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Bug 1180185 - (CVE-2014-3572) CVE-2014-3572 openssl: ECDH downgrade bug fix
CVE-2014-3572 openssl: ECDH downgrade bug fix
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20150105,reported=2...
: Security
Depends On: 1180189 1181015 1181016 1181017 1181018
Blocks: 1180194
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Reported: 2015-01-08 10:18 EST by Vasyl Kaigorodov
Modified: 2016-08-29 17:34 EDT (History)
26 users (show)

See Also:
Fixed In Version: OpenSSL 1.0.1k, OpenSSL 1.0.0p, OpenSSL 0.9.8zd
Doc Type: Bug Fix
Doc Text:
It was discovered that OpenSSL would perform an ECDH key exchange with a non-ephemeral key even when the ephemeral ECDH cipher suite was selected. A malicious server could make a TLS/SSL client using OpenSSL use a weaker key exchange method than the one requested by the user.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0066 normal SHIPPED_LIVE Moderate: openssl security update 2015-01-21 21:28:18 EST

  None (edit)
Description Vasyl Kaigorodov 2015-01-08 10:18:01 EST 
New release of OpenSSL [1] fixes the following bug:

Fix bug where an OpenSSL client would accept a handshake using an ephemeral ECDH ciphersuites with the server key exchange message omitted.

Upstream patches:
- master: https://github.com/openssl/openssl/commit/b15f8769644b00ef7283521593360b7b2135cb63
- 0.9.8: https://github.com/openssl/openssl/commit/e42a2abadc90664e2615dc63ba7f79cf163f780a
- 1.0.1: https://github.com/openssl/openssl/commit/ef28c6d6767a6a30df5add36171894c96628fe98

[1]: https://www.openssl.org/news/changelog.html
Comment 1 Vincent Danen 2015-01-08 13:25:28 EST 
Upstream commit that looks to fix the problem:

https://github.com/openssl/openssl/commit/b15f8769644b00ef7283521593360b7b2135cb63


External References:

https://www.openssl.org/news/secadv_20150108.txt
Comment 3 Tomas Mraz 2015-01-13 12:09:46 EST 
I am not sure whether this affects also the ephemeral DH ciphersuites or not. The patch adds the requirement for ServerKeyExchange message for ephemeral DH as well.
Comment 4 Huzaifa S. Sidhpurwala 2015-01-15 23:12:11 EST 
Statement:

This issue does not affect the version of openssl and openssl097a as shipped with Red Hat Enterprise Linux 5. This issue does not affect the version of openssl098e as shipped with Red Hat Enterprise Linux 6 and 7.
Comment 5 errata-xmlrpc 2015-01-21 16:28:53 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2015:0066 https://rhn.redhat.com/errata/RHSA-2015-0066.html
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