Issued:
2016-03-01
Updated:
2016-03-01

RHSA-2016:0306 - Security Advisory

Synopsis

Important: openssl security update

Type/Severity

Security Advisory: Important

Topic

Updated openssl packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 4 Extended Lifecycle Support.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

Description

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols, as well as a
full-strength, general purpose cryptography library.

A padding oracle flaw was found in the Secure Sockets Layer version 2.0
(SSLv2) protocol. An attacker can potentially use this flaw to decrypt
RSA-encrypted cipher text from a connection using a newer SSL/TLS protocol
version, allowing them to decrypt such connections. This cross-protocol
attack is publicly referred to as DROWN. (CVE-2016-0800)

Note: This issue was addressed by disabling the SSLv2 protocol by default
when using the 'SSLv23' connection methods, and removing support for weak
SSLv2 cipher suites. It is possible to re-enable the SSLv2 protocol in the
'SSLv23' connection methods by default by setting the OPENSSL_ENABLE_SSL2
environment variable before starting an application that needs to have
SSLv2 enabled. For more information, refer to the knowledge base article
linked to in the References section.

It was discovered that the SSLv2 servers using OpenSSL accepted SSLv2
connection handshakes that indicated non-zero clear key length for
non-export cipher suites. An attacker could use this flaw to decrypt
recorded SSLv2 sessions with the server by using it as a decryption
oracle.(CVE-2016-0703)

It was discovered that the SSLv2 protocol implementation in OpenSSL did
not properly implement the Bleichenbacher protection for export cipher
suites. An attacker could use a SSLv2 server using OpenSSL as a
Bleichenbacher oracle. (CVE-2016-0704)

Note: The CVE-2016-0703 and CVE-2016-0704 issues could allow for more
efficient exploitation of the CVE-2016-0800 issue via the DROWN attack.

A denial of service flaw was found in the way OpenSSL handled SSLv2
handshake messages. A remote attacker could use this flaw to cause a
TLS/SSL server using OpenSSL to exit on a failed assertion if it had both
the SSLv2 protocol and EXPORT-grade cipher suites enabled. (CVE-2015-0293)

A flaw was found in the way malicious SSLv2 clients could negotiate SSLv2
ciphers that have been disabled on the server. This could result in weak
SSLv2 ciphers being used for SSLv2 connections, making them vulnerable to
man-in-the-middle attacks. (CVE-2015-3197)

Red Hat would like to thank the OpenSSL project for reporting these issues.
Upstream acknowledges Nimrod Aviram and Sebastian Schinzel as the original
reporters of CVE-2016-0800 and CVE-2015-3197; David Adrian (University of
Michigan) and J. Alex Halderman (University of Michigan) as the original
reporters of CVE-2016-0703 and CVE-2016-0704; and Sean Burford (Google) and
Emilia Kasper (OpenSSL development team) as the original reporters of
CVE-2015-0293.

All openssl users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. For the update to take
effect, all services linked to the OpenSSL library must be restarted, or
the system rebooted.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

Affected Products

  • Red Hat Enterprise Linux Server - Extended Life Cycle Support 4 x86_64
  • Red Hat Enterprise Linux Server - Extended Life Cycle Support 4 ia64
  • Red Hat Enterprise Linux Server - Extended Life Cycle Support 4 i386

Fixes

  • BZ - 1202404 - CVE-2015-0293 openssl: assertion failure in SSLv2 servers
  • BZ - 1301846 - CVE-2015-3197 OpenSSL: SSLv2 doesn't block disabled ciphers
  • BZ - 1310593 - CVE-2016-0800 SSL/TLS: Cross-protocol attack on TLS using SSLv2 (DROWN)
  • BZ - 1310811 - CVE-2016-0703 openssl: Divide-and-conquer session key recovery in SSLv2
  • BZ - 1310814 - CVE-2016-0704 openssl: SSLv2 Bleichenbacher protection overwrites wrong bytes for export ciphers

CVEs

References

Red Hat Enterprise Linux Server - Extended Life Cycle Support 4

SRPM
openssl-0.9.7a-43.23.el4.src.rpm SHA-256: c9d58f4a79f0a62db1496d59d09279a1d73b876bb0e1437b0ae60a2f41da6e1e
x86_64
openssl-0.9.7a-43.23.el4.i686.rpm SHA-256: e933f4c26936e3cde1736f4d198790e5d1686dca3538b648d435b8bb7669369c
openssl-0.9.7a-43.23.el4.i686.rpm SHA-256: e933f4c26936e3cde1736f4d198790e5d1686dca3538b648d435b8bb7669369c
openssl-0.9.7a-43.23.el4.x86_64.rpm SHA-256: 091599000043a26a4d187da65409d4855425f170afb5f1d0741a332f2abaa63d
openssl-0.9.7a-43.23.el4.x86_64.rpm SHA-256: 091599000043a26a4d187da65409d4855425f170afb5f1d0741a332f2abaa63d
openssl-devel-0.9.7a-43.23.el4.i386.rpm SHA-256: f5ef7dcbfc890372df43615d1cc7f623b8603ed07021a3a31203eb39c5025a55
openssl-devel-0.9.7a-43.23.el4.i386.rpm SHA-256: f5ef7dcbfc890372df43615d1cc7f623b8603ed07021a3a31203eb39c5025a55
openssl-devel-0.9.7a-43.23.el4.x86_64.rpm SHA-256: 40e8c4450909ddd8a6cc01623910c6e61829dd5691fa94c623ced893efbefd2b
openssl-devel-0.9.7a-43.23.el4.x86_64.rpm SHA-256: 40e8c4450909ddd8a6cc01623910c6e61829dd5691fa94c623ced893efbefd2b
openssl-perl-0.9.7a-43.23.el4.x86_64.rpm SHA-256: 79f6fd4537aab524f63497cb0d0bf1e8044d9cbc1f9fb8e4f3e877b249d5b7aa
openssl-perl-0.9.7a-43.23.el4.x86_64.rpm SHA-256: 79f6fd4537aab524f63497cb0d0bf1e8044d9cbc1f9fb8e4f3e877b249d5b7aa
ia64
openssl-0.9.7a-43.23.el4.i686.rpm SHA-256: e933f4c26936e3cde1736f4d198790e5d1686dca3538b648d435b8bb7669369c
openssl-0.9.7a-43.23.el4.ia64.rpm SHA-256: 579ce48920bed4bf72366a8349aaf8d4d61ed189d524e8b5fb33bbe5eed595d1
openssl-devel-0.9.7a-43.23.el4.ia64.rpm SHA-256: c91c45202d2c604045df293ee7eec7d30d1f2a8b6863eb0d0854e1a458349a04
openssl-perl-0.9.7a-43.23.el4.ia64.rpm SHA-256: 72f6d341ec3786cdb7239171b12000d24b5226606da26bc79f0c2b1eecae1d39
i386
openssl-0.9.7a-43.23.el4.i386.rpm SHA-256: e1a9ce8d28eecb9d0797e9049977d725b5812522d5e41cadaa497d61c07317ac
openssl-0.9.7a-43.23.el4.i386.rpm SHA-256: e1a9ce8d28eecb9d0797e9049977d725b5812522d5e41cadaa497d61c07317ac
openssl-0.9.7a-43.23.el4.i686.rpm SHA-256: e933f4c26936e3cde1736f4d198790e5d1686dca3538b648d435b8bb7669369c
openssl-0.9.7a-43.23.el4.i686.rpm SHA-256: e933f4c26936e3cde1736f4d198790e5d1686dca3538b648d435b8bb7669369c
openssl-devel-0.9.7a-43.23.el4.i386.rpm SHA-256: f5ef7dcbfc890372df43615d1cc7f623b8603ed07021a3a31203eb39c5025a55
openssl-devel-0.9.7a-43.23.el4.i386.rpm SHA-256: f5ef7dcbfc890372df43615d1cc7f623b8603ed07021a3a31203eb39c5025a55
openssl-perl-0.9.7a-43.23.el4.i386.rpm SHA-256: f81c6f2718cc2e4a4421f4e160b9d3886bf4fc7f8a1718f8b64eb03409b64f4f
openssl-perl-0.9.7a-43.23.el4.i386.rpm SHA-256: f81c6f2718cc2e4a4421f4e160b9d3886bf4fc7f8a1718f8b64eb03409b64f4f

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