> About Author
Hi, I'm Sharon, a product manager at Chaitin Tech. We build SafeLine, an open-source Web Application Firewall built for real-world threats. While SafeLine focuses on HTTP-layer protection, our emergency response center monitors and responds to RCE and authentication vulnerabilities across the stack to help developers stay safe.
IP-guard is a security management software developed by Yixin Technology, focusing on data protection, employee behavior monitoring, and system management simplification.
In November 2023, a critical Remote Command Execution (RCE) vulnerability in IP-guard WebServer was publicly disclosed. This flaw allows attackers to execute arbitrary commands on the server, potentially taking full control. The exploit is simple and publicly available online. We strongly urge affected users to patch immediately.
Vulnerability Overview
Root Cause
In web applications, proper parameter validation is essential for security. The vulnerability arises from improper handling of a parameter meant to specify the document page to view. Due to lack of proper filtering and input sanitization, attackers can inject OS commands via this parameter, executing arbitrary commands on the server.
Exploitation Characteristics
Attack traffic features unusual HTTP GET requests where the vulnerable parameter—normally limited to numbers or predefined formats—contains OS commands. These commands often start with special characters like the pipe (||), followed by executable system commands.
Impact
Successful exploitation allows remote command execution, resulting in full server takeover. Attackers can then access or delete sensitive data, deploy malware, or use the compromised server as a platform for further attacks.
Affected Versions
- IP-guard versions earlier than 4.81.0307.0
Mitigation & Fix
Temporary Workarounds
- Deploy IDS/IPS and Web Application Firewalls (WAF) capable of detecting and blocking requests containing suspicious command injection patterns.
- Restrict IP-guard access to trusted IP addresses via network ACLs to reduce exposure.
- Avoid exposing IP-guard directly to the public internet unless necessary.
Official Patch
The vendor has released an updated version fixing this vulnerability. Please visit https://www.ip-guard.net/ or contact official support to upgrade to version 4.81.0307.0 or later as soon as possible.
Product Support
- YunTu fingerprint database supports identifying this product and detecting related exploit attempts.
- SafeLine WAF has released virtual patches to detect and block this attack vector.
Timeline
- Nov 8, 2023: Vulnerability publicly disclosed online.
- Nov 9, 2023: Changting Emergency Response Lab analyzed and reproduced the vulnerability.
- Nov 9, 2023: Changting Security Emergency Response Center issued an official advisory.
References
Stay safe and patch promptly!
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If you continue to experience issues, feel free to contact SafeLine support for further assistance.
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