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Bug 1180239 - (CVE-2015-0205) CVE-2015-0205 openssl: DH client certificates accepted without verification
CVE-2015-0205 openssl: DH client certificates accepted without verification
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=20150108,reported=2...
: Security
Depends On: 1181013 1181015 1181016 1181017 1181018
Blocks: 1180194
  Show dependency tree / graph
 
Reported: 2015-01-08 11:57 EST by Vasyl Kaigorodov
Modified: 2015-11-30 12:06 EST (History)
27 users (show)

See Also:
Fixed In Version: OpenSSL 1.0.1k, OpenSSL 1.0.0p
Doc Type: Bug Fix
Doc Text:
It was found that an OpenSSL server would, under certain conditions, accept Diffie-Hellman client certificates without the use of a private key. An attacker could use a user's client certificate to authenticate as that user, without needing the private key.
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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 11:57:47 EST 
OpenSSL released security advisory [1] which fixes the below issue:

An OpenSSL server will accept a DH certificate for client authentication
without the certificate verify message. This effectively allows a client
to authenticate without the use of a private key. This only affects servers
which trust a client certificate authority which issues certificates
containing DH keys: these are extremely rare and hardly ever encountered.

[1]: https://www.openssl.org/news/secadv_20150108.txt
Comment 1 Vincent Danen 2015-01-08 13:33:44 EST 
Upstream commit that looks to fix the problem:

https://github.com/openssl/openssl/commit/1421e0c584ae9120ca1b88098f13d6d2e90b83a3


External References:

https://www.openssl.org/news/secadv_20150108.txt
Comment 2 Huzaifa S. Sidhpurwala 2015-01-12 03:29:46 EST 
Created openssl tracking bugs for this issue:

Affects: fedora-all [bug 1181013]
Comment 4 Fedora Update System 2015-01-12 19:02:36 EST 
openssl-1.0.1k-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 5 Huzaifa S. Sidhpurwala 2015-01-15 23:15:04 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 6 Fedora Update System 2015-01-20 16:06:01 EST 
openssl-1.0.1e-41.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 errata-xmlrpc 2015-01-21 16:29:11 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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