OS command injection in various ZyXEL routers



Published: 2020-11-24
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-29299
CWE-ID CWE-77
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		ZyXEL ZLD
Hardware solutions / Firmware

ZeXEL SD-OS
Hardware solutions / Firmware

Vendor ZyXEL Communications Corp.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Command Injection

EUVDB-ID: #VU48620

Risk: Low

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-29299

CWE-ID: CWE-77 - Command injection

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Affected series Patch available in
VPN series
  • On-premise: ZLD V4.39 week38* and above
  • Orchestrator: SD-OS V10.03 week32* and above
USG series ZLD V4.39 week38* and above
USG FLEX series ZLD V4.55 week38* and above
ATP series ZLD V4.55 week38* and above
NSG series V1.33 patch 4** and above

Vulnerable software versions

ZyXEL ZLD: All versions

ZeXEL SD-OS: All versions

External links

http://www.zyxel.com/support/Zyxel-security-advisory-for-command-injection-vulnerability-of-firewalls.shtml


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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



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