ZyXEL GS1900 prior 2.50(AAHH.0)C0 Configuration Backup libsal.so.0.0 sal_util_str_encrypt hard-coded credentials

Summaryinfo

A vulnerability, which was classified as critical, was found in ZyXEL GS1900. Affected by this issue is the function sal_util_str_encrypt of the file libsal.so.0.0 of the component Configuration Backup. Such manipulation leads to hard-coded credentials. This vulnerability is traded as CVE-2019-15802. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in ZyXEL GS1900. Affected by this issue is the function sal_util_str_encrypt of the file libsal.so.0.0 of the component Configuration Backup. The manipulation with an unknown input leads to a hard-coded credentials vulnerability. Using CWE to declare the problem leads to CWE-798. The product contains hard-coded credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was shared 11/14/2019 (Website). The advisory is shared for download at zyxel.com. This vulnerability is handled as CVE-2019-15802 since 08/29/2019. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1110.001.

Upgrading to version 2.50(AAHH.0)C0 eliminates this vulnerability.

The entries VDB-145781, VDB-145782, VDB-145783 and VDB-145785 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• ZyXEL

Name

• GS1900

License

• commercial

Website

• Vendor: https://www.zyxel.com/

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