Vulnerabilities

2 via 10 paths

Dependencies

375

Source

GitHub

Commit

ec9f747e

Find, fix and prevent vulnerabilities in your code.

Severity
  • 1
  • 1
Status
  • 2
  • 0
  • 0

critical severity
new

Arbitrary File Upload

  • Vulnerable module: formidable
  • Introduced through: json-refs@3.0.15

Detailed paths

  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef json-refs@3.0.15 path-loader@1.0.10 superagent@3.8.3 formidable@1.2.6

Overview

Affected versions of this package are vulnerable to Arbitrary File Upload which allows attackers to execute arbitrary code via a crafted filename.

Note:

The conditions to be vulnerable are as follows:

  1. eval (user input) file name as code

  2. use the keepextension option

  3. use Linux or =iOS (where <>` are valid file chars)

  4. not using the filename option, or using it without validating user input

    Remediation

    Upgrade formidable to version 3.2.4 or higher.

    References

medium severity

Arbitrary File Write via Archive Extraction (Zip Slip)

  • Vulnerable module: decompress-tar
  • Introduced through: decompress@4.2.1, @serverless/utils@6.6.0 and others

Detailed paths

  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef decompress@4.2.1 decompress-tar@4.1.1
  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef decompress@4.2.1 decompress-tarbz2@4.1.1 decompress-tar@4.1.1
  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef decompress@4.2.1 decompress-targz@4.1.1 decompress-tar@4.1.1
  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef @serverless/utils@6.6.0 decompress@4.2.1 decompress-tar@4.1.1
  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef @serverless/utils@6.6.0 decompress@4.2.1 decompress-tarbz2@4.1.1 decompress-tar@4.1.1
  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef @serverless/utils@6.6.0 decompress@4.2.1 decompress-targz@4.1.1 decompress-tar@4.1.1
  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef @serverless/dashboard-plugin@6.2.2 @serverless/utils@6.6.0 decompress@4.2.1 decompress-tar@4.1.1
  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef @serverless/dashboard-plugin@6.2.2 @serverless/utils@6.6.0 decompress@4.2.1 decompress-tarbz2@4.1.1 decompress-tar@4.1.1
  • Introduced through: serverless@serverless/serverless#ec9f747ef93a386eb5dede5a2a22dadb9aa5ecef @serverless/dashboard-plugin@6.2.2 @serverless/utils@6.6.0 decompress@4.2.1 decompress-targz@4.1.1 decompress-tar@4.1.1

Overview

decompress-tar is a tar plugin for decompress.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). It is possible to bypass the security measures provided by decompress and conduct ZIP path traversal through symlinks.

PoC

const decompress = require('decompress');

decompress('slip.tar.gz', 'dist').then(files => {
    console.log('done!');
});

Details

It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a "../../file.exe" location and thus break out of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.

The following is an example of a zip archive with one benign file and one malicious file. Extracting the malicous file will result in traversing out of the target folder, ending up in /root/.ssh/ overwriting the authorized_keys file:


+2018-04-15 22:04:29 ..... 19 19 good.txt

+2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys

Remediation

There is no fixed version for decompress-tar.

References