ZyXEL GS1900 Web Interface Parameter privileges management

Summaryinfo

A vulnerability classified as problematic has been found in ZyXEL GS1900. This impacts an unknown function of the component Web Interface. The manipulation as part of Parameter leads to privileges management. This vulnerability is documented as CVE-2019-15799. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in ZyXEL GS1900 (version now known). It has been rated as problematic. This issue affects some unknown processing of the component Web Interface. The manipulation as part of a Parameter leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality. The summary by CVE is:

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the same level of privileged access as administrators when connecting to the device via SSH (while their permissions via the web interface are in fact restricted). This allows normal users to obtain the administrative password by running the tech-support command via the CLI: this contains the encrypted passwords for all users on the device. As these passwords are encrypted using well-known and static parameters, they can be decrypted and the original passwords (including the administrator password) can be obtained.

The weakness was released 11/14/2019 (Website). The advisory is shared at zyxel.com. The identification of this vulnerability is CVE-2019-15799 since 08/29/2019. The exploitation is known to be easy. The attack may be initiated remotely. Required for exploitation is a simple authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/15/2019). MITRE ATT&CK project uses the attack technique T1068 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at VDB-145782, VDB-145783, VDB-145784 and VDB-145785. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• ZyXEL

Name

• GS1900

License

• commercial

Website

• Vendor: https://www.zyxel.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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