Package: python2.7
Severity: important
Tags: security
X-Debbugs-Cc: Debian Security Team <[email protected]>
Two security issues from past the 2.7.18 release. Backports
from 3.x are attached (I'm planning to submit these for 10.6).
Cheers,
Moritz
>From 47a2955589bdb1a114d271496ff803ad73f954b8 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
<[email protected]>
Date: Wed, 15 Jul 2020 05:36:36 -0700
Subject: [PATCH] bpo-39017: Avoid infinite loop in the tarfile module
(GH-21454) (#21485)
Avoid infinite loop when reading specially crafted TAR files using the tarfile
module
(CVE-2019-20907).
(cherry picked from commit 5a8d121a1f3ef5ad7c105ee378cc79a3eac0c7d4)
Co-authored-by: Rishi <[email protected]>
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index adf91d5..574a6bb 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1400,6 +1400,8 @@ 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]
keyword = keyword.decode("utf8")
Backport of 0b297d4ff1c0e4480ad33acae793fbaf4bf015b4, trimmed down to the
fix for CVE-2020-8492
Co-Authored-By: Serhiy Storchaka <[email protected]>
diff --git a/Lib/urllib2.py b/Lib/urllib2.py
index 8b634ad..11a62a4 100644
--- a/Lib/urllib2.py
+++ b/Lib/urllib2.py
@@ -856,8 +856,15 @@ class AbstractBasicAuthHandler:
# allow for double- and single-quoted realm values
# (single quotes are a violation of the RFC, but appear in the wild)
- rx = re.compile('(?:.*,)*[ \t]*([^ \t]+)[ \t]+'
- 'realm=(["\']?)([^"\']*)\\2', re.I)
+ rx = re.compile('(?:^|,)' # start of the string or ','
+ '[ \t]*' # optional whitespaces
+ '([^ \t]+)' # scheme like "Basic"
+ '[ \t]+' # mandatory whitespaces
+ # realm=xxx
+ # realm='xxx'
+ # realm="xxx"
+ 'realm=(["\']?)([^"\']*)\\2',
+ re.I)
# XXX could pre-emptively send auth info already accepted (RFC 2617,
# end of section 2, and section 1.2 immediately after "credentials"
