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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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gh-99889: Fix directory traversal security flaw in uu.decode()
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@samcarroll42
samcarroll42 committed May 2, 2023
commit 087561fd4945a93b8c9b35e0ffc3a9fe4de1a5a8
2 changes: 2 additions & 0 deletions Lib/uu.py
100755 → 100644
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Expand Up @@ -134,6 +134,8 @@ def decode(in_file, out_file=None, mode=None, quiet=False):
out_file = hdrfields[2].rstrip(b' \t\r\n\f').decode("ascii")
if os.path.exists(out_file):
raise Error('Cannot overwrite existing file: %s' % out_file)
if '../' in out_file:
raise Error('Writing to %s would result in directory traversal' % out_file)
if mode is None:
mode = int(hdrfields[1], 8)
#
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