CVE-2025-15501: Sangfor O&M Security System RCE Flaw

CVE-2025-15501 Overview

A critical OS command injection vulnerability has been identified in Sangfor Operation and Maintenance Management System versions up to 3.0.8. The vulnerability affects the WriterHandle.getCmd function located in the /isomp-protocol/protocol/getCmd endpoint. Attackers can manipulate the sessionPath argument to inject arbitrary operating system commands, potentially leading to complete system compromise.

The vulnerability is remotely exploitable without authentication, making it particularly dangerous for organizations using the affected system. The exploit has been publicly disclosed and may be actively utilized by threat actors. Notably, the vendor was contacted early about this disclosure but did not respond.

Critical Impact

Remote unauthenticated attackers can execute arbitrary OS commands on affected Sangfor systems, potentially leading to full system compromise, data exfiltration, and lateral movement within the network.

Affected Products

• Sangfor Operation and Maintenance Security Management System up to version 3.0.8

Discovery Timeline

• 2026-01-09 - CVE-2025-15501 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-15501

Vulnerability Analysis

This vulnerability is classified as an OS command injection flaw (CWE-78) with an underlying command injection weakness (CWE-77). The affected function WriterHandle.getCmd fails to properly sanitize user-supplied input through the sessionPath parameter before incorporating it into system command execution.

The network-accessible nature of this vulnerability allows remote attackers to exploit it without requiring any authentication or user interaction. An attacker can craft malicious HTTP requests to the vulnerable /isomp-protocol/protocol/getCmd endpoint, embedding OS commands within the sessionPath argument that will be executed with the privileges of the web application process.

Successful exploitation grants attackers the ability to execute arbitrary commands on the underlying operating system, potentially allowing them to read sensitive configuration files, create backdoor accounts, deploy malware, pivot to other systems on the network, or completely take over the affected server.

Root Cause

The root cause of CVE-2025-15501 is improper input validation and sanitization within the WriterHandle.getCmd function. The sessionPath parameter is directly concatenated or interpolated into a system command without proper escaping or validation, allowing command separators and shell metacharacters to be injected.

This represents a classic command injection pattern where user-controlled input flows directly into command execution functions without adequate filtering of dangerous characters such as semicolons, pipes, backticks, or command substitution syntax.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by sending specially crafted HTTP requests to the /isomp-protocol/protocol/getCmd endpoint.

The malicious payload is delivered through the sessionPath parameter, where command injection metacharacters are used to break out of the intended command context and execute attacker-controlled commands. Common injection techniques include using command separators like ;, |, ||, &&, or command substitution with backticks or $() syntax.

Given the public disclosure of this exploit, organizations should assume that exploit techniques are readily available to threat actors. For detailed technical analysis, refer to the GitHub Issue Discussion and VulDB entry #340346.

Detection Methods for CVE-2025-15501

Indicators of Compromise

• Unusual HTTP requests to /isomp-protocol/protocol/getCmd containing shell metacharacters (;, |, &&, backticks, $()) in the sessionPath parameter
• Unexpected child processes spawned by the Sangfor web application service
• New unauthorized user accounts or SSH keys on systems running the affected software
• Anomalous outbound network connections from the Sangfor management system
• Suspicious command execution patterns in system logs correlating with web requests

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block command injection patterns in requests to /isomp-protocol/protocol/getCmd
• Implement network intrusion detection signatures for HTTP requests containing common command injection payloads targeting this endpoint
• Configure SIEM correlation rules to alert on command execution events originating from web application processes
• Monitor process trees for unusual command executions by the Sangfor application service account

Monitoring Recommendations

• Enable verbose logging on the Sangfor Operation and Maintenance Management System and forward logs to a centralized SIEM
• Implement file integrity monitoring on critical system files and directories
• Monitor for new scheduled tasks, cron jobs, or startup scripts that may indicate persistence mechanisms
• Track network connections from affected systems to identify potential command-and-control communications

How to Mitigate CVE-2025-15501

Immediate Actions Required

• Restrict network access to the Sangfor Operation and Maintenance Management System to trusted IP addresses only using firewall rules
• Place the affected system behind a web application firewall configured to block command injection attempts
• Disable or restrict access to the /isomp-protocol/protocol/getCmd endpoint if not critical to operations
• Conduct a security assessment to determine if the system has already been compromised
• Consider taking the affected system offline until a patch is available

Patch Information

No official patch information is currently available from Sangfor. The vendor was contacted early about this disclosure but did not respond. Organizations should monitor vendor communications for security updates and apply patches immediately when available.

For additional vulnerability details and updates, refer to:

• GitHub Issue Tracker
• VulDB CTI ID #340346
• VulDB Submission #727214

Workarounds

• Implement network segmentation to isolate the Sangfor management system from other critical infrastructure
• Deploy a reverse proxy with input validation to filter malicious requests before they reach the application
• Configure firewall rules to limit inbound access to the management interface to specific administrator IP addresses only
• If possible, disable the affected /isomp-protocol/protocol/getCmd functionality until a vendor patch is released
• Implement additional monitoring and logging to detect exploitation attempts

# Example: Restrict access to the vulnerable endpoint using iptables
# Allow only trusted management subnet
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Example: Nginx reverse proxy configuration to block suspicious requests
# Add to server block configuration
location /isomp-protocol/protocol/getCmd {
    # Block requests containing common command injection patterns
    if ($args ~* "(;|%3B|\||%7C|`|%60|\$\(|%24%28)") {
        return 403;
    }
    proxy_pass http://backend;
}