OS Command Injection in ZyXEL Communications Corp. products - CVE-2021-35032

Vulnerability identifier: #VU59129

CSH Severity: Low

CVSS v4: 8.5 [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]

CVE-ID: CVE-2021-35032

CWE-ID: CWE-78

Exploitation vector: Local access

Exploit availability: No public exploit available

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 libsal.so. A local user 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.

GS1900-8HP
GS1900-10HP
GS1900-16
GS1900-24E
GS1900-24EP
GS1900-24
GS1900-24HP
GS1900-24HPv2
GS1900-48
GS1900-48HP
GS1900-48HPv2

Install updates from vendor's website.

GS1900-8HP - update to 2.70
GS1900-10HP - update to 2.70
GS1900-16 - update to 2.70
GS1900-24E - update to 2.70
GS1900-24EP - update to 2.70
GS1900-24 - update to 2.70
GS1900-24HP - update to 2.70
GS1900-24HPv2 - update to 2.70
GS1900-48 - update to 2.70
GS1900-48HP - update to 2.70
GS1900-48HPv2 - update to 2.70

• https://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.shtml

• Multiple vulnerabilities in Zyxel GS1900, XGS1210 and XGS1250 series switches