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gh-99889: Fix directory traversal security flaw in uu.decode() #104096

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Merged
gpshead merged 6 commits into from
May 9, 2023
Merged

gh-99889: Fix directory traversal security flaw in uu.decode() #104096

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087561f
pythongh-99889: Fix directory traversal security flaw in uu.decode()
samcarroll42 May 2, 2023
2d2b53a
📜🤖 Added by blurb_it.
blurb-it[bot] May 2, 2023
5791bd6
also check absolute paths and os.altsep
gpshead May 9, 2023
ee09838
ReSTify the news entry.
gpshead May 9, 2023
7c29894
Merge branch 'main' into main
gpshead May 9, 2023
6bc681e
Add a regression test.
gpshead May 9, 2023
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Add a regression test.
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@gpshead
gpshead committed May 9, 2023
commit 6bc681e6bbbd50c422d82748815893a895c1af18
28 changes: 28 additions & 0 deletions Lib/test/test_uu.py
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,34 @@ def test_newlines_escaped(self):
uu.encode(inp, out, filename)
self.assertIn(safefilename, out.getvalue())

def test_no_directory_traversal(self):
relative_bad = b"""\
begin 644 ../../../../../../../../tmp/test1
$86)C"@``
`
end
"""
with self.assertRaisesRegex(uu.Error, 'directory'):
uu.decode(io.BytesIO(relative_bad))
if os.altsep:
relative_bad_bs = relative_bad.replace(b'/', b'\\')
with self.assertRaisesRegex(uu.Error, 'directory'):
uu.decode(io.BytesIO(relative_bad_bs))

absolute_bad = b"""\
begin 644 /tmp/test2
$86)C"@``
`
end
"""
with self.assertRaisesRegex(uu.Error, 'directory'):
uu.decode(io.BytesIO(absolute_bad))
if os.altsep:
absolute_bad_bs = absolute_bad.replace(b'/', b'\\')
with self.assertRaisesRegex(uu.Error, 'directory'):
uu.decode(io.BytesIO(absolute_bad_bs))


class UUStdIOTest(unittest.TestCase):

def setUp(self):
Expand Down