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====================================================================                   
Red Hat Security Advisory

Synopsis:          Moderate: python-cryptography security, bug fix, and enhancement update
Advisory ID:       RHSA-2021:1608-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1608
Issue date:        2021-05-18
CVE Names:         CVE-2020-25659 CVE-2020-36242
====================================================================
1. Summary:

An update for python-cryptography is now available for Red Hat Enterprise
Linux 8.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, ppc64le, s390x, x86_64

3. Description:

The python-cryptography packages contain a Python Cryptographic Authority's
(PyCA's) cryptography library, which provides cryptographic primitives and
recipes to Python developers.

The following packages have been upgraded to a later upstream version:
python-cryptography (3.2.1). (BZ#1873581, BZ#1891947)

Security Fix(es):

* python-cryptography: bleichenbacher timing oracle attack against RSA
decryption (CVE-2020-25659)

* python-cryptography: certain sequences of update() calls when
symmetrically encrypting very large payloads could result in an integer
overflow and lead to buffer overflows (CVE-2020-36242)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.4 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1778939 - internal pyca error with X25519, FIPS
1873581 - Rebase python-cryptography to 2.6+ for ed25519 support
1889988 - CVE-2020-25659 python-cryptography: bleichenbacher timing oracle attack against RSA decryption
1891947 - Rebase internal component python-cryptography-vectors
1907429 - Re-add NPN bindings for PyOpenSSL
1926226 - CVE-2020-36242 python-cryptography: certain sequences of update() calls when symmetrically encrypting very large payloads could result in an integer overflow and lead to buffer overflows

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
python-cryptography-3.2.1-4.el8.src.rpm

aarch64:
python-cryptography-debugsource-3.2.1-4.el8.aarch64.rpm
python3-cryptography-3.2.1-4.el8.aarch64.rpm
python3-cryptography-debuginfo-3.2.1-4.el8.aarch64.rpm

ppc64le:
python-cryptography-debugsource-3.2.1-4.el8.ppc64le.rpm
python3-cryptography-3.2.1-4.el8.ppc64le.rpm
python3-cryptography-debuginfo-3.2.1-4.el8.ppc64le.rpm

s390x:
python-cryptography-debugsource-3.2.1-4.el8.s390x.rpm
python3-cryptography-3.2.1-4.el8.s390x.rpm
python3-cryptography-debuginfo-3.2.1-4.el8.s390x.rpm

x86_64:
python-cryptography-debugsource-3.2.1-4.el8.x86_64.rpm
python3-cryptography-3.2.1-4.el8.x86_64.rpm
python3-cryptography-debuginfo-3.2.1-4.el8.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2020-25659
https://access.redhat.com/security/cve/CVE-2020-36242
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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