CVE-2007-4559 Patch

ostap/tools/chopping.py

@@ -1172,7 +1172,26 @@ def __init__ ( self , weights_files ) :
                 ## tar.list()
                 tmpdir = self.tempdir ( prefix = 'ostap-chopping-weights-' )  
                 self.trash.add ( tmpdir ) 
-                tar.extractall ( path = tmpdir )                
+                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, path=tmpdir)
                 logger.debug ('Un-tar into temporary directory %s' % tmpdir ) 
                 weights_files  = [ os.path.join ( tmpdir , i ) for i in tar.getnames() ]
                 self.tmpfiles += weights_files