CVE-2019-18952 Scanner

The Scanner is designed for Xfilesharing, a widely used file sharing software developed by SibSoft, which facilitates easy uploading and sharing of files over the internet. It is popular among websites allowing users to store and share files with others. Businesses and individuals alike use this product to manage large file transfers and data storage efficiently. File sharing services powered by Xfilesharing can be found in diverse sectors, such as media, education, and information technology, where robust data exchange is critical. The software's inherent flexibility and scalability make it suitable for a wide range of applications, from personal file storage to enterprise-level deployments.

The vulnerability present in Xfilesharing 2.5.1 is classified as an Arbitrary File Upload vulnerability. This security weakness allows attackers to upload malicious files onto a web server without authorization. This can be exploited to install malicious software, manipulate data, or execute harmful commands on the server. A successful attack exploiting this vulnerability can significantly compromise the integrity, confidentiality, and availability of the data and system resources. The importance of addressing this security flaw is essential to protect against unauthorized access or malicious attacks.

Technical details reveal that the vulnerability exists in the cgi-bin/up.cgi endpoint, where improper validation allows unauthorized file uploads. Attackers can exploit this by crafting requests that upload files with executable scripts, compromising server security. The scanner tests this by sending a POST request with a specially crafted file intended to confirm the execution capability of arbitrary code. Ensuring these uploads are possible points to a serious configuration flaw, which if unmitigated, becomes a gateway for further exploits and breaches.

Exploiting the Arbitrary File Upload vulnerability can lead to severe consequences. Once attackers have successfully uploaded a malicious file, they can perform various harmful actions, such as defacing websites, stealing sensitive data, or executing system commands. In the worst-case scenario, attackers can gain complete control over the server, resulting in a total system compromise. This could lead to significant data loss, service interruptions, and reputational damage to businesses utilizing Xfilesharing.

REFERENCES

• https://www.exploit-db.com/exploits/47659
• https://gist.github.com/pak0s/af9f640170aed335fdf6d110d468dbce
• https://nvd.nist.gov/vuln/detail/CVE-2019-18952