An unrestricted file upload vulnerability in keywordsImport.php in TestLink 1.9.20 allows remote attackers to execute arbitrary code by uploading a file with an executable extension. This allows an authenticated attacker to upload a malicious file (containing PHP code to execute operating system commands) to a publicly accessible directory of the application.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-8639
• TestLinkOpenSourceTRMS/testlink-code@57d81ae
• https://ackcent.com/blog/testlink-1.9.20-unrestricted-file-upload-and-sql-injection/
• http://packetstormsecurity.com/files/161401/TestLink-1.9.20-Shell-Upload.html