CNVD-2021-49104 Scanner

Pan Micro E-office is a widely utilized software platform designed for workplace collaboration, document management, and communication. It is primarily used in corporate environments to facilitate streamlined office operations. Businesses rely on the software to manage various office tasks, enhance productivity, and ensure efficient workflow across departments. Pan Micro E-office is valued for its ease of use, comprehensive features, and ability to integrate with other enterprise applications. It is typically managed by IT professionals within organizations to ensure optimal performance and security. As a critical part of business operations, maintaining its security and functionality is a high priority for users.

The unrestricted file upload vulnerability allows remote attackers to upload arbitrary files to the server without proper restrictions. This can lead to the execution of malicious code or scripts on the vulnerable server. Such vulnerabilities arise when user input is not adequately validated or sanitized, allowing attackers to bypass security mechanisms. The ability to upload executables can lead to unauthorized access, manipulation of data, or even taking control of the system. Attackers can exploit this vulnerability to compromise the integrity, confidentiality, and availability of information on the affected system. Effective mitigation involves implementing strict file validation and maintaining robust security practices.

The vulnerability exists due to insufficient controls in the file upload functionality of the Pan Micro E-office. Specifically, an endpoint allows the upload of files without proper content-type validation or restrictions, accepting potentially harmful files disguised with benign extensions. The issue is found in the handling of multipart form data, where there should be strict checks to ensure only accepted file types are processed. An attacker can exploit this by uploading a PHP file that grants access or control over the application. The initial POST request to the upload endpoint followed by a GET request to verify file upload confirms the vulnerability. Ensuring the application only permits uploads of secure file types is critical to resolving this issue.

If an attacker successfully exploits this vulnerability, it can lead to unauthorized code execution and potentially full system compromise. Malicious files could be used to install backdoors, exfiltrate sensitive data, or escalate privileges within the network. This poses significant risks to the affected organization, including financial loss, data breaches, and damage to reputation. Furthermore, such vulnerabilities can be leveraged as a foothold for lateral movement within an enterprise’s infrastructure. Addressing these security gaps is crucial to protect against unauthorized access and data manipulation by attackers.

REFERENCES

• https://chowdera.com/2021/12/202112200602130067.html
• http://v10.e-office.cn