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4 changed files with 159 additions and 27 deletions

2
.gitignore vendored
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@ -1 +1 @@
SOURCES/jwcrypto-0.5.0.tar.gz
SOURCES/jwcrypto-0.8.tar.gz

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@ -1 +1 @@
8eccc6fbeeee2fedc602998a7c7a97b8bd550e59 SOURCES/jwcrypto-0.5.0.tar.gz
038ee5faf896548477c0b57c3cacb92add36e550 SOURCES/jwcrypto-0.8.tar.gz

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@ -0,0 +1,74 @@
From 90477a3b6e73da69740e00b8161f53fea19b831f Mon Sep 17 00:00:00 2001
From: Simo Sorce <simo@redhat.com>
Date: Tue, 5 Mar 2024 16:57:17 -0500
Subject: [PATCH] Address potential DoS with high compression ratio
Fixes CVE-2024-28102
Signed-off-by: Simo Sorce <simo@redhat.com>
---
jwcrypto/jwe.py | 7 +++++++
jwcrypto/tests.py | 26 ++++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/jwcrypto/jwe.py b/jwcrypto/jwe.py
index 9412881..5df500b 100644
--- a/jwcrypto/jwe.py
+++ b/jwcrypto/jwe.py
@@ -10,5 +10,8 @@
from jwcrypto.jwa import JWA
+# Limit the amount of data we are willing to decompress by default.
+default_max_compressed_size = 256 * 1024
+
# RFC 7516 - 4.1
# name: (description, supported?)
@@ -387,6 +387,10 @@ def _decrypt(self, key, ppe):
compress = jh.get('zip', None)
if compress == 'DEF':
+ if len(data) > default_max_compressed_size:
+ raise InvalidJWEData(
+ 'Compressed data exceeds maximum allowed'
+ 'size' + f' ({default_max_compressed_size})')
self.plaintext = zlib.decompress(data, -zlib.MAX_WBITS)
elif compress is None:
self.plaintext = data
diff --git a/jwcrypto/tests.py b/jwcrypto/tests.py
index bb2ff10..59049f8 100644
--- a/jwcrypto/tests.py
+++ b/jwcrypto/tests.py
@@ -1526,6 +1526,32 @@ def test_pbes2_hs256_aeskw_custom_params(self):
token.deserialize(jwt=e)
json_decode(token.claims)
+ def test_jwe_decompression_max(self):
+ key = jwk.JWK(kty='oct', k=base64url_encode(b'A' * (128 // 8)))
+ payload = '{"u": "' + "u" * 400000000 + '", "uu":"' \
+ + "u" * 400000000 + '"}'
+ protected_header = {
+ "alg": "A128KW",
+ "enc": "A128GCM",
+ "typ": "JWE",
+ "zip": "DEF",
+ }
+ enc = jwe.JWE(payload.encode('utf-8'),
+ recipient=key,
+ protected=protected_header).serialize(compact=True)
+ with self.assertRaises(jwe.InvalidJWEData):
+ check = jwe.JWE()
+ check.deserialize(enc)
+ check.decrypt(key)
+
+ defmax = jwe.default_max_compressed_size
+ jwe.default_max_compressed_size = 1000000000
+ # ensure we can eraise the limit and decrypt
+ check = jwe.JWE()
+ check.deserialize(enc)
+ check.decrypt(key)
+ jwe.default_max_compressed_size = defmax
+
class JWATests(unittest.TestCase):
def test_jwa_create(self):

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@ -5,7 +5,7 @@
%bcond_with python3
%endif
%if 0%{?rhel} > 7
%if 0%{?fedora} > 31 || 0%{?rhel} > 7
# Disable python2 build by default
%bcond_with python2
%else
@ -15,22 +15,25 @@
%global srcname jwcrypto
Name: python-%{srcname}
Version: 0.5.0
Release: 1.1%{?dist}
Version: 0.8
Release: 5%{?dist}
Summary: Implements JWK, JWS, JWE specifications using python-cryptography
License: LGPLv3+
URL: https://github.com/latchset/%{srcname}
Source0: https://github.com/latchset/%{srcname}/releases/download/v%{version}/%{srcname}-%{version}.tar.gz
Patch1: 0001-Address-potential-DoS-with-high-compression-ratio_rhel#28698.patch
BuildArch: noarch
%if %{with python2}
%if 0%{?with_python2}
BuildRequires: python2-devel
BuildRequires: python2-setuptools
BuildRequires: python2-cryptography >= 1.5
BuildRequires: python2-pytest
%endif
%if %{with python3}
%if 0%{?with_python3}
BuildRequires: python%{python3_pkgversion}-devel
BuildRequires: python%{python3_pkgversion}-setuptools
BuildRequires: python%{python3_pkgversion}-cryptography >= 1.5
@ -40,7 +43,8 @@ BuildRequires: python%{python3_pkgversion}-pytest
%description
Implements JWK, JWS, JWE specifications using python-cryptography
%if %{with python2}
%if 0%{?with_python2}
%package -n python2-%{srcname}
Summary: Implements JWK,JWS,JWE specifications using python-cryptography
Requires: python2-cryptography >= 1.5
@ -50,7 +54,8 @@ Requires: python2-cryptography >= 1.5
Implements JWK, JWS, JWE specifications using python-cryptography
%endif
%if %{with python3}
%if 0%{?with_python3}
%package -n python%{python3_pkgversion}-%{srcname}
Summary: Implements JWK, JWS, JWE specifications using python-cryptography
Requires: python%{python3_pkgversion}-cryptography >= 1.5
@ -64,39 +69,45 @@ Implements JWK, JWS, JWE specifications using python-cryptography
%prep
%setup -q -n %{srcname}-%{version}
%autopatch -p 1
%build
%if %{with python2}
%if 0%{?with_python2}
%py2_build
%endif
%if %{with python3}
%if 0%{?with_python3}
%py3_build
%endif
%check
%if %{with python2}
%if 0%{?with_python2}
%{__python2} -bb -m pytest %{srcname}/test*.py
%endif
%if %{with python3}
%if 0%{?with_python3}
%{__python3} -bb -m pytest %{srcname}/test*.py
%endif
%install
%if %{with python2}
%if 0%{?with_python2}
%py2_install
%endif
%if 0%{?with_python3}
%py3_install
%endif
rm -rf %{buildroot}%{_docdir}/%{srcname}
%if 0%{?with_python2}
rm -rf %{buildroot}%{python2_sitelib}/%{srcname}/tests{,-cookbook}.py*
%endif
%if %{with python3}
%py3_install
%if 0%{?with_python3}
rm -rf %{buildroot}%{python3_sitelib}/%{srcname}/tests{,-cookbook}.py*
rm -rf %{buildroot}%{python3_sitelib}/%{srcname}/__pycache__/tests{,-cookbook}.*.py*
%endif
rm -rf %{buildroot}/usr/share/doc/jwcrypto
%if %{with python2}
%if 0%{?with_python2}
%files -n python2-%{srcname}
%doc README.md
%license LICENSE
@ -104,7 +115,7 @@ rm -rf %{buildroot}/usr/share/doc/jwcrypto
%{python2_sitelib}/%{srcname}-%{version}-py%{python2_version}.egg-info
%endif
%if %{with python3}
%if 0%{?with_python3}
%files -n python%{python3_pkgversion}-%{srcname}
%doc README.md
%license LICENSE
@ -114,18 +125,65 @@ rm -rf %{buildroot}/usr/share/doc/jwcrypto
%changelog
* Fri Jun 17 2022 Christian Heimes <cheimes@redhat.com> - 0.5.0-1.1
- Bump dist to solve version sorting issue, fixes RHBZ#2097800
* Thu Apr 04 2024 Rafael Jeffman <rjeffman@redhat.com> - 0.8-5
- Address potential DoS with high compression ratio
Resolves: RHEL-28698
* Thu Jun 28 2018 Christian Heimes <cheimes@redhat.com> - 0.5.0-1
* Tue Aug 10 2021 Mohan Boddu <mboddu@redhat.com> - 0.8-4
- Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
Related: rhbz#1991688
* Fri Apr 16 2021 Mohan Boddu <mboddu@redhat.com> - 0.8-3
- Rebuilt for RHEL 9 BETA on Apr 15th 2021. Related: rhbz#1947937
* Wed Jan 27 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.8-2
- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
* Tue Dec 01 2020 Simo Sorce <simo@redhat.com> - 0.8-1
- Sync with upstream release 0.8
* Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.6.0-9
- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Tue May 26 2020 Miro Hrončok <mhroncok@redhat.com> - 0.6.0-8
- Rebuilt for Python 3.9
* Thu Jan 30 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.6.0-7
- Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
* Thu Oct 03 2019 Miro Hrončok <mhroncok@redhat.com> - 0.6.0-6
- Rebuilt for Python 3.8.0rc1 (#1748018)
* Thu Aug 29 2019 Christian Heimes <cheimes@redhat.com> - 0.6.0-5
- Remove Python 2 subpackages from F32+
- Resolves: RHBZ #1746760
* Mon Aug 19 2019 Miro Hrončok <mhroncok@redhat.com> - 0.6.0-4
- Rebuilt for Python 3.8
* Fri Jul 26 2019 Fedora Release Engineering <releng@fedoraproject.org> - 0.6.0-3
- Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
* Sat Feb 02 2019 Fedora Release Engineering <releng@fedoraproject.org> - 0.6.0-2
- Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild
* Mon Nov 05 2018 Christian Heimes <cheimes@redhat.com> - 0.6.0-1
- New upstream release 0.6.0
* Sat Jul 14 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.0-3
- Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild
* Mon Jul 02 2018 Miro Hrončok <mhroncok@redhat.com> - 0.5.0-2
- Rebuilt for Python 3.7
* Wed Jun 27 2018 Christian Heimes <cheimes@redhat.com> - 0.5.0-1
- New upstream release 0.5.0
- Fixes Coverity scan issue
* Mon Apr 16 2018 Christian Heimes <cheimes@redhat.com> - 0.4.2-5
- Drop Python 2 subpackages from RHEL 8, fixes RHBZ#1567152
* Tue Jun 19 2018 Miro Hrončok <mhroncok@redhat.com> - 0.4.2-5
- Rebuilt for Python 3.7
* Thu Nov 23 2017 Christian Heimes <cheimes@redhat.com> - 0.4.2-4
- Build Python 3 package on RHEL > 7, fixes RHBZ#1516813
* Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.4.2-4
- Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
* Wed Aug 02 2017 Christian Heimes <cheimes@redhat.com> - 0.4.2-3
- Run tests with bytes warning