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CVE-2007-4559 Patch #1

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CVE-2007-4559 Patch #1

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42 changes: 40 additions & 2 deletions espa_api_client/Downloaders.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,26 @@ def set_destpath(destpath, file_ext):

if source_path.endswith(".tar.gz"):
with tarfile.open(source_path, 'r:gz') as tfile:
tfile.extractall(set_destpath(destination_path, ".tar.gz"))
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, set_destpath(destination_path,".tar.gz"))
ret = destination_path

# gzip only compresses single files
Expand All @@ -41,7 +60,26 @@ def set_destpath(destpath, file_ext):

elif source_path.endswith(".tar"):
with tarfile.open(source_path, 'r') as tfile:
tfile.extractall(set_destpath(destination_path, ".tar"))
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, set_destpath(destination_path,".tar"))
ret = destination_path

elif source_path.endswith(".zip"):
Expand Down