Vulnerability identifier: #VU78350
Vulnerability risk: Medium
CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-78
Exploitation vector: Local network
Exploit availability: No
Vulnerable software:
USG FLEX series
Client/Desktop applications /
Antivirus software/Personal firewalls
VPN series
Client/Desktop applications /
Antivirus software/Personal firewalls
Vendor: 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.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
USG FLEX series: 4.50 - 5.36 Patch 2
VPN series: 4.20 - 5.36 Patch 2
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.