CVE-2019-15804

Public Exploit

Description

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.24%

Vendor Advisory zyxel.com

Affected: n/a n/a

References

Link	Tags
https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html	third party advisory exploit
https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-15804?: CVE-2019-15804 has been scored as a high severity vulnerability.
How to fix CVE-2019-15804?: To fix CVE-2019-15804, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-15804 being actively exploited in the wild?: It is possible that CVE-2019-15804 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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