CVE-2019-15804
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Zyxel Gs1900-8 Firmware
PublishedNov 14, 2019
First seenNov 14, 2019
How to fix
Update
- zyxel gs1900-8_firmware2.50\(aahh.0\)c0 or later
- zyxel gs1900-8hp_firmware2.50\(aahi.0\)c0 or later
- zyxel gs1900-10hp_firmware2.50\(aazi.0\)c0 or later
- zyxel gs1900-16_firmware2.50\(aahj.0\)c0 or later
- zyxel gs1900-24e_firmware2.50\(aahk.0\)c0 or later
- zyxel gs1900-24_firmware2.50\(aahl.0\)c0 or later
- zyxel gs1900-24hp_firmware2.50\(aahm.0\)c0 or later
- zyxel gs1900-48_firmware2.50\(aahn.0\)c0 or later
- zyxel gs1900-48hp_firmware2.50\(aaho.0\)c0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zyxel gs1900-8_firmware | v < 2.50\(aahh.0\)c0 | 2.50\(aahh.0\)c0 |
| zyxel gs1900-8hp_firmware | v < 2.50\(aahi.0\)c0 | 2.50\(aahi.0\)c0 |
| zyxel gs1900-10hp_firmware | v < 2.50\(aazi.0\)c0 | 2.50\(aazi.0\)c0 |
| zyxel gs1900-16_firmware | v < 2.50\(aahj.0\)c0 | 2.50\(aahj.0\)c0 |
| zyxel gs1900-24e_firmware | v < 2.50\(aahk.0\)c0 | 2.50\(aahk.0\)c0 |
| zyxel gs1900-24_firmware | v < 2.50\(aahl.0\)c0 | 2.50\(aahl.0\)c0 |
| zyxel gs1900-24hp_firmware | v < 2.50\(aahm.0\)c0 | 2.50\(aahm.0\)c0 |
| zyxel gs1900-48_firmware | v < 2.50\(aahn.0\)c0 | 2.50\(aahn.0\)c0 |
| zyxel gs1900-48hp_firmware | v < 2.50\(aaho.0\)c0 | 2.50\(aaho.0\)c0 |
Check your version
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