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.

Also the following bug was fixed :

  - Ensure that OpenSSL doesn't fall back to the default     digest algorithm (SHA1) in case a non-FIPS algorithm was     negotiated while running in FIPS mode. Instead, OpenSSL     will refuse the session. (bnc#958501)

This update was imported from the SUSE:SLE-12-SP1:Update update project.

An updated rhev-hypervisor package that fixes several security issues, bugs, and enhancements is now available.

Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The rhev-hypervisor package provides a Red Hat Enterprise Virtualization Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes everything necessary to run and manage virtual machines: a subset of the Red Hat Enterprise Linux operating environment and the Red Hat Enterprise Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available for the Intel 64 and AMD64 architectures with virtualization extensions.

A padding oracle flaw was found in the Secure Sockets Layer version 2.0 (SSLv2) protocol. An attacker could 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. For more information, refer to the knowledge base article linked in the References section.

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)

A side-channel attack was found that makes use of cache-bank conflicts on the Intel Sandy-Bridge microarchitecture. An attacker who has the ability to control code in a thread running on the same hyper-threaded core as the victim's thread that is performing decryption, could use this flaw to recover RSA private keys. (CVE-2016-0702)

A double-free flaw was found in the way OpenSSL parsed certain malformed DSA (Digital Signature Algorithm) private keys. An attacker could create specially crafted DSA private keys that, when processed by an application compiled against OpenSSL, could cause the application to crash. (CVE-2016-0705)

An integer overflow flaw, leading to a NULL pointer dereference or a heap-based memory corruption, was found in the way some BIGNUM functions of OpenSSL were implemented. Applications that use these functions with large untrusted input could crash or, potentially, execute arbitrary code. (CVE-2016-0797)

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; Yuval Yarom (University of Adelaide and NICTA), Daniel Genkin (Technion and Tel Aviv University), Nadia Heninger (University of Pennsylvania) as the original reporters of CVE-2016-0702; Adam Langley (Google/ BoringSSL) as the original reporter of CVE-2016-0705; and Guido Vranken as the original reporter of CVE-2016-0797.

All openssl users are advised to upgrade to this updated package, 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.

Changes to the rhev-hypervisor component :

* Previously, a race between services during boot prevented network configuration from upgrading correctly. The risk for the race has now been reduced significantly to allow the upgrade of the network configuration to complete correctly. (BZ#1194068)

* Previously, using the text user interface (TUI) to log in to the administrator account of Red Hat Enterprise Virtualization Hypervisor failed with a Python backtrace. This update makes the 'six' module correctly importable under all circumstances, which ensures that logging in to Red Hat Enterprise Virtualization Hypervisor using TUI proceeds as expected. (BZ#1246836)

The version of Oracle MySQL installed on the remote host is 5.6.x prior to 5.6.30. It is, therefore, affected by the following vulnerabilities :

  - A cipher algorithm downgrade vulnerability exists in the     bundled version of OpenSSL due to a flaw that is     triggered when handling cipher negotiation. A remote     attacker can exploit this to negotiate SSLv2 ciphers and     complete SSLv2 handshakes even if all SSLv2 ciphers have     been disabled on the server. Note that this     vulnerability only exists if the SSL_OP_NO_SSLv2 option     has not been disabled. (CVE-2015-3197)

  - An unspecified flaw exists in the Pluggable     Authentication subcomponent that allows an     unauthenticated, remote attacker to execute arbitrary     code. (CVE-2016-0639)

  - An unspecified flaw exists in the Federated subcomponent     that allows a local attacker to impact integrity and     availability. (CVE-2016-0642)

  - An unspecified flaw exists in the DML subcomponent that     allows a local attacker to disclose potentially     sensitive information. (CVE-2016-0643)

  - An unspecified flaw exists in the FTS subcomponent that     allows a local attacker to cause a denial of service     condition. (CVE-2016-0647)

  - An unspecified flaw exists in the PS subcomponent that     allows a local attacker to cause a denial of service     condition. (CVE-2016-0648)

  - An unspecified flaw exists in the InnoDB subcomponent     that allows a local attacker to cause a denial of     service condition. (CVE-2016-0655)

  - An unspecified flaw exists in the Security: Privileges     subcomponent that allows a local attacker to cause a     denial of service condition. (CVE-2016-0666)

  - A key disclosure vulnerability exists in the bundled     version of OpenSSL due to improper handling of     cache-bank conflicts on the Intel Sandy-bridge     microarchitecture. An attacker can exploit this to gain     access to RSA key information. (CVE-2016-0702)

  - A double-free error exists in the bundled version of     OpenSSL due to improper validation of user-supplied     input when parsing malformed DSA private keys. A remote     attacker can exploit this to corrupt memory, resulting     in a denial of service condition or the execution of     arbitrary code. (CVE-2016-0705)

  - A NULL pointer dereference flaw exists in the bundled     version of OpenSSL in the BN_hex2bn() and BN_dec2bn()     functions. A remote attacker can exploit this to trigger     a heap corruption, resulting in the execution of     arbitrary code. (CVE-2016-0797)

  - A denial of service vulnerability exists in the bundled     version of OpenSSL due to improper handling of invalid     usernames. A remote attacker can exploit this, via a     specially crafted username, to leak 300 bytes of memory     per connection, exhausting available memory resources.
    (CVE-2016-0798)

  - Multiple memory corruption issues exist in the bundled     version of OpenSSL that allow a remote attacker to cause     a denial of service condition or the execution of     arbitrary code. (CVE-2016-0799)

  - A flaw exists in the bundled version of OpenSSL that     allows a cross-protocol Bleichenbacher padding oracle     attack known as DROWN (Decrypting RSA with Obsolete and     Weakened eNcryption). This vulnerability exists due to a     flaw in the Secure Sockets Layer Version 2 (SSLv2)     implementation, and it allows captured TLS traffic to be     decrypted. A man-in-the-middle attacker can exploit this     to decrypt the TLS connection by utilizing previously     captured traffic and weak cryptography along with a     series of specially crafted connections to an SSLv2     server that uses the same private key. (CVE-2016-0800)

  - A man-in-the-middle spoofing vulnerability exists due to     the server hostname not being verified to match a domain     name in the Subject's Common Name (CN) or SubjectAltName     field of the X.509 certificate. A man-in-the-middle     attacker can exploit this, by spoofing the TLS/SSL     server via a certificate that appears valid, to disclose     sensitive information or manipulate transmitted data.
    (CVE-2016-2047)

  - An unspecified flaw exists in the Security: Encryption     subcomponent that allows an unauthenticated, remote     attacker to disclose potentially sensitive information.
    (CVE-2016-3452)

  - An unspecified flaw exists in the Connection     subcomponent that allows an unauthenticated, remote     attacker to disclose potentially sensitive information.
    (CVE-2016-5444)

The version of Oracle MySQL installed on the remote host is 5.7.x prior to 5.7.12. It is, therefore, affected by the following vulnerabilities :

  - A cipher algorithm downgrade vulnerability exists in the     bundled version of OpenSSL due to a flaw that is     triggered when handling cipher negotiation. A remote     attacker can exploit this to negotiate SSLv2 ciphers and     complete SSLv2 handshakes even if all SSLv2 ciphers have     been disabled on the server. Note that this     vulnerability only exists if the SSL_OP_NO_SSLv2 option     has not been disabled. (CVE-2015-3197)

  - An unspecified flaw exists in the Pluggable     Authentication subcomponent that allows an     unauthenticated, remote attacker to execute arbitrary     code. (CVE-2016-0639)

  - An unspecified flaw exists in the Federated subcomponent     that allows a local attacker to impact integrity and     availability. (CVE-2016-0642)

  - An unspecified flaw exists in the DML subcomponent that     allows a local attacker to disclose potentially     sensitive information. (CVE-2016-0643)

  - An unspecified flaw exists in the FTS subcomponent that     allows a local attacker to cause a denial of service     condition. (CVE-2016-0647)

  - An unspecified flaw exists in the PS subcomponent that     allows a local attacker to cause a denial of service     condition. (CVE-2016-0648)

  - An unspecified flaw exists in the InnoDB subcomponent     that allows a local attacker to cause a denial of     service condition. (CVE-2016-0655)

  - An unspecified flaw exists in the JSON subcomponent that     allows a local attacker to disclose potentially     sensitive information. (CVE-2016-0657)

  - An unspecified flaw exists in the Optimizer subcomponent     that allows a local attacker to cause a denial of     service condition. (CVE-2016-0659)

  - An unspecified flaw exists in the Partition subcomponent     that allows a local attacker to cause a denial of     service condition. (CVE-2016-0662)

  - An unspecified flaw exists in the Security: Privileges     subcomponent that allows a local attacker to cause a     denial of service condition. (CVE-2016-0666)

  - An unspecified flaw exists in the Locking subcomponent     that allows a local attacker to cause a denial of     service condition. (CVE-2016-0667)

  - A key disclosure vulnerability exists in the bundled     version of OpenSSL due to improper handling of     cache-bank conflicts on the Intel Sandy-bridge     microarchitecture. An attacker can exploit this to gain     access to RSA key information. (CVE-2016-0702)

  - A double-free error exists in the bundled version of     OpenSSL due to improper validation of user-supplied     input when parsing malformed DSA private keys. A remote     attacker can exploit this to corrupt memory, resulting     in a denial of service condition or the execution of     arbitrary code. (CVE-2016-0705)

  - A NULL pointer dereference flaw exists in the bundled     version of OpenSSL in the BN_hex2bn() and BN_dec2bn()     functions. A remote attacker can exploit this to trigger     a heap corruption, resulting in the execution of     arbitrary code. (CVE-2016-0797)

  - A denial of service vulnerability exists in the bundled     version of OpenSSL due to improper handling of invalid     usernames. A remote attacker can exploit this, via a     specially crafted username, to leak 300 bytes of memory     per connection, exhausting available memory resources.
    (CVE-2016-0798)

  - Multiple memory corruption issues exist in the bundled     version of OpenSSL that allow a remote attacker to cause     a denial of service condition or the execution of     arbitrary code. (CVE-2016-0799)

  - A flaw exists in the bundled version of OpenSSL that     allows a cross-protocol Bleichenbacher padding oracle     attack known as DROWN (Decrypting RSA with Obsolete and     Weakened eNcryption). This vulnerability exists due to a     flaw in the Secure Sockets Layer Version 2 (SSLv2)     implementation, and it allows captured TLS traffic to be     decrypted. A man-in-the-middle attacker can exploit this     to decrypt the TLS connection by utilizing previously     captured traffic and weak cryptography along with a     series of specially crafted connections to an SSLv2     server that uses the same private key. (CVE-2016-0800)

  - A man-in-the-middle spoofing vulnerability exists due to     the server hostname not being verified to match a domain     name in the Subject's Common Name (CN) or SubjectAltName     field of the X.509 certificate. A man-in-the-middle     attacker can exploit this, by spoofing the TLS/SSL     server via a certificate that appears valid, to disclose     sensitive information or manipulate transmitted data.
    (CVE-2016-2047)

  - An unspecified flaw exists in the Optimizer subcomponent     that allow an authenticated, remote attacker to cause a     denial of service condition. (CVE-2016-3440,     CVE-2017-10378)

  - An unspecified flaw exists in the Connection     subcomponent that allows an unauthenticated, remote     attacker to disclose potentially sensitive information.
    (CVE-2016-5444)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for libressl to version 2.5.1 fixes the following issues :

These security issues were fixed :

  - CVE-2016-0702: Prevent side channel attack on modular     exponentiation (boo#968050).

  - CVE-2016-7056: Avoid a side-channel cache-timing attack     that can leak the ECDSA private keys when signing     (boo#1019334).

These non-security issues were fixed :

  - Detect zero-length encrypted session data early

  - Curve25519 Key Exchange support.

  - Support for alternate chains for certificate     verification.

  - Added EVP interface for MD5+SHA1 hashes

  - Fixed DTLS client failures when the server sends a     certificate request.

  - Corrected handling of padding when upgrading an SSLv2     challenge into an SSLv3/TLS connection. 

  - Allowed protocols and ciphers to be set on a TLS config     object in libtls.

For additional changes please refer to the changelog.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
89091	openSUSE Security Update : openssl (openSUSE-2016-289) (DROWN)	Nessus	SuSE Local Security Checks	2016/3/3	2021/1/19	critical
89819	RHEL 6 : rhev-hypervisor (RHSA-2016:0379) (DROWN)	Nessus	Red Hat Local Security Checks	2016/3/10	2019/10/24	critical
90832	Oracle MySQL 5.6.x < 5.6.30 Multiple Vulnerabilities (April 2016 CPU) (July 2016 CPU) (DROWN)	Nessus	Databases	2016/5/2	2020/6/3	critical
90834	Oracle MySQL 5.7.x < 5.7.12 Multiple Vulnerabilities (RPM Check) (April 2016 CPU) (July 2016 CPU) (October 2017 CPU) (DROWN)	Nessus	Databases	2016/5/2	2020/6/3	critical
100043	openSUSE Security Update : libressl (openSUSE-2017-561)	Nessus	SuSE Local Security Checks	2017/5/9	2025/12/19	medium

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