#VU22914 OS Command Injection in AC9 Router AC1200 Smart Dual-Band Gigabit WiFi Router - CVE-2019-5071

Vulnerability identifier: #VU22914

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-5071

CWE-ID: CWE-78

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
AC9 Router AC1200 Smart Dual-Band Gigabit WiFi Router
Hardware solutions / Routers for home users

Vendor: Shenzhen Tenda Technology Co.,Ltd.

Description

The vulnerability allows a local user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the "dns1" POST parameter in the "/goform/WanParameterSetting" resource. A local user attacker can send a specially crafted HTTP POST request and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AC9 Router AC1200 Smart Dual-Band Gigabit WiFi Router: 15.03.05.14 - 15.03.05.16

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External links
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0861

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.