CVE-2021-33497: Path Traversal in Dutchcoders transfer.sh

Background

Dutchcoders transfer.sh is a Go package that provides a simple file sharing service. It allows users to upload and share files through a web interface. The package is widely used and popular among developers for its ease of use and simplicity. However, a vulnerability has been discovered in versions prior to 1.2.4 that allows for Directory Traversal, potentially leading to unauthorized access and deletion of files.

Vulnerability Detail

The vulnerability, identified as CVE-2021-33497, originates from a lack of proper input validation in the file deletion functionality of Dutchcoders transfer.sh. An attacker can exploit this vulnerability by manipulating the file path parameter to traverse directories and delete files outside the intended scope. This can result in the unauthorized deletion of sensitive files, leading to data loss or a compromise of the system's integrity. The severity of this vulnerability is rated as CRITICAL with a CVSS score of 9.1.

go get github.com/dutchcoders/transfer.sh@v1.6.1

go get github.com/dutchcoders/transfer.sh@v1.2.4

Workaround

If updating to the latest version is not immediately feasible, a temporary workaround can be implemented by adding additional input validation checks to the file deletion functionality. Specifically, the application should verify that the requested file path is within the expected directory structure and does not allow traversal outside of it. Here is an example of how this can be achieved in Go:

func deleteFile(filePath string) error {
    // Check if filePath is within the expected directory structure
    if !strings.HasPrefix(filePath, "/path/to/expected/directory") {
        return errors.New("Invalid file path")
    }

    // Proceed with file deletion
    // ...
}

Conclusion

In conclusion, Dutchcoders transfer.sh versions prior to 1.2.4 are vulnerable to a Directory Traversal issue that allows for unauthorized access and deletion of files. It is crucial to update to the latest version or apply the provided workaround to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for github.com/dutchcoders/transfer.sh →

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