CVE-2026-1412: Sangfor Security Management System RCE Flaw

CVE-2026-1412 Overview

A command injection vulnerability has been identified in Sangfor Operation and Maintenance Security Management System versions up to 3.0.12. The vulnerability exists in an unknown function within the /fort/audit/get_clip_img endpoint of the HTTP POST Request Handler component. Attackers can exploit this flaw by manipulating the frame or dirno arguments to inject arbitrary commands, potentially leading to unauthorized system access and code execution.

Critical Impact

Remote attackers can exploit this command injection vulnerability without authentication to execute arbitrary commands on affected Sangfor systems, potentially compromising the entire security management infrastructure.

Affected Products

• Sangfor Operation and Maintenance Security Management System up to version 3.0.12

Discovery Timeline

• 2026-01-26 - CVE-2026-1412 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-1412

Vulnerability Analysis

This command injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) affects the Sangfor Operation and Maintenance Security Management System. The vulnerable endpoint /fort/audit/get_clip_img fails to properly sanitize user-supplied input in the frame and dirno parameters before passing them to system commands.

The exploit has been publicly disclosed, increasing the risk of active exploitation. The network-accessible nature of this vulnerability allows attackers to target affected systems remotely without requiring any form of authentication or user interaction.

Root Cause

The root cause of this vulnerability stems from insufficient input validation and sanitization in the HTTP POST Request Handler component. When processing requests to the /fort/audit/get_clip_img endpoint, the application directly incorporates user-controlled values from the frame and dirno parameters into system-level commands without proper neutralization of shell metacharacters or command separators.

Attack Vector

The attack can be executed remotely over the network by sending crafted HTTP POST requests to the vulnerable /fort/audit/get_clip_img endpoint. An attacker can inject malicious commands through the frame or dirno parameters using common command injection techniques such as command chaining operators (;, &&, ||) or command substitution syntax.

The vulnerability allows unauthenticated remote attackers to execute arbitrary commands with the privileges of the web application process. Technical details and proof-of-concept information are available through the GitHub CVE Issue Discussion and VulDB Entry #342801.

Detection Methods for CVE-2026-1412

Indicators of Compromise

• Unusual HTTP POST requests targeting the /fort/audit/get_clip_img endpoint with suspicious payloads containing shell metacharacters
• Unexpected process spawning from the Sangfor web application service
• Log entries showing requests with frame or dirno parameters containing command separators like ;, &&, ||, or backticks

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing command injection patterns in POST parameters
• Deploy network intrusion detection signatures targeting the /fort/audit/get_clip_img endpoint with suspicious input patterns
• Monitor HTTP request logs for POST requests to the vulnerable endpoint containing shell metacharacters or encoded command separators

Monitoring Recommendations

• Enable detailed logging for all HTTP POST requests to the Sangfor management interface, particularly the /fort/audit/get_clip_img endpoint
• Implement real-time alerting for any process execution anomalies originating from the web service context
• Establish baseline behavior for the security management system and alert on deviations in process creation or network connections

How to Mitigate CVE-2026-1412

Immediate Actions Required

• Restrict network access to the Sangfor Operation and Maintenance Security Management System to trusted IP addresses only
• Implement web application firewall rules to filter malicious input targeting the /fort/audit/get_clip_img endpoint
• Consider temporarily disabling the affected functionality until a patch is available
• Monitor systems for signs of exploitation using the detection methods described above

Patch Information

At the time of publication, no official vendor patch has been announced for this vulnerability. Organizations should monitor Sangfor's security advisories for updates. Additional vulnerability details are available at VulDB #342801 and the VulDB Submission #736513.

Workarounds

• Implement strict input validation at the network perimeter using a WAF to block requests containing shell metacharacters
• Apply network segmentation to isolate the affected system from untrusted networks
• Use firewall rules to restrict access to the management interface to authorized administrative IP addresses only
• Enable enhanced logging and monitoring to detect exploitation attempts

# Example firewall rule to restrict access to management interface
# Adjust the IP ranges according to your trusted administrative networks
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP