CVE-2019-15801
High
Description
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.
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
Choose the product and enter the version you run to see whether it falls in the affected range.
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