CVE-2026-52482
Indicators of Compromise
- Unexpected inbound TCP connections to the drone's Wi-Fi access point on legacy telnet-style ports.
- Presence of /app/sh_for_telnet invocations in device process activity if logging is available.
- Client devices on the drone's control network initiating scans against the drone IP.
Detection Strategies
- Perform network reconnaissance against the drone's Wi-Fi network to enumerate listening services and confirm exposure of the inetd-spawned shell.
- Inspect firmware image 2019-09-17 for the inetd configuration entry mapping a service port to /app/sh_for_telnet.
- Monitor operator laptops and mobile devices for outbound connections to the drone's management subnet that are not initiated by the vendor control application.
Monitoring Recommendations
- Log all associations to the drone's Wi-Fi SSID and alert on unknown client MAC addresses.
- Capture packet traces during flight operations to identify unexpected shell-style traffic patterns.
- Track firmware versions across the fleet and flag any device still reporting the 2019-09-17 build.
How to Mitigate CVE-2026-52482
Immediate Actions Required
- Operate the SJ-GPS-PRO only in physically controlled environments where the drone's Wi-Fi range cannot be reached by untrusted parties.
- Change the default Wi-Fi credentials on the drone and use the strongest available WPA2 passphrase to limit who can associate with the device.
- Retire the device from sensitive missions until the vendor publishes a firmware update that removes the inetd-spawned shell.
Patch Information
No vendor advisory or patched firmware release is referenced in the enriched CVE data. Consult the GitHub Security Advisory GHSA-wph3-9w93-pxxq for the latest disclosure status and any coordinated vendor response.
Workarounds
- Restrict use of the drone to areas where hostile network access to the onboard Wi-Fi is not feasible.
- Isolate the operator's control device on a dedicated interface so it is not bridged to corporate or home networks.
- If shell access to the device is possible via authorized channels, remove or disable the inetd entry that spawns /app/sh_for_telnet and reboot to confirm the listener is gone.
# Configuration example: remove the telnet-style handler from inetd
# (apply only via authorized administrative access to the device)
sed -i '/sh_for_telnet/d' /etc/inetd.conf
killall -HUP inetd
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
