SUSE SLES10 Security Update : OpenSSL (SUSE-SU-2016:0678-1) (DROWN)

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


Synopsis :

The remote SUSE host is missing one or more security updates.

Description :

OpenSSL was update to fix security issues and bugs :

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.

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

CVE-2016-0797 (bsc#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-2016-0799 (bsc#968374): On many 64 bit systems, the internal
fmtstr() and doapr_outch() functions could miscalculate the length of
a string and attempt to access out-of-bounds memory locations. These
problems could have enabled attacks where large amounts of untrusted
data is passed to the BIO_*printf functions. If applications use these
functions in this way then they could have been vulnerable. OpenSSL
itself uses these functions when printing out human-readable dumps of
ASN.1 data. Therefore applications that print this data could have
been vulnerable if the data is from untrusted sources. OpenSSL command
line applications could also have been vulnerable when they print out
ASN.1 data, or if untrusted data is passed as command line arguments.
Libssl is not considered directly vulnerable.

CVE-2015-3197 (bsc#963415): The SSLv2 protocol did not block disabled
ciphers.

CVE-2015-3195 (bsc#957812): An X509_ATTRIBUTE memory leak was fixed.

Fixed a regression caused by the openssl-CVE-2015-0287.patch
(bsc#937492)

Note that the March 1st 2016 release also references following CVEs
that were fixed by us with CVE-2015-0293 in 2015 :

CVE-2016-0703 (bsc#968051): This issue only affected versions of
OpenSSL prior to March 19th 2015 at which time the code was refactored
to address vulnerability CVE-2015-0293. It would have made the above
'DROWN' attack much easier.

CVE-2016-0704 (bsc#968053): 'Bleichenbacher oracle in SSLv2' This
issue only affected versions of OpenSSL prior to March 19th 2015 at
which time the code was refactored to address vulnerability
CVE-2015-0293. It would have made the above 'DROWN' attack much
easier.

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

See also :

https://bugzilla.suse.com/937492
https://bugzilla.suse.com/957812
https://bugzilla.suse.com/963415
https://bugzilla.suse.com/968046
https://bugzilla.suse.com/968048
https://bugzilla.suse.com/968051
https://bugzilla.suse.com/968053
https://bugzilla.suse.com/968374
http://www.nessus.org/u?f5289575
https://www.suse.com/security/cve/CVE-2015-0287.html
https://www.suse.com/security/cve/CVE-2015-3195.html
https://www.suse.com/security/cve/CVE-2015-3197.html
https://www.suse.com/security/cve/CVE-2016-0703.html
https://www.suse.com/security/cve/CVE-2016-0704.html
https://www.suse.com/security/cve/CVE-2016-0797.html
https://www.suse.com/security/cve/CVE-2016-0799.html
https://www.suse.com/security/cve/CVE-2016-0800.html
http://www.nessus.org/u?b751cc52

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)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: SuSE Local Security Checks

Nessus Plugin ID: 89731 ()

Bugtraq ID: 73227
73232

CVE ID: CVE-2015-0287
CVE-2015-0293
CVE-2015-3195
CVE-2015-3197
CVE-2016-0703
CVE-2016-0704
CVE-2016-0797
CVE-2016-0799
CVE-2016-0800

Ready to Amp Up Your Nessus Experience?

Get Nessus Professional to scan unlimited IPs, run compliance checks & more

Buy Nessus Professional Now