NS ASG Local File Inclusion Scanner

NS ASG is a security gateway management system from Netentsec, widely used in enterprises for network defense and secure gateway management. It is designed to oversee and safeguard network traffic, thus offering robust protection against various cyber threats. Primarily, it is implemented in IT environments that demand high security, spanning industries such as finance, healthcare, and government. Organizations utilize NS ASG to apply security policies, manage network operations, and mitigate external threats effectively. It allows for centralized management of network security devices, providing administrators with comprehensive control and oversight. The software's extensive functionality aids enterprises in maintaining compliance with security standards and managing their security ecosystem efficiently.

The Local File Inclusion (LFI) vulnerability is a critical security flaw that allows attackers to access sensitive files on the server by exploiting improper path handling within the application. It occurs when a web application dynamically includes files in an insecure manner, permitting attackers to manipulate input parameters such as file names or paths. This vulnerability may result in unauthorized access to sensitive data, exposure of configuration files, or even unintended code execution. Attackers exploiting LFI vulnerabilities often seek to retrieve sensitive information from server files, including password files, session data, and application source code. LFI poses a substantial risk as it can lead to data leakage, system compromise, and potentially provide a stepping stone for further attacks.

The technical aspect of the Local File Inclusion vulnerability in NS ASG revolves around the misconfigured parameters within the file inclusion mechanism. Within NS ASG, endpoints such as /admin/cert_download.php allow attackers to inject malicious file paths. Vulnerable parameters like 'certfile' can be manipulated to include unauthorized files on the server. The template demonstrates how the ../../../../ traversal pattern can be used to access critical system files like /etc/passwd. By misusing these parameters, attackers can access files that should be restricted, thus compromising the server's security integrity. These vulnerabilities, if unchecked, can expose sensitive server information that attackers could use to exploit additional weaknesses in the system.

When exploited, the Local File Inclusion vulnerability could lead to severe consequences for enterprises using NS ASG. Malicious users can access sensitive internal files, leading to data breaches and potentially exposing confidential information. Attackers could gather vital system configuration details, enabling them to orchestrate further attacks or gain unauthorized access to critical infrastructure. Data leakage from such vulnerabilities might result in regulatory non-compliance, damaging the reputation and financial stability of affected organizations. System downtime and security breaches due to exploited vulnerabilities can significantly impact operational efficiency and lead to substantial financial losses.

REFERENCES

• https://zhuanlan.zhihu.com/p/368054963
• http://wiki.xypbk.com/Web安全/网康%20NS-ASG安全网关/网康%20NS-ASG安全网关%20任意文件读取漏洞.md