CVE-2019-15804 Security feature bypass in n/a
Attackers can bypass access controls to reach a hidden password recovery menu on Zyxel switches by sending a specific signal to the CLI process.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-15804?
CVE-2019-15804 is a high-severity vulnerability in n/a, published on 14 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2019-15804?
It affects 9 products.
Products include Zyxel Gs1900-10hp Firmware, Zyxel Gs1900-16 Firmware, Zyxel Gs1900-24 Firmware, Zyxel Gs1900-24e Firmware, Zyxel Gs1900-24hp Firmware, Zyxel Gs1900-48 Firmware and 3 more.
How do I fix CVE-2019-15804?
No fix has been published for CVE-2019-15804 yet. Limit exposure of the affected software until one is available.
Is CVE-2019-15804 being exploited?
There is no known exploitation of CVE-2019-15804 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-f7fc-w7v7-g3q3.