Description
A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Zyxel / ATP series firmware5.10 through 5.21 Patch 1 – 5.10 through 5.21 Patch 1
- Zyxel / USG 20(W)-VPN firmware5.10 through 5.21 Patch 1 – 5.10 through 5.21 Patch 1
- Zyxel / USG FLEX 100(W) firmware5.00 through 5.21 Patch 1 – 5.00 through 5.21 Patch 1
- Zyxel / USG FLEX 200 firmware5.00 through 5.21 Patch 1 – 5.00 through 5.21 Patch 1
- Zyxel / USG FLEX 500 firmware5.00 through 5.21 Patch 1 – 5.00 through 5.21 Patch 1
- Zyxel / USG FLEX 50(W) firmware5.10 through 5.21 Patch 1 – 5.10 through 5.21 Patch 1
- Zyxel / USG FLEX 700 firmware5.00 through 5.21 Patch 1 – 5.00 through 5.21 Patch 1
- Zyxel / VPN series firmware4.60 through 5.21 Patch 1 – 4.60 through 5.21 Patch 1
Exploits & PoCs
- nucleiZyxel Firewall - OS Command Injectionby h1ei1,prajiteshsingh
References
- MISChttps://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtml
- EXPLOIThttp://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.html
- EXPLOIThttp://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.html
- EXPLOIThttp://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.html
- EXPLOIThttp://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.html