[security-announce] SUSE-SU-2016:0678-1: important: Security update for OpenSSL

[news 28]

SUSE Security Update: Security update for OpenSSL

______________________________________________________________________________

 

Announcement ID: SUSE-SU-2016:0678-1

Rating: important

References: #937492 #957812 #963415 #968046 #968048 #968051

#968053 #968374

Cross-References: CVE-2015-0287 CVE-2015-3195 CVE-2015-3197

CVE-2016-0703 CVE-2016-0704 CVE-2016-0797

CVE-2016-0799 CVE-2016-0800

Affected Products:

SUSE Linux Enterprise Server 10 SP4 LTSS

______________________________________________________________________________

 

An update that fixes 8 vulnerabilities is now available.

 

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:

 

o 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.

o 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.

 

Security Issues:

 

* CVE-2015-0287

 

* CVE-2015-3195

 

* CVE-2015-3197

 

* CVE-2016-0703

 

* CVE-2016-0704

 

* CVE-2016-0797

 

* CVE-2016-0799

 

* CVE-2016-0800

 

 

 

 

Package List:

 

- SUSE Linux Enterprise Server 10 SP4 LTSS (i586 s390x x86_64):

 

openssl-0.9.8a-18.94.2

openssl-devel-0.9.8a-18.94.2

openssl-doc-0.9.8a-18.94.2

 

- SUSE Linux Enterprise Server 10 SP4 LTSS (s390x x86_64):

 

openssl-32bit-0.9.8a-18.94.2

openssl-devel-32bit-0.9.8a-18.94.2

 

 

References:

 

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

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

https://download.suse.com/patch/finder/?keywords=5965d0982b34e01de9e5c15991f88378

 

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