1 files changed, 24 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/interpreters/python/cpython/2.7/CVE-2019-20907.patch b/nixpkgs/pkgs/development/interpreters/python/cpython/2.7/CVE-2019-20907.patch
new file mode 100644
index 00000000000..cf67ae2b51b
--- /dev/null
+++ b/nixpkgs/pkgs/development/interpreters/python/cpython/2.7/CVE-2019-20907.patch
@@ -0,0 +1,24 @@
+From 5a8d121a1f3ef5ad7c105ee378cc79a3eac0c7d4 Mon Sep 17 00:00:00 2001
+From: Rishi <rishi_devan@mail.com>
+Date: Wed, 15 Jul 2020 13:51:00 +0200
+Subject: [PATCH] bpo-39017: Avoid infinite loop in the tarfile module
+ (GH-21454)
+
+Avoid infinite loop when reading specially crafted TAR files using the tarfile module
+(CVE-2019-20907).
+---
+ Lib/tarfile.py                                    |   2 ++
+
+diff --git a/Lib/tarfile.py b/Lib/tarfile.py
+index e2b60532f6..6769066cab 100755
+--- a/Lib/tarfile.py
++++ b/Lib/tarfile.py
+@@ -1249,6 +1249,8 @@ class TarInfo(object):
+ 
+             length, keyword = match.groups()
+             length = int(length)
++            if length == 0:
++                raise InvalidHeaderError("invalid header")
+             value = buf[match.end(2) + 1:match.start(1) + length - 1]
+ 
+             # Normally, we could just use "utf-8" as the encoding and "strict"