medium
6.5
CWE
22
Advisory Published
CVE Published
Updated

CVE-2022-23530: GuardDog vulnerable to arbitrary file write when scanning a specially-crafted remote PyPI package

First published: Mon Dec 05 2022(Updated: )

### Summary Unsafe extracting using `shutil.unpack_archive()` from a remotely retrieved tarball may lead to writing the extracted file to an unintended destination. ### Details Extracting files using `shutil.unpack_archive()` from a potentially malicious tarball without validating that the destination file path is within the intended destination directory can cause files outside the destination directory to be overwritten. The vulnerable code snippet is between [L153..158](https://github.com/DataDog/guarddog/blob/a1d064ceb09d39bb28deb6972bc0a278756ea91f/guarddog/scanners/package_scanner.py#L153..158). ```python response = requests.get(url, stream=True) with open(zippath, "wb") as f: f.write(response.raw.read()) shutil.unpack_archive(zippath, unzippedpath) ``` It seems that a remotely retrieved tarball which could be with the extension `.tar.gz` happens to be unpacked using `shutil.unpack_archive()` with no destination verification/limitation of the extracted files. ### PoC The PoC provided showcases the risk of extracting the non-harmless text file `sim4n6.txt` to a parent location rather than the current folder. ```bash > tar --list -f archive.tar tar: Removing leading `../../../' from member names ../../../sim4n6.txt > python3 Python 3.10.6 (main, Nov 2 2022, 18:53:38) [GCC 11.3.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import shutil >>> shutil.unpack_archive("archive.tar") >>> exit() > file ../../../sim4n6.txt ../../../sim4n6.txt: ASCII text ``` ### A Potential Attack Scenario - An attacker may craft a malicious tarball with a filename path, such as `../../../../../../../../etc/passwd`, and then serve the archive remotely, thus, providing a possibility to overwrite the system files. ### Mitigation Potential mitigation could be to: - Use a safer module, like `zipfile`. - Validate the location of the extracted files and discard those with malicious paths such as a relative path `..` or absolute ones.

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
Datadoghq Guarddog<0.1.8
pip/guarddog<=0.1.7
0.1.8

Remedy

https://github.com/DataDog/guarddog/commit/37c7d0767ba28f4df46117d478f97652594c491c

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Reference Links

Frequently Asked Questions

  • What is CVE-2022-23530?

    CVE-2022-23530 is a vulnerability in GuardDog, a CLI tool to identify malicious PyPI packages.

  • How does CVE-2022-23530 affect GuardDog?

    CVE-2022-23530 affects versions of GuardDog prior to v0.1.8.

  • What is the severity of CVE-2022-23530?

    The severity of CVE-2022-23530 is medium with a CVSS score of 6.5.

  • How can the vulnerability be exploited?

    The vulnerability can be exploited by scanning a specially-crafted remote PyPI package, allowing arbitrary file write.

  • Are there any fixes available for CVE-2022-23530?

    Yes, upgrading to version 0.1.8 or later of GuardDog resolves the vulnerability.

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