Tenda AC7/AC9/AC10 goform/setUsbUnload dosystemCmd command injection

Summaryinfo

A vulnerability was found in Tenda AC7, AC9 and AC10. It has been rated as critical. The impacted element is the function dosystemCmd of the file goform/setUsbUnload. This manipulation causes command injection. This vulnerability appears as CVE-2018-14558. The attack may be initiated remotely. In addition, an exploit is available.

Detailsinfo

A vulnerability was found in Tenda AC7, AC9 and AC10 (version unknown). It has been declared as critical. Affected by this vulnerability is the function dosystemCmd of the file goform/setUsbUnload. The manipulation with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered on Tenda AC7 devices with firmware through V15.03.06.44_CN(AC7), AC9 devices with firmware through V15.03.05.19(6318)_CN(AC9), and AC10 devices with firmware through V15.03.06.23_CN(AC10). A command Injection vulnerability allows attackers to execute arbitrary OS commands via a crafted goform/setUsbUnload request. This occurs because the "formsetUsbUnload" function executes a dosystemCmd function with untrusted input.

The bug was discovered 07/21/2018. The weakness was presented 10/29/2018 (Website). The advisory is shared at github.com. This vulnerability is known as CVE-2018-14558 since 07/23/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a exploit are known. MITRE ATT&CK project uses the attack technique T1202 for this issue.

It is declared as attacked. The vulnerability was handled as a non-public zero-day exploit for at least 101 days. During that time the estimated underground price was around $0-$5k. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 05/03/2022:

Apply updates per vendor instructions.

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

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Productinfo

Type

• Router Operating System

Vendor

• Tenda

Name

• AC7
• AC9
• AC10

License

• commercial

Website

• Vendor: https://www.tenda.com.cn/

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