#VU78350 OS Command Injection in USG FLEX series and VPN series - CVE-2023-34139
Published: July 18, 2023
Vulnerability identifier: #VU78350
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2023-34139
CWE-ID: CWE-78
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerable software:
USG FLEX series
VPN series
USG FLEX series
VPN series
Software vendor:
ZyXEL Communications Corp.
ZyXEL Communications Corp.
Description
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper input validation in the Free Time WiFi hotspot feature. A remote unauthenticated attacker on the local network can pass specially crafted data to the application and execute arbitrary OS commands on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install updates from vendor's website.