CVE-2025-1448: Synway SMG Gateway RCE Vulnerability

CVE-2025-1448 Overview

CVE-2025-1448 is a command injection vulnerability in Synway SMG Gateway Management Software through version 20250204. The flaw resides in the 9-12ping.php script, where the retry parameter is passed to a system command without proper sanitization. Remote attackers can inject arbitrary operating system commands through this parameter without authentication. The vulnerability is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component. The exploit has been disclosed publicly, and the vendor did not respond to disclosure attempts.

Critical Impact
Unauthenticated attackers can execute arbitrary commands on the gateway management host over the network, leading to compromise of the SMG appliance and any connected telephony infrastructure.

Affected Products

Synway SMG Gateway Management Software up to and including version 20250204
Vulnerable component: 9-12ping.php
Vulnerable parameter: retry

Discovery Timeline

2025-02-19 - CVE-2025-1448 published to the National Vulnerability Database
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-1448

Vulnerability Analysis

The vulnerability affects the 9-12ping.php endpoint of the Synway SMG Gateway Management Software web interface. This script accepts user-supplied input via the retry HTTP parameter and incorporates it into a system command without sanitization or validation. An attacker can append shell metacharacters such as ;, |, or backticks to break out of the intended command context.

The issue is classified as [CWE-74], a broad category covering improper neutralization of special elements passed to downstream interpreters. In this case, the downstream interpreter is the underlying operating system shell. The current EPSS probability is approximately 1.06% with a percentile of 77.9, indicating moderate likelihood of exploitation activity.

The disclosure indicates the attack can be initiated remotely with no authentication required and low attack complexity. Public proof-of-concept details are available through the linked external references.

Root Cause

The root cause is the direct concatenation of unsanitized user input from the retry parameter into a shell command, likely via PHP functions such as shell_exec, exec, system, or passthru. Without input validation, an allowlist of acceptable characters, or use of safe command execution APIs, attackers control portions of the executed command line.

Attack Vector

The attack vector is network-based. An attacker sends a crafted HTTP request to the 9-12ping.php endpoint with a malicious payload in the retry parameter. Because no authentication is required, any actor with network reachability to the gateway management interface can trigger the flaw.

No verified exploit code is reproduced here. Technical details and disclosure artifacts are available at the GitHub CVE Issue Discussion and VulDB entry #296135.

Detection Methods for CVE-2025-1448

Indicators of Compromise

HTTP requests targeting /9-12ping.php containing shell metacharacters such as ;, &, |, $(, or backticks in the retry parameter
Unexpected child processes spawned by the web server account, such as sh, bash, wget, curl, or nc
Outbound network connections from the gateway host to unfamiliar external IP addresses immediately following requests to 9-12ping.php
New or modified files in web-accessible directories that could indicate webshell deployment

Detection Strategies

Inspect web server access logs for requests to 9-12ping.php with abnormally long or special-character-laden retry values
Deploy web application firewall rules that block shell metacharacters in query string and POST body parameters bound for the management interface
Correlate web request logs with host-level process execution logs to identify command injection chains

Monitoring Recommendations

Enable verbose HTTP access logging on the SMG management interface and forward logs to a centralized SIEM for correlation
Monitor process creation events on the gateway host, paying particular attention to processes spawned by the PHP or web server user
Alert on outbound connections from the gateway management host to non-corporate destinations

How to Mitigate CVE-2025-1448

Immediate Actions Required

Restrict network access to the SMG Gateway management interface using firewall rules or access control lists, allowing only trusted administrative networks
Place the management interface behind a VPN or jump host until a vendor patch is available
Audit web server and host logs for prior exploitation attempts against 9-12ping.php
Rotate credentials and review configurations on any device suspected of compromise

Patch Information

At the time of publication, no vendor patch is available. The disclosure record states that Synway was contacted prior to public release but did not respond. Administrators should monitor the VulDB advisory and Synway support channels for any subsequent fixed release.

Workarounds

Block external access to the 9-12ping.php endpoint at the reverse proxy or web server layer until a patch is released
Apply a web application firewall signature that rejects requests containing shell metacharacters in the retry parameter
Disable the diagnostic ping feature if it is not required for operations
Segment the gateway management network from general-purpose corporate and guest networks

bash

# Example nginx snippet to block requests containing shell metacharacters in the retry parameter
location = /9-12ping.php {
    if ($arg_retry ~* "[;&|`$()<>\\]") {
        return 403;
    }
    # additional access control
    allow 10.0.0.0/8;
    deny all;
}