First published: Thu Nov 14 2019(Updated: )
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in sal_util_str_encrypt() in libsal.so.0.0. The parameters (salt, IV, and key data) are used to encrypt and decrypt all passwords using AES256 in CBC mode. With the parameters known, all previously encrypted passwords can be decrypted. This includes the passwords that are part of configuration backups or otherwise embedded as part of the firmware.
Credit: cve@mitre.org
Affected Software | Affected Version | How to fix |
---|---|---|
Zyxel GS1900-8 firmware | <2.50\(aahh.0\)c0 | |
Zyxel GS1900-8 | ||
Zyxel Gs1900-8hp Firmware | <2.50\(aahi.0\)c0 | |
Zyxel Gs1900-8hp | ||
Zyxel GS1900-10HP firmware | <2.50\(aazi.0\)c0 | |
Zyxel GS1900-10HP | ||
Zyxel Gs1900-16 Firmware | <2.50\(aahj.0\)c0 | |
Zyxel Gs1900-16 | ||
Zyxel Gs1900-24e Firmware | <2.50\(aahk.0\)c0 | |
Zyxel GS1900-24E | ||
Zyxel Gs1900-24 Firmware | <2.50\(aahl.0\)c0 | |
Zyxel GS1900-24 | ||
Zyxel Gs1900-24hp Firmware | <2.50\(aahm.0\)c0 | |
Zyxel Gs1900-24hp | ||
Zyxel Gs1900-48 Firmware | <2.50\(aahn.0\)c0 | |
Zyxel GS1900-48 | ||
Zyxel Gs1900-48hp Firmware | <2.50\(aaho.0\)c0 | |
Zyxel Gs1900-48hp |
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CVE-2019-15802 is a vulnerability found on Zyxel GS1900 devices that allows attackers to decrypt user passwords.
The severity of CVE-2019-15802 is medium with a CVSS score of 5.9.
Attackers can exploit CVE-2019-15802 by decrypting user passwords and gaining unauthorized access to the affected Zyxel GS1900 devices.
To fix CVE-2019-15802, update your Zyxel GS1900 device firmware to version 2.50(AAHH.0)C0 or later, as provided by Zyxel.
You can find more information about CVE-2019-15802 in the following references: [link 1](https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html), [link 2](https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml).