From 22748a83d927d3da1beaed771be30887c42b2500 Mon Sep 17 00:00:00 2001 From: Artem Bulgakov Date: Mon, 7 Sep 2020 19:46:33 +0300 Subject: bpo-41316: Make tarfile follow specs for FNAME (GH-21511) tarfile writes full path to FNAME field of GZIP format instead of just basename if user specified absolute path. Some archive viewers may process file incorrectly. Also it creates security issue because anyone can know structure of directories on system and know username or other personal information. RFC1952 says about FNAME: This is the original name of the file being compressed, with any directory components removed. So tarfile must remove directory names from FNAME and write only basename of file. Automerge-Triggered-By: @jaraco --- Lib/tarfile.py | 2 ++ 1 file changed, 2 insertions(+) (limited to 'Lib/tarfile.py') diff --git a/Lib/tarfile.py b/Lib/tarfile.py index 6769066cab..1fae29430f 100755 --- a/Lib/tarfile.py +++ b/Lib/tarfile.py @@ -420,6 +420,8 @@ class _Stream: self.__write(b"\037\213\010\010" + timestamp + b"\002\377") if self.name.endswith(".gz"): self.name = self.name[:-3] + # Honor "directory components removed" from RFC1952 + self.name = os.path.basename(self.name) # RFC1952 says we must use ISO-8859-1 for the FNAME field. self.__write(self.name.encode("iso-8859-1", "replace") + NUL) -- cgit v1.2.1