The ssl3_get_key_exchange function in ssl/s3_clnt.c in OpenSSL 1.0.2 before 1.0.2e allows remote servers to cause a denial of service (segmentation fault) via a zero p value in an anonymous Diffie-Hellman (DH) ServerKeyExchange message.

According to its self-reported version number, the remote Juniper Junos device is affected by the following vulnerabilities related to OpenSSL :

  - A flaw exists in the ssl3_get_key_exchange() function     in file s3_clnt.c when handling a ServerKeyExchange     message for an anonymous DH ciphersuite with the value     of 'p' set to 0. A attacker can exploit this, by causing     a segmentation fault, to crash an application linked     against the library, resulting in a denial of service.
    (CVE-2015-1794)

  - A carry propagating flaw exists in the x86_64 Montgomery     squaring implementation that may cause the BN_mod_exp()     function to produce incorrect results. An attacker can     exploit this to obtain sensitive information regarding     private keys. (CVE-2015-3193)

  - A NULL pointer dereference flaw exists in file     rsa_ameth.c due to improper handling of ASN.1 signatures     that are missing the PSS parameter. A remote attacker     can exploit this to cause the signature verification     routine to crash, resulting in a denial of service     condition. (CVE-2015-3194)

  - A flaw exists in the ASN1_TFLG_COMBINE implementation in     file tasn_dec.c related to handling malformed     X509_ATTRIBUTE structures. A remote attacker can exploit     this to cause a memory leak by triggering a decoding     failure in a PKCS#7 or CMS application, resulting in a     denial of service. (CVE-2015-3195)

  - A race condition exists in s3_clnt.c that is triggered     when PSK identity hints are incorrectly updated in the     parent SSL_CTX structure when they are received by a     multi-threaded client. A remote attacker can exploit     this, via a crafted ServerKeyExchange message, to cause     a double-free memory error, resulting in a denial of     service. (CVE-2015-3196)

  - A cipher algorithm downgrade vulnerability exists 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)

  - A key disclosure vulnerability exists 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 flaw exists in the SSLv2 implementation,     specifically in the get_client_master_key() function     within file s2_srvr.c, due to accepting a nonzero     CLIENT-MASTER-KEY CLEAR-KEY-LENGTH value for an     arbitrary cipher. A man-in-the-middle attacker can     exploit this to determine the MASTER-KEY value and     decrypt TLS ciphertext by leveraging a Bleichenbacher     RSA padding oracle. (CVE-2016-0703)

  - A flaw exists in the SSLv2 oracle protection mechanism,     specifically in the get_client_master_key() function     within file s2_srvr.c, due to incorrectly overwriting     MASTER-KEY bytes during use of export cipher suites.
    A remote attackers can exploit this to more easily     decrypt TLS ciphertext by leveraging a Bleichenbacher     RSA padding oracle. (CVE-2016-0704)

  - A double-free error exists 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     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 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 that allow a     remote attacker to cause a denial of service condition     or the execution of arbitrary code. (CVE-2016-0799)

  - A heap buffer overflow condition exists in the     EVP_EncodeUpdate() function within file     crypto/evp/encode.c that is triggered when handling     a large amount of input data. An unauthenticated, remote     attacker can exploit this to cause a denial of service     condition. (CVE-2016-2105)

  - A heap buffer overflow condition exists in the     EVP_EncryptUpdate() function within file     crypto/evp/evp_enc.c that is triggered when handling a     large amount of input data after a previous call occurs     to the same function with a partial block. An     unauthenticated, remote attacker can exploit this to     cause a denial of service condition. (CVE-2016-2106)

  - A remote code execution vulnerability exists in the     ASN.1 encoder due to an underflow condition that occurs     when attempting to encode the value zero represented as     a negative integer. An unauthenticated, remote attacker     can exploit this to corrupt memory, resulting in the     execution of arbitrary code. (CVE-2016-2108)

  - Multiple unspecified flaws exist in the d2i BIO     functions when reading ASN.1 data from a BIO due to     invalid encoding causing a large allocation of memory.
    An unauthenticated, remote attacker can exploit these to     cause a denial of service condition through resource     exhaustion. (CVE-2016-2109)

  - 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 this 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)

  - 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)

  - 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 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)

Note that these issues only affects devices with J-Web or the SSL service for JUNOScript enabled.

According to its banner, the version of OpenSSL on the remote host is 1.0.2 prior to 1.0.2e and is affected by the following vulnerabilities :

 - A flaw in the 'ssl3_get_key_exchange()' function in 'ssl/s3_clnt.c' is triggered when handling a 'ServerKeyExchange' for an anon DH ciphersuite with the value of 'p' set to 0. This may allow a context-dependent attacker to crash an application linked against the library. (CVE-2015-1794)
 - A carry propagating flaw exists within the x86_64 Montgomery squaring procedure. This may cause 'BN_mod_exp' to produce incorrect results, which may potentially allow an attacker to derive information regarding private keys. (CVE-2015-3193)

The Oracle VM VirtualBox application installed on the remote host is a version prior to 4.3.36 or 5.0.18. It is, therefore, affected by an unspecified flaw in the Core subcomponent that allows a local attacker to gain elevated privileges. Additionally, multiple vulnerabilities exist in the bundled version of OpenSSL :

  - A flaw exists in the ssl3_get_key_exchange() function     in file s3_clnt.c when handling a ServerKeyExchange     message for an anonymous DH ciphersuite with the value     of 'p' set to 0. A attacker can exploit this, by causing     a segmentation fault, to crash an application linked     against the library, resulting in a denial of service.
    (CVE-2015-1794)

  - A carry propagating flaw exists in the x86_64 Montgomery     squaring implementation that may cause the BN_mod_exp()     function to produce incorrect results. An attacker can     exploit this to obtain sensitive information regarding     private keys. (CVE-2015-3193)

  - A NULL pointer dereference flaw exists in file     rsa_ameth.c due to improper handling of ASN.1 signatures     that are missing the PSS parameter. A remote attacker     can exploit this to cause the signature verification     routine to crash, resulting in a denial of service     condition. (CVE-2015-3194)

  - A flaw exists in the ASN1_TFLG_COMBINE implementation in     file tasn_dec.c related to handling malformed     X509_ATTRIBUTE structures. A remote attacker can exploit     this to cause a memory leak by triggering a decoding     failure in a PKCS#7 or CMS application, resulting in a     denial of service. (CVE-2015-3195)

  - A race condition exists in s3_clnt.c that is triggered     when PSK identity hints are incorrectly updated in the     parent SSL_CTX structure when they are received by a     multi-threaded client. A remote attacker can exploit     this, via a crafted ServerKeyExchange message, to cause     a double-free memory error, resulting in a denial of     service. (CVE-2015-3196)

  - A cipher algorithm downgrade vulnerability exists 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)

The remote host is affected by the vulnerability described in GLSA-201601-05 (OpenSSL: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in OpenSSL. Please review       the upstream advisory and CVE identifiers referenced below for details.
      Note that the list includes CVE identifiers for an older OpenSSL Security       Advisory (3 Dec 2015) for which we have not issued a GLSA before.
  Impact :

    A remote attacker could disclose a server&rsquo;s private DH exponent, or       complete SSLv2 handshakes using ciphers that have been disabled on the       server.
  Workaround :

    There is no known workaround at this time.

The Cisco AnyConnect Secure Mobility Client installed on the remote Mac OS X host is a version prior to 3.1.13015.0 or 4.2.x prior to 4.2.1035.0. It is, therefore, affected by multiple vulnerabilities in the bundled version of OpenSSL :
  - A carry propagating flaw exists in the x86_64 Montgomery     squaring implementation that may cause the BN_mod_exp()     function to produce incorrect results. An attacker can     exploit this to obtain sensitive information regarding     private keys. (CVE-2015-3193)

  - A NULL pointer dereference flaw exists in file     rsa_ameth.c when handling ASN.1 signatures that use the     RSA PSS algorithm but are missing a mask generation     function parameter. A remote attacker can exploit this     to cause the signature verification routine to crash,     leading to a denial of service. (CVE-2015-3194)

  - A flaw exists in the ASN1_TFLG_COMBINE implementation in     file tasn_dec.c related to handling malformed     X509_ATTRIBUTE structures. A remote attacker can exploit     this to cause a memory leak by triggering a decoding     failure in a PKCS#7 or CMS application, resulting in a     denial of service. (CVE-2015-3195)

  - A race condition exists in s3_clnt.c that is triggered     when PSK identity hints are incorrectly updated in the     parent SSL_CTX structure when they are received by a     multi-threaded client. A remote attacker can exploit     this, via a crafted ServerKeyExchange message, to cause     a double-free memory error, resulting in a denial of     service. (CVE-2015-3196)

  - A flaw exists in the ssl3_get_key_exchange() function     in file s3_clnt.c when handling a ServerKeyExchange     message for an anonymous DH ciphersuite with the value     of 'p' set to 0. A attacker can exploit this, by causing     a segmentation fault, to crash an application linked     against the library, resulting in a denial of service.
    (CVE-2015-1794)

The Cisco AnyConnect Secure Mobility Client installed on the remote host is a version prior to 3.1.13015.0 or 4.2.x prior to 4.2.1035.0.
It is, therefore, affected by multiple vulnerabilities in the bundled version of OpenSSL :
  - A carry propagating flaw exists in the x86_64 Montgomery     squaring implementation that may cause the BN_mod_exp()     function to produce incorrect results. An attacker can     exploit this to obtain sensitive information regarding     private keys. (CVE-2015-3193)

  - A NULL pointer dereference flaw exists in file     rsa_ameth.c when handling ASN.1 signatures that use the     RSA PSS algorithm but are missing a mask generation     function parameter. A remote attacker can exploit this     to cause the signature verification routine to crash,     leading to a denial of service. (CVE-2015-3194)

  - A flaw exists in the ASN1_TFLG_COMBINE implementation in     file tasn_dec.c related to handling malformed     X509_ATTRIBUTE structures. A remote attacker can exploit     this to cause a memory leak by triggering a decoding     failure in a PKCS#7 or CMS application, resulting in a     denial of service. (CVE-2015-3195)

  - A race condition exists in s3_clnt.c that is triggered     when PSK identity hints are incorrectly updated in the     parent SSL_CTX structure when they are received by a     multi-threaded client. A remote attacker can exploit     this, via a crafted ServerKeyExchange message, to cause     a double-free memory error, resulting in a denial of     service. (CVE-2015-3196)

  - A flaw exists in the ssl3_get_key_exchange() function     in file s3_clnt.c when handling a ServerKeyExchange     message for an anonymous DH ciphersuite with the value     of 'p' set to 0. A attacker can exploit this, by causing     a segmentation fault, to crash an application linked     against the library, resulting in a denial of service.
    (CVE-2015-1794)

New openssl packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2830-1 advisory.

    Guy Leaver discovered that OpenSSL incorrectly handled a ServerKeyExchange for an anonymous DH ciphersuite     with the value of p set to 0. A remote attacker could possibly use this issue to cause OpenSSL to crash,     resulting in a denial of service. This issue only applied to Ubuntu 15.10. (CVE-2015-1794)

    Hanno Bck discovered that the OpenSSL Montgomery squaring procedure algorithm may produce incorrect     results when being used on x86_64. A remote attacker could possibly use this issue to break encryption.
    This issue only applied to Ubuntu 15.10. (CVE-2015-3193)

    Loc Jonas Etienne discovered that OpenSSL incorrectly handled ASN.1 signatures with a missing PSS     parameter. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a     denial of service. (CVE-2015-3194)

    Adam Langley discovered that OpenSSL incorrectly handled malformed X509_ATTRIBUTE structures. A remote     attacker could possibly use this issue to cause OpenSSL to consume resources, resulting in a denial of     service. (CVE-2015-3195)

    It was discovered that OpenSSL incorrectly handled PSK identity hints. A remote attacker could possibly     use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only applied to     Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-3196)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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 1.0.2e. It is, therefore, affected by multiple vulnerabilities as referenced in the 1.0.2e advisory.

  - The ASN1_TFLG_COMBINE implementation in crypto/asn1/tasn_dec.c in OpenSSL before 0.9.8zh, 1.0.0 before     1.0.0t, 1.0.1 before 1.0.1q, and 1.0.2 before 1.0.2e mishandles errors caused by malformed X509_ATTRIBUTE     data, which allows remote attackers to obtain sensitive information from process memory by triggering a     decoding failure in a PKCS#7 or CMS application. (CVE-2015-3195)

  - crypto/rsa/rsa_ameth.c in OpenSSL 1.0.1 before 1.0.1q and 1.0.2 before 1.0.2e allows remote attackers to     cause a denial of service (NULL pointer dereference and application crash) via an RSA PSS ASN.1 signature     that lacks a mask generation function parameter. (CVE-2015-3194)

  - The Montgomery squaring implementation in crypto/bn/asm/x86_64-mont5.pl in OpenSSL 1.0.2 before 1.0.2e on     the x86_64 platform, as used by the BN_mod_exp function, mishandles carry propagation and produces     incorrect output, which makes it easier for remote attackers to obtain sensitive private-key information     via an attack against use of a (1) Diffie-Hellman (DH) or (2) Diffie-Hellman Ephemeral (DHE) ciphersuite.
    (CVE-2015-3193)

  - The ssl3_get_key_exchange function in ssl/s3_clnt.c in OpenSSL 1.0.2 before 1.0.2e allows remote servers     to cause a denial of service (segmentation fault) via a zero p value in an anonymous Diffie-Hellman (DH)     ServerKeyExchange message. (CVE-2015-1794)

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

OpenSSL project reports :

- BN_mod_exp may produce incorrect results on x86_64 (CVE-2015-3193)

- Certificate verify crash with missing PSS parameter (CVE-2015-3194)

- X509_ATTRIBUTE memory leak (CVE-2015-3195)

- Race condition handling PSK identify hint (CVE-2015-3196)

- Anon DH ServerKeyExchange with 0 p parameter (CVE-2015-1794)

ID	Name	Product	Family	Severity
96316	Juniper Junos Multiple OpenSSL Vulnerabilities (JSA10759) (SWEET32)	Nessus	Junos Local Security Checks	critical
9463	OpenSSL 1.0.2 < 1.0.2e Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	medium
90680	Oracle VM VirtualBox < 4.3.36 / 5.0.18 Multiple Vulnerabilities (April 2016 CPU)	Nessus	Misc.	medium
88586	GLSA-201601-05 : OpenSSL: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
88101	Mac OS X : Cisco AnyConnect Secure Mobility Client < 3.1.13015.0 / 4.2.x < 4.2.1035.0 Multiple OpenSSL Vulnerabilities	Nessus	MacOS X Local Security Checks	medium
88100	Cisco AnyConnect Secure Mobility Client < 3.1.13015.0 / 4.2.x < 4.2.1035.0 Multiple OpenSSL Vulnerabilities	Nessus	Windows	medium
87378	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : openssl (SSA:2015-349-04)	Nessus	Slackware Local Security Checks	high
87236	Ubuntu 14.04 LTS : OpenSSL vulnerabilities (USN-2830-1)	Nessus	Ubuntu Local Security Checks	high
87222	OpenSSL 1.0.2 < 1.0.2e Multiple Vulnerabilities	Nessus	Web Servers	high
87213	FreeBSD : openssl -- multiple vulnerabilities (4c8d1d72-9b38-11e5-aece-d050996490d0)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2015-1794

high

Tenable Plugins

critical

medium

medium

high

medium

medium

high

high

high

high