CVE-2019-15804

EUVD-2019-6723
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. By sending a signal to the CLI process, undocumented functionality is triggered. Specifically, a menu can be triggered by sending the SIGQUIT signal to the CLI application (e.g., through CTRL+\ via SSH). The access control check for this menu does work and prohibits accessing the menu, which contains "Password recovery for specific user" options. The menu is believed to be accessible using a serial console.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 47%
Affected Products (NVD)
VendorProductVersion
zyxelgs1900-8_firmware
𝑥
< 2.50\(aahh.0\)c0
zyxelgs1900-8hp_firmware
𝑥
< 2.50\(aahi.0\)c0
zyxelgs1900-10hp_firmware
𝑥
< 2.50\(aazi.0\)c0
zyxelgs1900-16_firmware
𝑥
< 2.50\(aahj.0\)c0
zyxelgs1900-24e_firmware
𝑥
< 2.50\(aahk.0\)c0
zyxelgs1900-24_firmware
𝑥
< 2.50\(aahl.0\)c0
zyxelgs1900-24hp_firmware
𝑥
< 2.50\(aahm.0\)c0
zyxelgs1900-48_firmware
𝑥
< 2.50\(aahn.0\)c0
zyxelgs1900-48hp_firmware
𝑥
< 2.50\(aaho.0\)c0
𝑥
= Vulnerable software versions
References
https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html
https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml
https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html
https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml