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.
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.
> 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 textA 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.
References
Sim4n6 Reporter
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.
It seems that a remotely retrieved tarball which could be with the extension
.tar.gzhappens to be unpacked usingshutil.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.txtto a parent location rather than the current folder.A Potential Attack Scenario
../../../../../../../../etc/passwd, and then serve the archive remotely, thus, providing a possibility to overwrite the system files.Mitigation
Potential mitigation could be to:
zipfile...or absolute ones.References