tarfile: Skip DIRTYPE normalization during GNU LONGNAME/LONGLINK handling

Description

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.

Affected Products

Also Affects

Downstream vendors/products affected by this vulnerability

References

• https://github.com/python/cpython/pull/143934(patch)
• https://github.com/python/cpython/issues/141707(issue-tracking)
• https://mail.python.org/archives/list/security-announce@python.org/thread/EOMI5I66ZMKQ2INNFT6T7IAIKUGPZYIE/(vendor-advisory)
• https://github.com/python/cpython/commit/42d754e34c06e57ad6b8e7f92f32af679912d8ab(patch)
• https://github.com/python/cpython/commit/7ad3093d76a748af55bdb1d2e8aad3638163b017(patch)
• https://github.com/python/cpython/commit/ae99fe3a33b43e303a05f012815cef60b611a9c7(patch)

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