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Port 59777 – ADB-ALT (Android Debug)

Service:

adb-alt

Protocol:

TCP

Port:

59777

Used for:

Android Debug Bridge alternative port

Why It’s Open

Port 59777 is primarily used as an alternative Android Debug Bridge (ADB) port. While the standard ADB port is 5555, some Android-based devices, particularly smart TVs, IoT devices, and certain mobile applications use port 59777 for debugging and development purposes. This port is also used by various file sharing applications like MiDrop on Xiaomi devices for device-to-device communication.

Common Risks

  • Unauthorized device access
    Open debugging ports allow attackers to connect to Android devices remotely.
  • Command execution
    ADB interfaces provide shell access that can be leveraged to run malicious commands.
  • Data extraction
    Debug bridges enable the exfiltration of sensitive user data and application information.
  • Malware installation
    Attackers can use ADB to silently install malicious applications without user consent.
  • Device manipulation
    Open debugging interfaces allow configuration changes and security setting modifications.

Enumeration & Testing

Service Detection:

Terminal window
nmap -sV -p 59777

ADB Connection Testing:

Terminal window
adb connect :59777 adb devices

Android Device Information:

Terminal window
adb -s :59777 shell getprop adb -s :59777 shell id

What to Look For

CheckpointWhat it means
Service versionIdentify software version and patch level
AuthenticationCheck for default or weak credentials
SSL/TLS configVerify encryption settings if applicable
Access controlsTest for proper authorization mechanisms

Mitigation

  • Keep software updated
    Apply latest security patches
  • Strong authentication
    Use complex passwords and 2FA
  • Access restrictions
    Limit service to trusted networks
  • Monitor activity
    Log and review service usage
  • Disable if unused
    Remove unnecessary services

TL;DR

  • Port 59777 = Android Debug Bridge alternative with mobile debugging risks
  • Protocol: TCP
  • Used for: Android device debugging and mobile app development
  • Security focus: Mobile device security and debugging interface protection

Known CVEs and Exploits

  • CVE-2023-20917 - Android ADB elevation of privilege vulnerability allowing root access via debug interfaces.
  • CVE-2021-0397 - ADB unauthorized access vulnerability bypassing authentication on some OEM implementations.
  • CVE-2020-0022 - Android Bluetooth RCE vulnerability chainable with exposed ADB interfaces.