Security Fix(es) :

  - A memory leak flaw was found in the way OpenSSL handled     TLS status request extension data during session     renegotiation. A remote attacker could cause a TLS     server using OpenSSL to consume an excessive amount of     memory and, possibly, exit unexpectedly after exhausting     all available memory, if it enabled OCSP stapling     support. (CVE-2016-6304)

  - It was discovered that OpenSSL did not always use     constant time operations when computing Digital     Signature Algorithm (DSA) signatures. A local attacker     could possibly use this flaw to obtain a private DSA key     belonging to another user or service running on the same     system. (CVE-2016-2178)

  - It was discovered that the Datagram TLS (DTLS)     implementation could fail to release memory in certain     cases. A malicious DTLS client could cause a DTLS server     using OpenSSL to consume an excessive amount of memory     and, possibly, exit unexpectedly after exhausting all     available memory. (CVE-2016-2179)

  - A flaw was found in the Datagram TLS (DTLS) replay     protection implementation in OpenSSL. A remote attacker     could possibly use this flaw to make a DTLS server using     OpenSSL to reject further packets sent from a DTLS     client over an established DTLS connection.
    (CVE-2016-2181)

  - An out of bounds write flaw was discovered in the     OpenSSL BN_bn2dec() function. An attacker able to make     an application using OpenSSL to process a large BIGNUM     could cause the application to crash or, possibly,     execute arbitrary code. (CVE-2016-2182)

  - A flaw was found in the DES/3DES cipher was used as part     of the TLS/SSL protocol. A man-in-the-middle attacker     could use this flaw to recover some plaintext data by     capturing large amounts of encrypted traffic between     TLS/SSL server and client if the communication used a     DES/3DES based ciphersuite. (CVE-2016-2183)

This update mitigates the CVE-2016-2183 issue by lowering priority of DES cipher suites so they are not preferred over cipher suites using AES. For compatibility reasons, DES cipher suites remain enabled by default and included in the set of cipher suites identified by the HIGH cipher string. Future updates may move them to MEDIUM or not enable them by default.

  - An integer underflow flaw leading to a buffer over-read     was found in the way OpenSSL parsed TLS session tickets.
    A remote attacker could use this flaw to crash a TLS     server using OpenSSL if it used SHA-512 as HMAC for     session tickets. (CVE-2016-6302)

  - Multiple integer overflow flaws were found in the way     OpenSSL performed pointer arithmetic. A remote attacker     could possibly use these flaws to cause a TLS/SSL server     or client using OpenSSL to crash. (CVE-2016-2177)

  - An out of bounds read flaw was found in the way OpenSSL     formatted Public Key Infrastructure Time-Stamp Protocol     data for printing. An attacker could possibly cause an     application using OpenSSL to crash if it printed time     stamp data from the attacker. (CVE-2016-2180)

  - Multiple out of bounds read flaws were found in the way     OpenSSL handled certain TLS/SSL protocol handshake     messages. A remote attacker could possibly use these     flaws to crash a TLS/SSL server or client using OpenSSL.
    (CVE-2016-6306)

The version of OpenSSL installed on the remote host is prior to 1.0.1u. It is, therefore, affected by multiple vulnerabilities as referenced in the 1.0.1u advisory.

  - Multiple memory leaks in t1_lib.c in OpenSSL before 1.0.1u, 1.0.2 before 1.0.2i, and 1.1.0 before 1.1.0a     allow remote attackers to cause a denial of service (memory consumption) via large OCSP Status Request     extensions. (CVE-2016-6304)

  - The certificate parser in OpenSSL before 1.0.1u and 1.0.2 before 1.0.2i might allow remote attackers to     cause a denial of service (out-of-bounds read) via crafted certificate operations, related to s3_clnt.c     and s3_srvr.c. (CVE-2016-6306)

  - Integer overflow in the MDC2_Update function in crypto/mdc2/mdc2dgst.c in OpenSSL before 1.1.0 allows     remote attackers to cause a denial of service (out-of-bounds write and application crash) or possibly have     unspecified other impact via unknown vectors. (CVE-2016-6303)

  - The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size     during validation of the ticket length, which allows remote attackers to cause a denial of service via a     ticket that is too short. (CVE-2016-6302)

  - The DTLS implementation in OpenSSL before 1.1.0 does not properly restrict the lifetime of queue entries     associated with unused out-of-order messages, which allows remote attackers to cause a denial of service     (memory consumption) by maintaining many crafted DTLS sessions simultaneously, related to d1_lib.c,     statem_dtls.c, statem_lib.c, and statem_srvr.c. (CVE-2016-2179)

  - The Anti-Replay feature in the DTLS implementation in OpenSSL before 1.1.0 mishandles early use of a new     epoch number in conjunction with a large sequence number, which allows remote attackers to cause a denial     of service (false-positive packet drops) via spoofed DTLS records, related to rec_layer_d1.c and     ssl3_record.c. (CVE-2016-2181)

  - The BN_bn2dec function in crypto/bn/bn_print.c in OpenSSL before 1.1.0 does not properly validate division     results, which allows remote attackers to cause a denial of service (out-of-bounds write and application     crash) or possibly have unspecified other impact via unknown vectors. (CVE-2016-2182)

  - The TS_OBJ_print_bio function in crypto/ts/ts_lib.c in the X.509 Public Key Infrastructure Time-Stamp     Protocol (TSP) implementation in OpenSSL through 1.0.2h allows remote attackers to cause a denial of     service (out-of-bounds read and application crash) via a crafted time-stamp file that is mishandled by the     openssl ts command. (CVE-2016-2180)

  - The dsa_sign_setup function in crypto/dsa/dsa_ossl.c in OpenSSL through 1.0.2h does not properly ensure     the use of constant-time operations, which makes it easier for local users to discover a DSA private key     via a timing side-channel attack. (CVE-2016-2178)

  - OpenSSL through 1.0.2h incorrectly uses pointer arithmetic for heap-buffer boundary checks, which might     allow remote attackers to cause a denial of service (integer overflow and application crash) or possibly     have unspecified other impact by leveraging unexpected malloc behavior, related to s3_srvr.c, ssl_sess.c,     and t1_lib.c. (CVE-2016-2177)

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

The version of OpenSSL installed on the remote host is prior to 1.0.2i. It is, therefore, affected by multiple vulnerabilities as referenced in the 1.0.2i advisory.

  - Multiple memory leaks in t1_lib.c in OpenSSL before 1.0.1u, 1.0.2 before 1.0.2i, and 1.1.0 before 1.1.0a     allow remote attackers to cause a denial of service (memory consumption) via large OCSP Status Request     extensions. (CVE-2016-6304)

  - The certificate parser in OpenSSL before 1.0.1u and 1.0.2 before 1.0.2i might allow remote attackers to     cause a denial of service (out-of-bounds read) via crafted certificate operations, related to s3_clnt.c     and s3_srvr.c. (CVE-2016-6306)

  - Integer overflow in the MDC2_Update function in crypto/mdc2/mdc2dgst.c in OpenSSL before 1.1.0 allows     remote attackers to cause a denial of service (out-of-bounds write and application crash) or possibly have     unspecified other impact via unknown vectors. (CVE-2016-6303)

  - The DES and Triple DES ciphers, as used in the TLS, SSH, and IPSec protocols and other protocols and     products, have a birthday bound of approximately four billion blocks, which makes it easier for remote     attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as     demonstrated by an HTTPS session using Triple DES in CBC mode, aka a Sweet32 attack. (CVE-2016-2183)

  - The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size     during validation of the ticket length, which allows remote attackers to cause a denial of service via a     ticket that is too short. (CVE-2016-6302)

  - The DTLS implementation in OpenSSL before 1.1.0 does not properly restrict the lifetime of queue entries     associated with unused out-of-order messages, which allows remote attackers to cause a denial of service     (memory consumption) by maintaining many crafted DTLS sessions simultaneously, related to d1_lib.c,     statem_dtls.c, statem_lib.c, and statem_srvr.c. (CVE-2016-2179)

  - The Anti-Replay feature in the DTLS implementation in OpenSSL before 1.1.0 mishandles early use of a new     epoch number in conjunction with a large sequence number, which allows remote attackers to cause a denial     of service (false-positive packet drops) via spoofed DTLS records, related to rec_layer_d1.c and     ssl3_record.c. (CVE-2016-2181)

  - The BN_bn2dec function in crypto/bn/bn_print.c in OpenSSL before 1.1.0 does not properly validate division     results, which allows remote attackers to cause a denial of service (out-of-bounds write and application     crash) or possibly have unspecified other impact via unknown vectors. (CVE-2016-2182)

  - The TS_OBJ_print_bio function in crypto/ts/ts_lib.c in the X.509 Public Key Infrastructure Time-Stamp     Protocol (TSP) implementation in OpenSSL through 1.0.2h allows remote attackers to cause a denial of     service (out-of-bounds read and application crash) via a crafted time-stamp file that is mishandled by the     openssl ts command. (CVE-2016-2180)

  - The dsa_sign_setup function in crypto/dsa/dsa_ossl.c in OpenSSL through 1.0.2h does not properly ensure     the use of constant-time operations, which makes it easier for local users to discover a DSA private key     via a timing side-channel attack. (CVE-2016-2178)

  - OpenSSL through 1.0.2h incorrectly uses pointer arithmetic for heap-buffer boundary checks, which might     allow remote attackers to cause a denial of service (integer overflow and application crash) or possibly     have unspecified other impact by leveraging unexpected malloc behavior, related to s3_srvr.c, ssl_sess.c,     and t1_lib.c. (CVE-2016-2177)

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

It was discovered that OpenSSL did not always use constant time operations when computing Digital Signature Algorithm (DSA) signatures. A local attacker could possibly use this flaw to obtain a private DSA key belonging to another user or service running on the same system. (CVE-2016-2178)

It was discovered that the Datagram TLS (DTLS) implementation could fail to release memory in certain cases. A malicious DTLS client could cause a DTLS server using OpenSSL to consume an excessive amount of memory and, possibly, exit unexpectedly after exhausting all available memory. (CVE-2016-2179)

A flaw was found in the Datagram TLS (DTLS) replay protection implementation in OpenSSL. A remote attacker could possibly use this flaw to make a DTLS server using OpenSSL to reject further packets sent from a DTLS client over an established DTLS connection.
(CVE-2016-2181)

An out of bounds write flaw was discovered in the OpenSSL BN_bn2dec() function. An attacker able to make an application using OpenSSL to process a large BIGNUM could cause the application to crash or, possibly, execute arbitrary code. (CVE-2016-2182)

A flaw was found in the DES/3DES cipher was used as part of the TLS/SSL protocol. A man-in-the-middle attacker could use this flaw to recover some plaintext data by capturing large amounts of encrypted traffic between TLS/SSL server and client if the communication used a DES/3DES based ciphersuite. (CVE-2016-2183)

An integer underflow flaw leading to a buffer over-read was found in the way OpenSSL parsed TLS session tickets. A remote attacker could use this flaw to crash a TLS server using OpenSSL if it used SHA-512 as HMAC for session tickets. (CVE-2016-6302)

Multiple integer overflow flaws were found in the way OpenSSL performed pointer arithmetic. A remote attacker could possibly use these flaws to cause a TLS/SSL server or client using OpenSSL to crash. (CVE-2016-2177)

An out of bounds read flaw was found in the way OpenSSL formatted Public Key Infrastructure Time-Stamp Protocol data for printing. An attacker could possibly cause an application using OpenSSL to crash if it printed time stamp data from the attacker. (CVE-2016-2180)

Multiple out of bounds read flaws were found in the way OpenSSL handled certain TLS/SSL protocol handshake messages. A remote attacker could possibly use these flaws to crash a TLS/SSL server or client using OpenSSL. (CVE-2016-6306)

This update mitigates the CVE-2016-2183 issue by lowering priority of DES cipher suites so they are not preferred over cipher suites using AES. For compatibility reasons, DES cipher suites remain enabled by default and included in the set of cipher suites identified by the HIGH cipher string. Future updates may move them to MEDIUM or not enable them by default.

The version of Tenable Passive Vulnerability Scanner (PVS) installed on the remote host is 5.x < 5.2.0. It is, therefore, affected by multiple vulnerabilities :

  - Multiple denial of service vulnerabilities exist in     Expat within file xmlparse.c due to a logical error in     hash computations. An unauthenticated, remote attacker     can exploit these, via a specially crafted XML file     containing many identifiers with the same value, to     cause the service to exhaust CPU resources.
    (CVE-2012-0876, CVE-2016-5300)

  - A flaw exists in the generate_hash_secret_salt()     function in file lib/xmlparse.c within Expat due to the     generation of non-random output by the PRNG. An     unauthenticated, remote attacker can exploit this to     more easily predict the PRNG output. (CVE-2012-6702)

  - Multiple buffer overflow conditions exist within Expat,     specifically in the XML_GetBuffer() function in file     lib/xmlparse.c, due to improper validation of     user-supplied input when handling compressed XML     content. An unauthenticated, remote attacker can exploit     these to execute arbitrary code. (CVE-2015-1283,     CVE-2016-4472)

  - Multiple buffer overflow conditions exist within the     Expat XML parser when handling malformed input documents     due to improper validation of user-supplied input. An     unauthenticated, remote attacker can exploit these to     cause a denial of service condition or the execution of     arbitrary code. (CVE-2016-0718, CVE-2016-0719)

  - Multiple integer overflow conditions exist in s3_srvr.c,     ssl_sess.c, and t1_lib.c due to improper use of pointer     arithmetic for heap-buffer boundary checks. An     unauthenticated, remote attacker can exploit these to     cause a denial of service. (CVE-2016-2177)

  - An information disclosure vulnerability exists in the     dsa_sign_setup() function in dsa_ossl.c due to a failure     to properly ensure the use of constant-time operations.
    An unauthenticated, remote attacker can exploit this,     via a timing side-channel attack, to disclose DSA key     information. (CVE-2016-2178)

  - A denial of service vulnerability exists in the DTLS     implementation due to a failure to properly restrict the     lifetime of queue entries associated with unused     out-of-order messages. An unauthenticated, remote     attacker can exploit this, by maintaining multiple     crafted DTLS sessions simultaneously, to exhaust memory.
    (CVE-2016-2179)

  - An out-of-bounds read error exists in the X.509 Public     Key Infrastructure Time-Stamp Protocol (TSP)     implementation. An unauthenticated, remote attacker can     exploit this, via a crafted time-stamp file that is     mishandled by the 'openssl ts' command, to cause     denial of service or to disclose sensitive information.
    (CVE-2016-2180)

  - A denial of service vulnerability exists in the     Anti-Replay feature in the DTLS implementation due to     improper handling of epoch sequence numbers in records.
    An unauthenticated, remote attacker can exploit this,     via spoofed DTLS records, to cause legitimate packets to     be dropped. (CVE-2016-2181)

  - An overflow condition exists in the BN_bn2dec() function     in bn_print.c due to improper validation of     user-supplied input when handling BIGNUM values. An     unauthenticated, remote attacker can exploit this to     crash the process. (CVE-2016-2182)

  - A vulnerability exists, known as SWEET32, in the 3DES     and Blowfish algorithms due to the use of weak 64-bit     block ciphers by default. A man-in-the-middle attacker     who has sufficient resources can exploit this     vulnerability, via a 'birthday' attack, to detect a     collision that leaks the XOR between the fixed secret     and a known plaintext, allowing the disclosure of the     secret text, such as secure HTTPS cookies, and possibly     resulting in the hijacking of an authenticated session.
    (CVE-2016-2183)

  - A flaw exists in SQLite due to the use of insecure     temporary directories. A local attacker can exploit this     to cause a denial of service condition or possibly have     other more severe impact. (CVE-2016-6153)

  - A flaw exists in the tls_decrypt_ticket() function in     t1_lib.c due to improper handling of ticket HMAC     digests. An unauthenticated, remote attacker can exploit     this, via a ticket that is too short, to crash the     process, resulting in a denial of service.
    (CVE-2016-6302)

  - An integer overflow condition exists in the     MDC2_Update() function in mdc2dgst.c due to improper     validation of user-supplied input. An unauthenticated,     remote attacker can exploit this to cause a heap-based     buffer overflow, resulting in a denial of service     condition or possibly the execution of arbitrary code.
    (CVE-2016-6303)

  - A flaw exists in the ssl_parse_clienthello_tlsext()     function in t1_lib.c due to improper handling of overly     large OCSP Status Request extensions from clients. An     unauthenticated, remote attacker can exploit this, via     large OCSP Status Request extensions, to exhaust memory     resources, resulting in a denial of service condition.
    (CVE-2016-6304)

  - A flaw exists in the SSL_peek() function in     rec_layer_s3.c due to improper handling of empty     records. An unauthenticated, remote attacker can exploit     this, by triggering a zero-length record in an SSL_peek     call, to cause an infinite loop, resulting in a denial     of service condition. (CVE-2016-6305)

  - An out-of-bounds read error exists in the certificate     parser that allows an unauthenticated, remote attacker     to cause a denial of service via crafted certificate     operations. (CVE-2016-6306)

  - A denial of service vulnerability exists in the     state-machine implementation due to a failure to check     for an excessive length before allocating memory. An     unauthenticated, remote attacker can exploit this, via a     crafted TLS message, to exhaust memory resources.
    (CVE-2016-6307)

  - A denial of service vulnerability exists in the DTLS     implementation due to improper handling of excessively     long DTLS messages. An unauthenticated, remote attacker     can exploit this, via a crafted DTLS message, to exhaust     available memory resources. (CVE-2016-6308)

  - A remote code execution vulnerability exists in the     read_state_machine() function in statem.c due to     improper handling of messages larger than 16k. An     unauthenticated, remote attacker can exploit this, via a     specially crafted message, to cause a use-after-free     error, resulting in a denial of service condition or     possibly the execution of arbitrary code.
    (CVE-2016-6309)

  - A cross-site scripting (XSS) vulnerability exists within     the JQuery UI dialog() function due to improper     validation of input to the 'closeText' parameter before     returning it to users. An unauthenticated, remote     attacker can exploit this, via a specially crafted     request, to execute arbitrary script code in a user's     browser session. (CVE-2016-7103)

  - A denial of service vulnerability exists in x509_vfy.c     due to improper handling of certificate revocation lists     (CRLs). An unauthenticated, remote attacker can exploit     this, via a specially crafted CRL, to cause a NULL     pointer dereference, resulting in a crash of the     service. (CVE-2016-7052)

  - An unspecified cross-site scripting (XSS) vulnerability     exists in the web interface due to improper validation     of input before returning it to users. An     unauthenticated, remote attacker can exploit this, via a     specially crafted request, to execute arbitrary script     code in a user's browser session.

ID	Name	Product	Family	Published	Updated	Severity
93795	Scientific Linux Security Update : openssl on SL6.x, SL7.x i386/x86_64 (20160927)	Nessus	Scientific Linux Local Security Checks	9/29/2016	1/22/2026	critical
93814	OpenSSL 1.0.1 < 1.0.1u Multiple Vulnerabilities	Nessus	Web Servers	9/30/2016	10/23/2024	critical
93815	OpenSSL 1.0.2 < 1.0.2i Multiple Vulnerabilities	Nessus	Web Servers	9/30/2016	10/23/2024	critical
94021	Amazon Linux AMI : openssl (ALAS-2016-755)	Nessus	Amazon Linux Local Security Checks	10/13/2016	1/22/2026	critical
96337	Tenable Passive Vulnerability Scanner 5.x < 5.2.0 Multiple Vulnerabilities (SWEET32)	Nessus	Misc.	1/6/2017	1/6/2026	critical

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