CVE-2019-15802: zyxel gs1900-10hp_firmware Use of Hard-coded Credentials

Vulnerability summary

CVE-2019-15802 is a medium (CVSS 5.9) Use of Hard-coded Credentials vulnerability in zyxel gs1900-10hp_firmware. EPSS estimates a 1.50% chance of exploitation in the next 30 days, higher than 73.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 14-11-2019
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-798Use of Hard-coded CredentialsThe product contains hard-coded credentials, such as a password or cryptographic key.