openSUSE Security Update : openssl (openSUSE-2016-288) (DROWN)

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote openSUSE host is missing a security update.

Description :

This update for openssl fixes the following issues :

Security issues fixed :

- CVE-2016-0800 aka the 'DROWN' attack (bsc#968046):
OpenSSL was vulnerable to a cross-protocol attack that
could lead to decryption of TLS sessions by using a
server supporting SSLv2 and EXPORT cipher suites as a
Bleichenbacher RSA padding oracle.

This update changes the openssl library to :

- Disable SSLv2 protocol support by default.

This can be overridden by setting the environment
variable 'OPENSSL_ALLOW_SSL2' or by using
SSL_CTX_clear_options using the SSL_OP_NO_SSLv2 flag.

Note that various services and clients had already
disabled SSL protocol 2 by default previously.

Please also note that we built the 13.2 openSUSE openssl
already with 'no-ssl2'.

- Disable all weak EXPORT ciphers by default. These can be
reenabled if required by old legacy software using the
environment variable 'OPENSSL_ALLOW_EXPORT'.

- CVE-2016-0702 aka the 'CacheBleed' attack. (bsc#968050)
Various changes in the modular exponentation code were
added that make sure that it is not possible to recover
RSA secret keys by analyzing cache-bank conflicts on the
Intel Sandy-Bridge microarchitecture.

Note that this was only exploitable if the malicious
code was running on the same hyper threaded Intel Sandy
Bridge processor as the victim thread performing
decryptions.

- CVE-2016-0705 (bnc#968047): A double free() bug in the
DSA ASN1 parser code was fixed that could be abused to
facilitate a denial-of-service attack.

- CVE-2016-0797 (bnc#968048): The BN_hex2bn() and
BN_dec2bn() functions had a bug that could result in an
attempt to de-reference a NULL pointer leading to
crashes. This could have security consequences if these
functions were ever called by user applications with
large untrusted hex/decimal data. Also, internal usage
of these functions in OpenSSL uses data from config
files or application command line arguments. If user
developed applications generated config file data based
on untrusted data, then this could have had security
consequences as well.

- CVE-2016-0798 (bnc#968265) The SRP user database lookup
method SRP_VBASE_get_by_user() had a memory leak that
attackers could abuse to facility DoS attacks. To
mitigate the issue, the seed handling in
SRP_VBASE_get_by_user() was disabled even if the user
has configured a seed. Applications are advised to

- We're unaffected by CVE-2016-0799 (boo#968374) because
we use glibc's printf implementation instead of the
built in one

Bugs fixed :

- avoid running OPENSSL_config twice. This avoids breaking
engine loading. (boo#952871)

See also :

https://bugzilla.opensuse.org/show_bug.cgi?id=952871
https://bugzilla.opensuse.org/show_bug.cgi?id=968046
https://bugzilla.opensuse.org/show_bug.cgi?id=968047
https://bugzilla.opensuse.org/show_bug.cgi?id=968048
https://bugzilla.opensuse.org/show_bug.cgi?id=968050
https://bugzilla.opensuse.org/show_bug.cgi?id=968265
https://bugzilla.opensuse.org/show_bug.cgi?id=968374

Solution :

Update the affected openssl packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)

Family: SuSE Local Security Checks

Nessus Plugin ID: 89090 ()

Bugtraq ID:

CVE ID: CVE-2016-0702
CVE-2016-0705
CVE-2016-0797
CVE-2016-0798
CVE-2016-0799
CVE-2016-0800

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