Security fix for CVE-2025-8194
Resolves: RHEL-106333
This commit is contained in:
Lumir Balhar
parent
6e9b200e35
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00467-tarfile-cve-2025-8194.patch
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00467-tarfile-cve-2025-8194.patch
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From 738482c8b9a8a8f3ccdb678ad508a86d702a6751 Mon Sep 17 00:00:00 2001
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From: Lumir Balhar <lbalhar@redhat.com>
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Date: Mon, 11 Aug 2025 13:39:27 +0200
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Subject: [PATCH] 00467: tarfile CVE-2025-8194
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tarfile now validates archives to ensure member offsets are non-negative (GH-137027)
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Co-authored-by: Gregory P. Smith <greg@krypto.org>
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---
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Lib/tarfile.py | 3 +
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Lib/test/test_tarfile.py | 156 ++++++++++++++++++
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...-07-23-00-35-29.gh-issue-130577.c7EITy.rst | 3 +
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3 files changed, 162 insertions(+)
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create mode 100644 Misc/NEWS.d/next/Library/2025-07-23-00-35-29.gh-issue-130577.c7EITy.rst
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diff --git a/Lib/tarfile.py b/Lib/tarfile.py
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index 7d94b5c..3e03ebf 100755
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--- a/Lib/tarfile.py
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+++ b/Lib/tarfile.py
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@@ -1589,6 +1589,9 @@ class TarInfo(object):
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"""Round up a byte count by BLOCKSIZE and return it,
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e.g. _block(834) => 1024.
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"""
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+ # Only non-negative offsets are allowed
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+ if count < 0:
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+ raise InvalidHeaderError("invalid offset")
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blocks, remainder = divmod(count, BLOCKSIZE)
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if remainder:
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blocks += 1
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diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py
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index 01da819..0a7586a 100644
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--- a/Lib/test/test_tarfile.py
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+++ b/Lib/test/test_tarfile.py
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@@ -43,6 +43,7 @@ bz2name = os.path.join(TEMPDIR, "testtar.tar.bz2")
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xzname = os.path.join(TEMPDIR, "testtar.tar.xz")
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tmpname = os.path.join(TEMPDIR, "tmp.tar")
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dotlessname = os.path.join(TEMPDIR, "testtar")
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+SPACE = b" "
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sha256_regtype = (
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"e09e4bc8b3c9d9177e77256353b36c159f5f040531bbd4b024a8f9b9196c71ce"
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@@ -4018,6 +4019,161 @@ class TestExtractionFilters(unittest.TestCase):
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self.check_trusted_default(tar, tempdir)
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+class OffsetValidationTests(unittest.TestCase):
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+ tarname = tmpname
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+ invalid_posix_header = (
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+ # name: 100 bytes
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+ tarfile.NUL * tarfile.LENGTH_NAME
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+ # mode, space, null terminator: 8 bytes
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+ + b"000755" + SPACE + tarfile.NUL
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+ # uid, space, null terminator: 8 bytes
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+ + b"000001" + SPACE + tarfile.NUL
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+ # gid, space, null terminator: 8 bytes
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+ + b"000001" + SPACE + tarfile.NUL
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+ # size, space: 12 bytes
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+ + b"\xff" * 11 + SPACE
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+ # mtime, space: 12 bytes
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+ + tarfile.NUL * 11 + SPACE
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+ # chksum: 8 bytes
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+ + b"0011407" + tarfile.NUL
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+ # type: 1 byte
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+ + tarfile.REGTYPE
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+ # linkname: 100 bytes
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+ + tarfile.NUL * tarfile.LENGTH_LINK
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+ # magic: 6 bytes, version: 2 bytes
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+ + tarfile.POSIX_MAGIC
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+ # uname: 32 bytes
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+ + tarfile.NUL * 32
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+ # gname: 32 bytes
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+ + tarfile.NUL * 32
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+ # devmajor, space, null terminator: 8 bytes
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+ + tarfile.NUL * 6 + SPACE + tarfile.NUL
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+ # devminor, space, null terminator: 8 bytes
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+ + tarfile.NUL * 6 + SPACE + tarfile.NUL
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+ # prefix: 155 bytes
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+ + tarfile.NUL * tarfile.LENGTH_PREFIX
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+ # padding: 12 bytes
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+ + tarfile.NUL * 12
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+ )
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+ invalid_gnu_header = (
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+ # name: 100 bytes
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+ tarfile.NUL * tarfile.LENGTH_NAME
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+ # mode, null terminator: 8 bytes
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+ + b"0000755" + tarfile.NUL
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+ # uid, null terminator: 8 bytes
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+ + b"0000001" + tarfile.NUL
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+ # gid, space, null terminator: 8 bytes
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+ + b"0000001" + tarfile.NUL
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+ # size, space: 12 bytes
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+ + b"\xff" * 11 + SPACE
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+ # mtime, space: 12 bytes
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+ + tarfile.NUL * 11 + SPACE
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+ # chksum: 8 bytes
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+ + b"0011327" + tarfile.NUL
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+ # type: 1 byte
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+ + tarfile.REGTYPE
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+ # linkname: 100 bytes
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+ + tarfile.NUL * tarfile.LENGTH_LINK
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+ # magic: 8 bytes
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+ + tarfile.GNU_MAGIC
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+ # uname: 32 bytes
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+ + tarfile.NUL * 32
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+ # gname: 32 bytes
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+ + tarfile.NUL * 32
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+ # devmajor, null terminator: 8 bytes
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+ + tarfile.NUL * 8
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+ # devminor, null terminator: 8 bytes
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+ + tarfile.NUL * 8
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+ # padding: 167 bytes
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+ + tarfile.NUL * 167
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+ )
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+ invalid_v7_header = (
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+ # name: 100 bytes
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+ tarfile.NUL * tarfile.LENGTH_NAME
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+ # mode, space, null terminator: 8 bytes
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+ + b"000755" + SPACE + tarfile.NUL
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+ # uid, space, null terminator: 8 bytes
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+ + b"000001" + SPACE + tarfile.NUL
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+ # gid, space, null terminator: 8 bytes
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+ + b"000001" + SPACE + tarfile.NUL
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+ # size, space: 12 bytes
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+ + b"\xff" * 11 + SPACE
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+ # mtime, space: 12 bytes
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+ + tarfile.NUL * 11 + SPACE
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+ # chksum: 8 bytes
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+ + b"0010070" + tarfile.NUL
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+ # type: 1 byte
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+ + tarfile.REGTYPE
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+ # linkname: 100 bytes
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+ + tarfile.NUL * tarfile.LENGTH_LINK
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+ # padding: 255 bytes
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+ + tarfile.NUL * 255
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+ )
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+ valid_gnu_header = tarfile.TarInfo("filename").tobuf(tarfile.GNU_FORMAT)
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+ data_block = b"\xff" * tarfile.BLOCKSIZE
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+
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+ def _write_buffer(self, buffer):
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+ with open(self.tarname, "wb") as f:
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+ f.write(buffer)
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+
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+ def _get_members(self, ignore_zeros=None):
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+ with open(self.tarname, "rb") as f:
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+ with tarfile.open(
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+ mode="r", fileobj=f, ignore_zeros=ignore_zeros
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+ ) as tar:
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+ return tar.getmembers()
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+
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+ def _assert_raises_read_error_exception(self):
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+ with self.assertRaisesRegex(
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+ tarfile.ReadError, "file could not be opened successfully"
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+ ):
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+ self._get_members()
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+
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+ def test_invalid_offset_header_validations(self):
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+ for tar_format, invalid_header in (
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+ ("posix", self.invalid_posix_header),
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+ ("gnu", self.invalid_gnu_header),
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+ ("v7", self.invalid_v7_header),
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+ ):
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+ with self.subTest(format=tar_format):
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+ self._write_buffer(invalid_header)
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+ self._assert_raises_read_error_exception()
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+
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+ def test_early_stop_at_invalid_offset_header(self):
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+ buffer = self.valid_gnu_header + self.invalid_gnu_header + self.valid_gnu_header
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+ self._write_buffer(buffer)
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+ members = self._get_members()
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+ self.assertEqual(len(members), 1)
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+ self.assertEqual(members[0].name, "filename")
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+ self.assertEqual(members[0].offset, 0)
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+
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+ def test_ignore_invalid_archive(self):
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+ # 3 invalid headers with their respective data
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+ buffer = (self.invalid_gnu_header + self.data_block) * 3
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+ self._write_buffer(buffer)
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+ members = self._get_members(ignore_zeros=True)
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+ self.assertEqual(len(members), 0)
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+
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+ def test_ignore_invalid_offset_headers(self):
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+ for first_block, second_block, expected_offset in (
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+ (
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+ (self.valid_gnu_header),
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+ (self.invalid_gnu_header + self.data_block),
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+ 0,
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+ ),
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+ (
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+ (self.invalid_gnu_header + self.data_block),
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+ (self.valid_gnu_header),
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+ 1024,
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+ ),
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+ ):
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+ self._write_buffer(first_block + second_block)
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+ members = self._get_members(ignore_zeros=True)
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+ self.assertEqual(len(members), 1)
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+ self.assertEqual(members[0].name, "filename")
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+ self.assertEqual(members[0].offset, expected_offset)
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+
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+
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def setUpModule():
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support.unlink(TEMPDIR)
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os.makedirs(TEMPDIR)
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diff --git a/Misc/NEWS.d/next/Library/2025-07-23-00-35-29.gh-issue-130577.c7EITy.rst b/Misc/NEWS.d/next/Library/2025-07-23-00-35-29.gh-issue-130577.c7EITy.rst
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new file mode 100644
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index 0000000..342cabb
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Library/2025-07-23-00-35-29.gh-issue-130577.c7EITy.rst
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@@ -0,0 +1,3 @@
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+:mod:`tarfile` now validates archives to ensure member offsets are
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+non-negative. (Contributed by Alexander Enrique Urieles Nieto in
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+:gh:`130577`.)
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--
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2.50.1
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13
python3.spec
13
python3.spec
@ -14,7 +14,7 @@ URL: https://www.python.org/
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# WARNING When rebasing to a new Python version,
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# remember to update the python3-docs package as well
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Version: %{pybasever}.8
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Release: 70%{?dist}
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Release: 71%{?dist}
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License: Python
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@ -935,6 +935,12 @@ Patch444: 00444-security-fix-for-cve-2024-11168.patch
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# - downstream only patch that makes the changes work and compatible with Python 3.6
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Patch465: 00465-tarfile-cves.patch
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# 00467 #
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# tarfile CVE-2025-8194
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#
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# tarfile now validates archives to ensure member offsets are non-negative (GH-137027)
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Patch467: 00467-tarfile-cve-2025-8194.patch
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# (New patches go here ^^^)
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#
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# When adding new patches to "python" and "python3" in Fedora, EL, etc.,
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@ -1305,6 +1311,7 @@ GIT_DIR=$PWD git apply %{PATCH351}
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%patch443 -p1
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%patch444 -p1
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%patch465 -p1
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%patch467 -p1
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# Remove files that should be generated by the build
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# (This is after patching, so that we can use patches directly from upstream)
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@ -2236,6 +2243,10 @@ fi
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# ======================================================
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%changelog
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* Mon Aug 11 2025 Lumír Balhar <lbalhar@redhat.com> - 3.6.8-71
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- Security fix for CVE-2025-8194
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Resolves: RHEL-106333
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* Tue Jun 24 2025 Lumír Balhar <lbalhar@redhat.com> - 3.6.8-70
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- Security fixes for CVE-2025-4517, CVE-2025-4330, CVE-2025-4138, CVE-2024-12718, CVE-2025-4435
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Resolves: RHEL-98030, RHEL-97987, RHEL-98232, RHEL-98065, RHEL-98189
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