A padding oracle flaw was found in the Secure Sockets Layer version 2.0 (SSLv2) protocol. An attacker can 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)

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)

For the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.

This update for openssl fixes various security issues and bugs :

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-2016-0705 (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-2016-0799 (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 fixes the following bug :

  - Avoid running OPENSSL_config twice. This avoids breaking     engine loading and also fixes a memory leak in libssl.
    (bsc#952871 bsc#967787)

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.

This update for compat-openssl097g fixes the following issues :

  - 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-2016-0705 (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-2016-0799 (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-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-2016-0705 (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-2016-0799 (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.

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.

A padding oracle flaw was found in the Secure Sockets Layer version 2.0 (SSLv2) protocol. An attacker can 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). Prior to this advisory, SSLv2 has been disabled by default in OpenSSL on the Amazon Linux AMI. However, application configurations may still re-enable SSLv2.

A flaw was found in the way TLS 1.2 could use the MD5 hash function for signing ServerKeyExchange and Client Authentication packets during a TLS handshake. A man-in-the-middle attacker able to force a TLS connection to use the MD5 hash function could use this flaw to conduct collision attacks to impersonate a TLS server or an authenticated TLS client. (CVE-2015-7575 , Medium)

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 , Low)

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 , Low)

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 , Low)

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 , Low)

The fmtstr function in crypto/bio/b_print.c in OpenSSL improperly calculated string lengths, which allows remote attackers to cause a denial of service (overflow and out-of-bounds read) or possibly have unspecified other impact via a long string, as demonstrated by a large amount of ASN.1 data. (CVE-2016-0799 , Low)

The doapr_outch function in crypto/bio/b_print.c in OpenSSL did not verify that a certain memory allocation succeeds, which allows remote attackers to cause a denial of service (out-of-bounds write or memory consumption) or possibly have unspecified other impact via a long string, as demonstrated by a large amount of ASN.1 data.
(CVE-2016-2842 , Low)

'(Updated on 2016-04-28: CVE-2016-2842 was fixed as part of this update but was previously not listed in this advisory.)'

The version of MySQL running on the remote host is 5.6.x prior to 5.6.30. It is, therefore, affected by multiple 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 an authenticated, remote attacker to impact     integrity and availability. (CVE-2016-0642)

  - An unspecified flaw exists in the DML subcomponent that     allows an authenticated, remote attacker to disclose     sensitive information. (CVE-2016-0643)

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

  - An unspecified flaw exists in the PS subcomponent that     allows an authenticated, remote attacker to cause a     denial of service condition. (CVE-2016-0647)

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

  - An unspecified flaw exists in the Security: Privileges     subcomponent that allows an authenticated, remote     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)

  - A flaw exists related to certificate validation due to     the server hostname not being verified to match a domain     name in 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 data.

  - An integer overflow condition exists that is triggered     due to improper validation of user-supplied input when     processing client handshakes. An authenticated, remote     attacker can exploit this to cause the server to exit,     resulting in a denial of service condition.

  - An information disclosure vulnerability exists due to     overly verbose error messages returning part of the SQL     statement that produced them. An authenticated, remote     attacker can exploit this to disclose sensitive     information.

According to its self-reported version number, the remote pfSense install is prior to 2.3. It is, therefore, affected by multiple vulnerabilities.

ID	Name	Product	Family	Published	Updated	Severity
89075	Scientific Linux Security Update : openssl on SL6.x, SL7.x i386/x86_64 (20160301) (DROWN)	Nessus	Scientific Linux Local Security Checks	3/2/2016	1/14/2021	critical
89655	SUSE SLED11 / SLES11 Security Update : openssl (SUSE-SU-2016:0624-1) (DROWN)	Nessus	SuSE Local Security Checks	3/4/2016	1/6/2021	critical
89722	SUSE SLED11 Security Update : compat-openssl097g (SUSE-SU-2016:0631-1) (DROWN)	Nessus	SuSE Local Security Checks	3/7/2016	1/6/2021	critical
89842	Amazon Linux AMI : openssl (ALAS-2016-661) (DROWN) (SLOTH)	Nessus	Amazon Linux Local Security Checks	3/11/2016	7/10/2019	critical
90683	MySQL 5.6.x < 5.6.30 Multiple Vulnerabilities (DROWN)	Nessus	Databases	4/22/2016	11/20/2019	critical
106499	pfSense < 2.3 Multiple Vulnerabilities (SA-16_01 - SA-16_02)	Nessus	Firewalls	1/31/2018	10/30/2025	critical

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