CVE-2021-4463 Scanner

Longjing Technology BEMS API is a software platform used by industrial and commercial sectors for managing building energy systems. It is widely implemented in facilities management to provide insights into energy consumption patterns and assist in optimizing resource allocation. The software is designed to integrate with a variety of existing systems within an organization, allowing for seamless monitoring and control of all energy-related processes. Users can employ the BEMS API to develop custom applications that further enhance the capabilities of the technology. Known for its comprehensive data analytics features, this tool helps in tracking energy efficiency improvements over time. The myriad benefits have made it a critical component for organizations aiming to achieve sustainability goals.

This vulnerability identified in Longjing Technology BEMS API involves the arbitrary downloading of files. Exploited via directory traversal, the flaw is rooted in improper validation of input passed through the fileName parameter in the downloads API endpoint. An unauthenticated attacker can use this to access sensitive files beyond the specified directory limit. With the ability to retrieve private documents, the potential for information disclosure is significant. This vulnerability remains exploitable due to the neglect in applying comprehensive input validation checks. The risk is particularly pronounced in environments not following stringent security patching practices.

The technical specifics of this vulnerability revolve around the API's file download functionality. By supplying a malicious file path through the fileName parameter, the attacker can manipulate the endpoint to navigate outside the intended directory. This is achieved by sending a specially crafted HTTP GET request to the vulnerable domain. The response often returns privileged file content, verifying the success of the traversal attack. Error handling and input validation shortcomings in the API enable the attack to occur smoothly. Additionally, lack of authentication layers further exacerbates the exposure to unauthorized users.

Upon successful exploitation, sensitive data gets exposed which can lead to substantial damages for affected organizations. The individual or group exploiting the vulnerability might extract and sell confidential business records. Beyond financial implications, this could also lead to reputational harm and loss of client trust. Organizations might face legal ramifications if they are found to be non-compliant with data protection regulations. Subsequent vulnerabilities can be introduced into the system if the compromised data allows for further network exploitation. Therefore, addressing such vulnerabilities promptly is crucial for avoiding extensive damage.

REFERENCES

• https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5657.php
• https://packetstormsecurity.com/files/163702/
• https://nvd.nist.gov/vuln/detail/CVE-2021-4463
• https://www.cve.org/CVERecord?id=CVE-2021-4463
• https://www.exploit-db.com/exploits/50163