SB2020112409 - OS command injection in various ZyXEL routers
Published: November 24, 2020
Security Bulletin ID
SB2020112409
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Command Injection (CVE-ID: CVE-2020-29299)
CWE-ID: CWE-77 - Command injection
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote user to execute arbitrary commands on the system.
The vulnerability exists due to insufficient validation of user supplied input n the “chg_exp_pwd” CGI program on some Zyxel security firewalls. A remote authenticated user can inject and execute arbitrary OS commands with elevated privileges.
Remediation
Install update from vendor's website.