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- Add CVE-2022-45061-DoS-by-IDNA-decode.patch to avoid

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CVE-2022-45061 (bsc#1205244) allowing DoS by IDNA decoding
  extremely long domain names.

OBS-URL: https://build.opensuse.org/package/show/devel:languages:python:Factory/python310?expand=0&rev=66
This commit is contained in:
Matej Cepl 2022-11-09 18:33:25 +00:00 committed by Git OBS Bridge
parent 7c8b7412f2
commit 00fe94daed
3 changed files with 99 additions and 0 deletions
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88
CVE-2022-45061-DoS-by-IDNA-decode.patch Normal file
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@ -0,0 +1,88 @@
From b8f89940de09a51fdbd8fe4705d3d1d7f1bb0c6a Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
<31488909+miss-islington@users.noreply.github.com>
Date: Mon, 7 Nov 2022 18:57:10 -0800
Subject: [PATCH] [3.11] gh-98433: Fix quadratic time idna decoding. (GH-99092)
(GH-99222)
There was an unnecessary quadratic loop in idna decoding. This restores
the behavior to linear.
(cherry picked from commit d315722564927c7202dd6e111dc79eaf14240b0d)
(cherry picked from commit a6f6c3a3d6f2b580f2d87885c9b8a9350ad7bf15)
Co-authored-by: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
---
Lib/encodings/idna.py | 32 ++++------
Lib/test/test_codecs.py | 6 +
Misc/NEWS.d/next/Security/2022-11-04-09-29-36.gh-issue-98433.l76c5G.rst | 6 +
3 files changed, 27 insertions(+), 17 deletions(-)
create mode 100644 Misc/NEWS.d/next/Security/2022-11-04-09-29-36.gh-issue-98433.l76c5G.rst
--- a/Lib/encodings/idna.py
+++ b/Lib/encodings/idna.py
@@ -39,23 +39,21 @@ def nameprep(label):
# Check bidi
RandAL = [stringprep.in_table_d1(x) for x in label]
- for c in RandAL:
- if c:
- # There is a RandAL char in the string. Must perform further
- # tests:
- # 1) The characters in section 5.8 MUST be prohibited.
- # This is table C.8, which was already checked
- # 2) If a string contains any RandALCat character, the string
- # MUST NOT contain any LCat character.
- if any(stringprep.in_table_d2(x) for x in label):
- raise UnicodeError("Violation of BIDI requirement 2")
-
- # 3) If a string contains any RandALCat character, a
- # RandALCat character MUST be the first character of the
- # string, and a RandALCat character MUST be the last
- # character of the string.
- if not RandAL[0] or not RandAL[-1]:
- raise UnicodeError("Violation of BIDI requirement 3")
+ if any(RandAL):
+ # There is a RandAL char in the string. Must perform further
+ # tests:
+ # 1) The characters in section 5.8 MUST be prohibited.
+ # This is table C.8, which was already checked
+ # 2) If a string contains any RandALCat character, the string
+ # MUST NOT contain any LCat character.
+ if any(stringprep.in_table_d2(x) for x in label):
+ raise UnicodeError("Violation of BIDI requirement 2")
+ # 3) If a string contains any RandALCat character, a
+ # RandALCat character MUST be the first character of the
+ # string, and a RandALCat character MUST be the last
+ # character of the string.
+ if not RandAL[0] or not RandAL[-1]:
+ raise UnicodeError("Violation of BIDI requirement 3")
return label
--- a/Lib/test/test_codecs.py
+++ b/Lib/test/test_codecs.py
@@ -1534,6 +1534,12 @@ class IDNACodecTest(unittest.TestCase):
self.assertEqual("pyth\xf6n.org".encode("idna"), b"xn--pythn-mua.org")
self.assertEqual("pyth\xf6n.org.".encode("idna"), b"xn--pythn-mua.org.")
+ def test_builtin_decode_length_limit(self):
+ with self.assertRaisesRegex(UnicodeError, "too long"):
+ (b"xn--016c"+b"a"*1100).decode("idna")
+ with self.assertRaisesRegex(UnicodeError, "too long"):
+ (b"xn--016c"+b"a"*70).decode("idna")
+
def test_stream(self):
r = codecs.getreader("idna")(io.BytesIO(b"abc"))
r.read(3)
--- /dev/null
+++ b/Misc/NEWS.d/next/Security/2022-11-04-09-29-36.gh-issue-98433.l76c5G.rst
@@ -0,0 +1,6 @@
+The IDNA codec decoder used on DNS hostnames by :mod:`socket` or :mod:`asyncio`
+related name resolution functions no longer involves a quadratic algorithm.
+This prevents a potential CPU denial of service if an out-of-spec excessive
+length hostname involving bidirectional characters were decoded. Some protocols
+such as :mod:`urllib` http ``3xx`` redirects potentially allow for an attacker
+to supply such a name.

7
python310.changes
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@ -1,3 +1,10 @@
-------------------------------------------------------------------
Wed Nov 9 18:31:23 UTC 2022 - Matej Cepl <mcepl@suse.com>
- Add CVE-2022-45061-DoS-by-IDNA-decode.patch to avoid
CVE-2022-45061 (bsc#1205244) allowing DoS by IDNA decoding
extremely long domain names.
-------------------------------------------------------------------
Thu Nov 3 21:35:28 UTC 2022 - Matej Cepl <mcepl@suse.com>

4
python310.spec
View File

@ -175,6 +175,9 @@ Patch38: 98437-sphinx.locale._-as-gettext-in-pyspecific.patch
# PATCH-FIX-UPSTREAM CVE-2022-42919-loc-priv-mulitproc-forksrv.patch bsc#1204886 mcepl@suse.com
# Avoid Linux specific local privilege escalation via the multiprocessing forkserver start method
Patch39: CVE-2022-42919-loc-priv-mulitproc-forksrv.patch
# PATCH-FIX-UPSTREAM CVE-2022-45061-DoS-by-IDNA-decode.patch bsc#1205244 mcepl@suse.com
# Avoid DoS by decoding IDNA for too long domain names
Patch40: CVE-2022-45061-DoS-by-IDNA-decode.patch
BuildRequires: autoconf-archive
BuildRequires: automake
BuildRequires: fdupes
@ -446,6 +449,7 @@ other applications.
%patch37 -p1
%patch38 -p1
%patch39 -p1
%patch40 -p1
# drop Autoconf version requirement
sed -i 's/^AC_PREREQ/dnl AC_PREREQ/' configure.ac