!16 init python-rsa package for openstack wallaby
From: @liksh Reviewed-by: Signed-off-by:
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@ -1,48 +0,0 @@
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From 93af6f2f89a9bf28361e67716c4240e691520f30 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Sybren=20A=2E=20St=C3=BCvel?= <sybren@stuvel.eu>
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Date: Wed, 3 Jun 2020 14:39:23 +0200
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Subject: [PATCH] Fix CVE-2020-13757: detect cyphertext modifications by
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prepending zero bytes
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Reject cyphertexts that have been modified by prepending zero bytes, by
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checking the cyphertext length against the expected size (given the
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decryption key). This resolves CVE-2020-13757.
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The same approach is used when verifying a signature.
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Thanks Carnil for pointing this out on https://github.com/sybrenstuvel/python-rsa/issues/146
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---
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rsa/pkcs1.py | 9 +++++++++
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1 files changed, 9 insertions(+)
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diff --git a/rsa/pkcs1.py b/rsa/pkcs1.py
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index 28f0dc5..cdf830b 100644
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--- a/rsa/pkcs1.py
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+++ b/rsa/pkcs1.py
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@@ -232,6 +232,12 @@ def decrypt(crypto, priv_key):
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decrypted = priv_key.blinded_decrypt(encrypted)
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cleartext = transform.int2bytes(decrypted, blocksize)
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+ # Detect leading zeroes in the crypto. These are not reflected in the
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+ # encrypted value (as leading zeroes do not influence the value of an
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+ # integer). This fixes CVE-2020-13757.
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+ if len(crypto) > blocksize:
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+ raise DecryptionError('Decryption failed')
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+
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# If we can't find the cleartext marker, decryption failed.
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if cleartext[0:2] != b('\x00\x02'):
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raise DecryptionError('Decryption failed')
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@@ -310,6 +316,9 @@ def verify(message, signature, pub_key):
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cleartext = HASH_ASN1[method_name] + message_hash
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expected = _pad_for_signing(cleartext, keylength)
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+ if len(signature) != keylength:
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+ raise VerificationError('Verification failed')
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+
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# Compare with the signed one
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if expected != clearsig:
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raise VerificationError('Verification failed')
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--
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1.8.3.1
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@ -1,62 +0,0 @@
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From dae8ce0d85478e16f2368b2341632775313d41ed Mon Sep 17 00:00:00 2001
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From: sybrenstuvel <sybren@stuvel.eu>
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Date: Sun, 15 Nov 2020 15:18:38 +0100
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Subject: [PATCH] Fix #165: CVE-2020-25658 - Bleichenbacher-style timing oracle
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Use as many constant-time comparisons as practical in the
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`rsa.pkcs1.decrypt` function.
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`cleartext.index(b'\x00', 2)` will still be non-constant-time. The
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alternative would be to iterate over all the data byte by byte in
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Python, which is several orders of magnitude slower. Given that a
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perfect constant-time implementation is very hard or even impossible to
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do in Python [1], I chose the more performant option here.
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[1]: https://securitypitfalls.wordpress.com/2018/08/03/constant-time-compare-in-python/
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source link:https://github.com/sybrenstuvel/python-rsa/commit/dae8ce0d85478e16f2368b2341632775313d41ed
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Signed-off-by: sybrenstuvel <sybren@stuvel.eu>
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---
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rsa/pkcs1.py | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/rsa/pkcs1.py b/rsa/pkcs1.py
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index cdf830b..7b210a5 100644
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--- a/rsa/pkcs1.py
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+++ b/rsa/pkcs1.py
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@@ -30,6 +30,7 @@ to your users.
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import hashlib
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import os
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+from hmac import compare_digest
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from rsa._compat import b
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from rsa import common, transform, core
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@@ -235,17 +236,20 @@ def decrypt(crypto, priv_key):
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# Detect leading zeroes in the crypto. These are not reflected in the
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# encrypted value (as leading zeroes do not influence the value of an
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# integer). This fixes CVE-2020-13757.
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- if len(crypto) > blocksize:
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- raise DecryptionError('Decryption failed')
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+ crypto_len_bad = len(crypto) > blocksize
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# If we can't find the cleartext marker, decryption failed.
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- if cleartext[0:2] != b('\x00\x02'):
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- raise DecryptionError('Decryption failed')
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+ cleartext_marker_bad = not compare_digest(cleartext[:2], b'\x00\x02')
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# Find the 00 separator between the padding and the message
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try:
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sep_idx = cleartext.index(b('\x00'), 2)
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except ValueError:
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+ sep_idx = -1
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+ sep_idx_bad = sep_idx < 0
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+
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+ anything_bad = crypto_len_bad | cleartext_marker_bad | sep_idx_bad
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+ if anything_bad:
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raise DecryptionError('Decryption failed')
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return cleartext[sep_idx + 1:]
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--
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2.27.0
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@ -1,14 +1,12 @@
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Name: python-rsa
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Version: 3.4.2
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Release: 14
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Version: 4.7.2
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Release: 1
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Summary: Pure-Python RSA implementation
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License: ASL 2.0
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URL: http://stuvel.eu/rsa
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Source0: https://pypi.python.org/packages/source/r/rsa/rsa-%{version}.tar.gz
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BuildArch: noarch
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Patch1: 0001-CVE-2020-13757.patch
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Patch2: 0002-CVE-2020-25658.patch
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%description
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Python-RSA is a pure-Python RSA implementation. It supports
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@ -19,6 +17,7 @@ and key generation according to PKCS#1 version 1.5.
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%{?python_provide:%python_provide python3-rsa}
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Summary: Pure-Python RSA implementation
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BuildRequires: python3-devel, python3-setuptools, python3-pyasn1 >= 0.1.3, python3-unittest2
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BuildRequires: python3-mypy
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Requires: python3-pyasn1 >= 0.1.3, python3-setuptools
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%description -n python3-rsa
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@ -40,8 +39,6 @@ mv $RPM_BUILD_ROOT%{_bindir}/pyrsa-encrypt $RPM_BUILD_ROOT%{_bindir}/pyrsa-encry
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mv $RPM_BUILD_ROOT%{_bindir}/pyrsa-decrypt $RPM_BUILD_ROOT%{_bindir}/pyrsa-decrypt-3
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mv $RPM_BUILD_ROOT%{_bindir}/pyrsa-sign $RPM_BUILD_ROOT%{_bindir}/pyrsa-sign-3
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mv $RPM_BUILD_ROOT%{_bindir}/pyrsa-verify $RPM_BUILD_ROOT%{_bindir}/pyrsa-verify-3
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mv $RPM_BUILD_ROOT%{_bindir}/pyrsa-encrypt-bigfile $RPM_BUILD_ROOT%{_bindir}/pyrsa-encrypt-bigfile-3
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mv $RPM_BUILD_ROOT%{_bindir}/pyrsa-decrypt-bigfile $RPM_BUILD_ROOT%{_bindir}/pyrsa-decrypt-bigfile-3
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%files -n python3-rsa
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%doc README.md
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@ -53,6 +50,9 @@ mv $RPM_BUILD_ROOT%{_bindir}/pyrsa-decrypt-bigfile $RPM_BUILD_ROOT%{_bindir}/pyr
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%{__python3} setup.py test
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%changelog
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* Mon Aug 09 2021 OpenStack_SIG <openstack@openeuler.org> - 4.7.2-1
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- Package update to 4.7.2
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* Tue Dec 15 2020 yanglongkang <yanglongkang@huawei.com> - 3.4.2-14
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- fix CVE-2020-25658
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@ -64,3 +64,4 @@ mv $RPM_BUILD_ROOT%{_bindir}/pyrsa-decrypt-bigfile $RPM_BUILD_ROOT%{_bindir}/pyr
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* Mon Feb 10 2020 Ruijun Ge <geruijun@huawei.com> - 3.4.2-11
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- package init
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@ -2,3 +2,4 @@ version_control: github
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src_repo: sybrenstuevl/python-rsa
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tag_prefix: version-
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seperator: .
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BIN
rsa-3.4.2.tar.gz
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rsa-3.4.2.tar.gz
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BIN
rsa-4.7.2.tar.gz
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BIN
rsa-4.7.2.tar.gz
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