CVE-2026-1413: Sangfor Security Management System RCE Flaw

CVE-2026-1413 Overview

A command injection vulnerability has been identified in Sangfor Operation and Maintenance Security Management System versions up to 3.0.12. This vulnerability exists in the portValidate function within the /fort/ip_and_port/port_validate endpoint of the HTTP POST Request Handler component. Attackers can exploit this flaw by manipulating the port argument, enabling arbitrary command execution on the affected system. The vulnerability is remotely exploitable and public exploit information has been disclosed.

Critical Impact

Remote attackers with low privileges can inject and execute arbitrary commands on vulnerable Sangfor systems, potentially leading to complete system compromise, data exfiltration, or lateral movement within the network.

Affected Products

• Sangfor Operation and Maintenance Security Management System up to version 3.0.12
• Systems exposing the /fort/ip_and_port/port_validate HTTP endpoint

Discovery Timeline

• 2026-01-26 - CVE-2026-1413 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-1413

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as Injection. The portValidate function fails to properly sanitize user-supplied input in the port parameter before incorporating it into system commands. This allows an attacker to break out of the intended command context and inject malicious shell commands that execute with the privileges of the web application process.

The network-accessible nature of this vulnerability means that any authenticated user with access to the affected endpoint can potentially exploit the flaw. The low attack complexity combined with no user interaction requirements makes this vulnerability particularly attractive to threat actors seeking to establish persistence or pivot within enterprise environments.

Root Cause

The root cause of this vulnerability stems from insufficient input validation and sanitization within the portValidate function. When processing HTTP POST requests to the /fort/ip_and_port/port_validate endpoint, the application directly incorporates the user-supplied port argument into command execution routines without proper escaping or validation of shell metacharacters. This design flaw allows attackers to inject additional commands by embedding shell-specific syntax within the port parameter value.

Attack Vector

The attack vector for CVE-2026-1413 is network-based, requiring an authenticated attacker to send a crafted HTTP POST request to the vulnerable endpoint. The attacker manipulates the port parameter by injecting command separators (such as ;, |, &&, or backticks) followed by arbitrary commands. When the portValidate function processes this malicious input, the injected commands are executed on the underlying operating system.

The vulnerability can be exploited by constructing a malicious HTTP POST request targeting the /fort/ip_and_port/port_validate endpoint. An attacker would include shell metacharacters within the port parameter value to escape the intended command context and execute arbitrary system commands. For detailed technical information and proof-of-concept details, refer to the GitHub CVE Issue and VulDB entry #342802.

Detection Methods for CVE-2026-1413

Indicators of Compromise

• HTTP POST requests to /fort/ip_and_port/port_validate containing shell metacharacters (;, |, &&, `, $()) in the port parameter
• Unexpected process spawning from the web server process, particularly shell interpreters or system utilities
• Anomalous outbound network connections originating from the Sangfor management system
• Unusual file system activity or unauthorized modifications in system directories

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block command injection patterns in HTTP POST parameters targeting /fort/ip_and_port/port_validate
• Monitor application logs for requests containing suspicious characters in the port parameter
• Deploy endpoint detection and response (EDR) solutions to identify command execution anomalies from web application processes
• Configure intrusion detection systems (IDS) to alert on known command injection payload signatures

Monitoring Recommendations

• Enable verbose logging for the Sangfor Operation and Maintenance Security Management System web application
• Implement real-time alerting for HTTP requests containing shell metacharacters in POST parameters
• Monitor process creation events on systems running the affected software for unexpected child processes
• Review authentication logs for unusual access patterns to the affected endpoint

How to Mitigate CVE-2026-1413

Immediate Actions Required

• Restrict network access to the /fort/ip_and_port/port_validate endpoint using firewall rules or access control lists
• Implement strict input validation at the network perimeter using a web application firewall
• Review and audit user accounts with access to the affected functionality
• Monitor systems for signs of exploitation while awaiting vendor patches

Patch Information

No official patch information is currently available from Sangfor. Organizations should monitor vendor communications for security updates addressing this vulnerability. For the latest information, consult the VulDB entry and VulDB submission #736522 for updates on remediation guidance.

Workarounds

• Implement network segmentation to isolate the Sangfor management system from untrusted networks
• Deploy a reverse proxy with strict input filtering to sanitize the port parameter before forwarding requests
• Disable or restrict access to the vulnerable endpoint if the portValidate functionality is not business-critical
• Apply the principle of least privilege to limit the impact of successful exploitation

# Example: Restrict access to vulnerable endpoint using iptables
# Allow only trusted management subnet
iptables -A INPUT -p tcp --dport 443 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP