CNVD-2021-64035 Scanner

Leadsec VPN is primarily used by organizations looking to secure remote network access for employees. The software facilitates secure VPN connections, allowing users to safely access corporate resources from offsite locations. Implemented in various industries, Leadsec VPN ensures encrypted communication channels, enhancing data protection and privacy. Typically deployed within IT infrastructures, it addresses concerns over unauthorized access by providing a controlled virtual environment. Network administrators favor Leadsec VPN for its ease of integration and robust security features suited for managing remote access needs. The software plays a crucial role in safeguarding sensitive business information exchanged over unsecured internet channels.

Arbitrary File Read vulnerabilities occur when an attacker can read unintended or sensitive files on a system. The flaw in Leadsec VPN allows malicious users to exploit the vulnerability to access confidential files that should not be accessible. Attackers can leverage this weakness to gain insights into the system's file structure or obtain critical configuration details. The vulnerability essentially bypasses access controls, leaving sensitive directories exposed to unauthorized reading. Such exposures could allow for further exploitation or attacks, considering the potential insights gained into the system’s operations. While direct modifications to files might not occur, the disclosed data can have severe repercussions.

The Leadsec VPN's endpoint is vulnerable to Arbitrary File Read attacks, which use specific crafted requests to access unauthorized files. Attackers exploit paths within request parameters to navigate directories and access files typically off-limits. Testing reveals that files like the system's password file can be accessed using modified path parameters. When targeted, the endpoint improperly processes file paths, lacking validation to restrict such exploitative requests. This lack of sanity checks on input data makes it feasible for attackers to extract sensitive information through methods such as directory traversal. Observations confirm the vulnerability when specific patterns in server responses indicate file content is being retrieved incorrectly.

Exploiting the Arbitrary File Read vulnerability can lead to exposure of sensitive information contained within the Leadsec VPN environment. Potential impacts include unauthorized access to user credentials or private organization data depicted in configuration files. The information obtained might aid attackers in planning further intrusions or attacks against the network. By knowing the internal layout and configurations of the system, malicious actors could navigate around implemented security measures more effectively. As a result, organizations might face data breaches or compromised network security posture, leading to severe operational and business implications. Maintaining control over the exposure level becomes challenging once this vulnerability is exploited.

REFERENCES

• https://avd.aliyun.com/detail?id=AVD-2021-888761
• https://www.cnvd.org.cn/flaw/show/CNVD-2021-64035