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CVE-2007-4559 Patch #69

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CVE-2007-4559 Patch #69

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42 changes: 40 additions & 2 deletions check-kernelpage.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,26 @@

def extract(filename):
with tarfile.open(filename) as tar:
tar.extractall()
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(tar)

else:
from urllib import urlretrieve
Expand All @@ -27,7 +46,26 @@ def extract(filename):
file_content = f.read()
fout.write(file_content)
with tarfile.open(filename[:-3]) as tar:
tar.extractall()
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(tar)

from configparser import ConfigParser
import os
Expand Down