The "tarfile" module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while processing a multi-block member such as GNUTYPE_LONGNAME or GNUTYPE_LONGLINK. This could result in a crafted tar archive being misinterpreted by the tarfile module compared to other implementations.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/python/cpython/issues/141707
cna@python.org
https://github.com/python/cpython/pull/143934
cna@python.org
https://mail.python.org/archives/list/security-announce@python.org/thread/EOMI5…
cna@python.org
https://github.com/python/cpython/commit/42d754e34c06e57ad6b8e7f92f32af679912d8…
cna@python.org