openSUSE Security Update: Security update for openssl
______________________________________________________________________________
Announcement ID: openSUSE-SU-2016:0637-1
Rating: important
References: #957812 #957815 #963415 #968046 #968047 #968048
#968050 #968265 #968374
Cross-References: CVE-2015-1794 CVE-2015-3194 CVE-2015-3195
CVE-2015-3197 CVE-2016-0701 CVE-2016-0702
CVE-2016-0705 CVE-2016-0797 CVE-2016-0798
CVE-2016-0799 CVE-2016-0800
Affected Products:
openSUSE Evergreen 11.4
______________________________________________________________________________
An update that fixes 11 vulnerabilities is now available.
Description:
This update for openssl fixes various security 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.
* 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 migrate to SRP_VBASE_get1_by_user().
– CVE-2016-0799 (bnc#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.
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.
Older issues fixed:
– CVE-2015-1794 follow-up to CVE-2015-1794 (the CVE bug as such doesn’t
affect 1.0.1 but use these patches to prevent potential attacks
– CVE-2015-3195 fix leak with ASN.1 combine (bsc#957812)
– CVE-2015-3194 add PSS parameter check (bsc#957815)
– CVE-2015-3197 better SSLv2 cipher-suite enforcement (bsc#963415)
Patch Instructions:
To install this openSUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product:
– openSUSE Evergreen 11.4:
zypper in -t patch 2016-293=1
To bring your system up-to-date, use “zypper patch”.
Package List:
– openSUSE Evergreen 11.4 (i586 x86_64):
libopenssl-devel-1.0.1p-71.1
libopenssl1_0_0-1.0.1p-71.1
libopenssl1_0_0-debuginfo-1.0.1p-71.1
openssl-1.0.1p-71.1
openssl-debuginfo-1.0.1p-71.1
openssl-debugsource-1.0.1p-71.1
– openSUSE Evergreen 11.4 (x86_64):
libopenssl-devel-32bit-1.0.1p-71.1
libopenssl1_0_0-32bit-1.0.1p-71.1
libopenssl1_0_0-debuginfo-32bit-1.0.1p-71.1
– openSUSE Evergreen 11.4 (noarch):
openssl-doc-1.0.1p-71.1
– openSUSE Evergreen 11.4 (ia64):
libopenssl1_0_0-debuginfo-x86-1.0.1p-71.1
libopenssl1_0_0-x86-1.0.1p-71.1
References:
https://www.suse.com/security/cve/CVE-2015-1794.html
https://www.suse.com/security/cve/CVE-2015-3194.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-2016-0701.html
https://www.suse.com/security/cve/CVE-2016-0702.html
https://www.suse.com/security/cve/CVE-2016-0705.html
https://www.suse.com/security/cve/CVE-2016-0797.html
https://www.suse.com/security/cve/CVE-2016-0798.html
https://www.suse.com/security/cve/CVE-2016-0799.html
https://www.suse.com/security/cve/CVE-2016-0800.html
https://bugzilla.suse.com/957812
https://bugzilla.suse.com/957815
https://bugzilla.suse.com/963415
https://bugzilla.suse.com/968046
https://bugzilla.suse.com/968047
https://bugzilla.suse.com/968048
https://bugzilla.suse.com/968050
https://bugzilla.suse.com/968265
https://bugzilla.suse.com/968374
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