OpenSSL Security Advisory

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OpenSSL Security Advisory

openssl
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OpenSSL Security Advisory [02 Nov 2017]
========================================

bn_sqrx8x_internal carry bug on x86_64 (CVE-2017-3736)
======================================================

Severity: Moderate

There is a carry propagating bug in the x86_64 Montgomery squaring procedure. No
EC algorithms are affected. Analysis suggests that attacks against RSA and DSA
as a result of this defect would be very difficult to perform and are not
believed likely. Attacks against DH are considered just feasible (although very
difficult) because most of the work necessary to deduce information
about a private key may be performed offline. The amount of resources
required for such an attack would be very significant and likely only
accessible to a limited number of attackers. An attacker would
additionally need online access to an unpatched system using the target
private key in a scenario with persistent DH parameters and a private
key that is shared between multiple clients.

This only affects processors that support the BMI1, BMI2 and ADX extensions like
Intel Broadwell (5th generation) and later or AMD Ryzen.

Note: This issue is very similar to CVE-2017-3732 and CVE-2015-3193 but must be
treated as a separate problem.

OpenSSL 1.1.0 users should upgrade to 1.1.0g
OpenSSL 1.0.2 users should upgrade to 1.0.2m

This issue was reported to OpenSSL on 10th August 2017 by the OSS-Fuzz project.
The fix was developed by Andy Polyakov of the OpenSSL development team.

Malformed X.509 IPAddressFamily could cause OOB read (CVE-2017-3735)
====================================================================

Severity: Low

This issue was previously announced in security advisory
https://www.openssl.org/news/secadv/20170828.txt, but the fix has not previously
been included in a release due to its low severity.

OpenSSL 1.1.0 users should upgrade to 1.1.0g
OpenSSL 1.0.2 users should upgrade to 1.0.2m


Note
====

Support for version 1.0.1 ended on 31st December 2016. Support for versions
0.9.8 and 1.0.0 ended on 31st December 2015. Those versions are no longer
receiving security updates.

References
==========

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20171102.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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