CVE-2019-15800 Information

Description

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Due to lack of input validation in the cmd_sys_traceroute_exec() cmd_sys_arp_clear() and cmd_sys_ping_exec() functions in the libclicmd.so library contained in the firmware an attacker could leverage these functions to call system() and execute arbitrary commands on the switches. (Note that these functions are currently not called in this version of the firmware however an attacker could use other vulnerabilities to finally use these vulnerabilities to gain code execution.)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8