CVE-2019-15799

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the same level of privileged access as administrators when connecting to the device via SSH (while their permissions via the web interface are in fact restricted). This allows normal users to obtain the administrative password by running the tech-support command via the CLI: this contains the encrypted passwords for all users on the device. As these passwords are encrypted using well-known and static parameters, they can be decrypted and the original passwords (including the administrator password) can be obtained.

• Zyxel Gs1900 10hp

  HW
  Zyxel
  all versions

• Zyxel Gs1900 10hp Firmware

  OS
  Zyxel
  < 2.50\(aazi.0\)c0

• Zyxel Gs1900 16

  HW
  Zyxel
  all versions

• Zyxel Gs1900 16 Firmware

  OS
  Zyxel
  < 2.50\(aahj.0\)c0

• Zyxel Gs1900 24

  HW
  Zyxel
  all versions

• Zyxel Gs1900 24e

  HW
  Zyxel
  all versions

• Zyxel Gs1900 24e Firmware

  OS
  Zyxel
  < 2.50\(aahk.0\)c0

• Zyxel Gs1900 24 Firmware

  OS
  Zyxel
  < 2.50\(aahl.0\)c0

• Zyxel Gs1900 24hp

  HW
  Zyxel
  all versions

• Zyxel Gs1900 24hp Firmware

  OS
  Zyxel
  < 2.50\(aahm.0\)c0

• Zyxel Gs1900 48

  HW
  Zyxel
  all versions

• Zyxel Gs1900 48 Firmware

  OS
  Zyxel
  < 2.50\(aahn.0\)c0

• Zyxel Gs1900 48hp

  HW
  Zyxel
  all versions

• Zyxel Gs1900 48hp Firmware

  OS
  Zyxel
  < 2.50\(aaho.0\)c0

• Zyxel Gs1900 8

  HW
  Zyxel
  all versions

• Zyxel Gs1900 8 Firmware

  OS
  Zyxel
  < 2.50\(aahh.0\)c0

• Zyxel Gs1900 8hp

  HW
  Zyxel
  all versions

• Zyxel Gs1900 8hp Firmware

  OS
  Zyxel
  < 2.50\(aahi.0\)c0