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CVE-2007-4559 Patch #89

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CVE-2007-4559 Patch #89

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42 changes: 40 additions & 2 deletions dnppy/convert/extract_archive.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,26 @@ def extract_archive(filepaths, delete_originals = False):
if filepath.endswith(".tar.gz"):
with tarfile.open(filepath, 'r:gz') as tfile:
outdir = os.path.join(head, tail.replace(".tar.gz",""))
tfile.extractall(outdir)
def is_within_directory(directory, target):

abs_directory = os.path.abspath(directory)
abs_target = os.path.abspath(target)

prefix = os.path.commonprefix([abs_directory, abs_target])

return prefix == abs_directory

def safe_extract(tar, path=".", members=None, *, numeric_owner=False):

for member in tar.getmembers():
member_path = os.path.join(path, member.name)
if not is_within_directory(path, member_path):
raise Exception("Attempted Path Traversal in Tar File")

tar.extractall(path, members, numeric_owner=numeric_owner)


safe_extract(tfile, outdir)

# gzip only compresses single files
elif filepath.endswith(".gz"):
Expand All @@ -42,7 +61,26 @@ def extract_archive(filepaths, delete_originals = False):
elif filepath.endswith(".tar"):
with tarfile.open(filepath, 'r') as tfile:
outdir = os.path.join(head, tail.replace(".tar",""))
tfile.extractall(outdir)
def is_within_directory(directory, target):

abs_directory = os.path.abspath(directory)
abs_target = os.path.abspath(target)

prefix = os.path.commonprefix([abs_directory, abs_target])

return prefix == abs_directory

def safe_extract(tar, path=".", members=None, *, numeric_owner=False):

for member in tar.getmembers():
member_path = os.path.join(path, member.name)
if not is_within_directory(path, member_path):
raise Exception("Attempted Path Traversal in Tar File")

tar.extractall(path, members, numeric_owner=numeric_owner)


safe_extract(tfile, outdir)

elif filepath.endswith(".zip"):
with zipfile.ZipFile(filepath, "r") as zipf:
Expand Down