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CVE-2007-4559 Patch #51

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CVE-2007-4559 Patch #51

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42 changes: 40 additions & 2 deletions ggd/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1150,7 +1150,26 @@ def extract_metarecipe_recipe_from_bz2(metarecipe_name, new_name, bz2_file_path)
try:
## Extract all files in the tarfile to "ggd_tmp"
with tarfile.open(bz2_file_path) as archive:
archive.extractall(tmp_dir)
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(archive, tmp_dir)
except Exception as e:
print("\n:ggd:ERROR: Unable to read {} as a tarfile".format(bz2_file_path))
print(str(e))
Expand Down Expand Up @@ -1319,7 +1338,26 @@ def update_metarecipe_metadata(
try:
## Extract all files in the tarfile to "ggd_tmp"
with tarfile.open(bz2_file_path) as archive:
archive.extractall(tmp_dir)
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(archive, tmp_dir)
except Exception as e:
print(
"\n:ggd:meta-recipe: !!ERROR!! Unable to read {} as a tarfile".format(
Expand Down