CVE-2020-27304 – RCE via Directory Traversal in CivetWeb HTTP server
Blog post from JFrog
JFrog has identified a directory traversal vulnerability in CivetWeb, a widely used embeddable web server, affecting versions 1.8 through 1.14. This issue, which can lead to remote code execution if exploited, particularly impacts web applications using CivetWeb's built-in file upload handler. The vulnerability arises from a lack of path traversal sanitization in Linux and OSX builds, allowing malicious file uploads. CivetWeb maintainers have addressed the problem by updating the form-handling code to canonicalize filenames and modify the example code to filter out path separators, adhering to RFC standards. Automated vulnerability scanning technologies, such as JFrog Xray, can identify and assess the applicability of this CVE in software artifacts. The article emphasizes the importance of adhering to RFCs for secure web library implementations and acknowledges CivetWeb's maintainers for their prompt and thorough resolution of the issue.
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