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| author | Rishi <rishi_devan@mail.com> | 2020-07-15 13:51:00 +0200 |
|---|---|---|
| committer | Petr Viktorin <pviktori@redhat.com> | 2020-07-15 17:28:12 +0200 |
| commit | bde4372aa1f39803f5c33f1415e88b000d403d00 (patch) | |
| tree | 9532089be9064f42f8e6a4a22bcac186fe8c3445 /Lib/test/test_tarfile.py | |
| parent | f52bf62fe12d46267e958f80dbe1f4425b55cd0f (diff) | |
| download | cpython-git-backport-5a8d121-3.5.tar.gz | |
[3.5] bpo-39017: Avoid infinite loop in the tarfile module (GH-21454)backport-5a8d121-3.5
Avoid infinite loop when reading specially crafted TAR files using the tarfile module
(CVE-2019-20907).
(cherry picked from commit 5a8d121a1f3ef5ad7c105ee378cc79a3eac0c7d4)
Co-authored-by: Rishi <rishi_devan@mail.com>
Diffstat (limited to 'Lib/test/test_tarfile.py')
| -rw-r--r-- | Lib/test/test_tarfile.py | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py index 1efb841bb2..2438fd3abf 100644 --- a/Lib/test/test_tarfile.py +++ b/Lib/test/test_tarfile.py @@ -394,6 +394,13 @@ class CommonReadTest(ReadTest): with self.assertRaisesRegex(tarfile.ReadError, "unexpected end of data"): tar.extractfile(t).read() + def test_length_zero_header(self): + # bpo-39017 (CVE-2019-20907): reading a zero-length header should fail + # with an exception + with self.assertRaisesRegex(tarfile.ReadError, "file could not be opened successfully"): + with tarfile.open(support.findfile('recursion.tar')) as tar: + pass + class MiscReadTestBase(CommonReadTest): def requires_name_attribute(self): pass |