CVE-2018-25046: Path Traversal in code.cloudfoundry.org/archiver

Background

The code.cloudfoundry.org/archiver package is a Go library that provides functionality for creating and extracting archives. It is commonly used in applications that need to compress or decompress files. The vulnerability in this package allows for path traversal, which means that an attacker can manipulate file paths in a way that allows them to access files outside of the intended target directory.

Vulnerability Detail

The vulnerability arises from improper path sanitization in the code.cloudfoundry.org/archiver package. When processing archives that contain relative file paths, the package does not properly validate and sanitize these paths. As a result, an attacker can craft an archive that includes file paths that traverse outside of the intended directory. This can lead to files being written or overwritten in unintended locations, potentially allowing an attacker to overwrite critical system files or gain unauthorized access to sensitive information.

go get code.cloudfoundry.org/archiver@v0.0.0-20180523222229-09b5706aa936

Workaround

If updating the package is not immediately feasible, a possible workaround is to implement additional path validation and sanitization when processing archives. This can involve checking that the file paths are within the intended directory and rejecting any paths that attempt to traverse outside of it. Here is an example of how this can be done in Go:

import (
	"code.cloudfoundry.org/archiver"
	"path/filepath"
)

func processArchive(archivePath string) error {
	targetDir := "/path/to/target/directory"
	archive, err := archiver.New(archivePath)
	if err != nil {
		return err
	}

	for _, file := range archive.Files() {
		filePath := filepath.Join(targetDir, file.Path())
		if !filepath.HasPrefix(filePath, targetDir) {
			return fmt.Errorf("Invalid file path: %s", file.Path())
		}
		// Process the file
	}

	return nil
}

Conclusion

The code.cloudfoundry.org/archiver package is vulnerable to a path traversal vulnerability that can allow an attacker to access files outside of the intended target directory. To mitigate this vulnerability, it is recommended to update the package to a fixed version. If immediate updating is not possible, implementing additional path validation and sanitization can serve as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for code.cloudfoundry.org/archiver →

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