openSUSE Security Update : openssl (openSUSE-2016-327) (DROWN)

2016-03-14T00:00:00
ID OPENSUSE-2016-327.NASL
Type nessus
Reporter Tenable
Modified 2016-10-13T00:00:00

Description

This update for compat-openssl098 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-2016-0797 (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)

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

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2016-327.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(89910);
  script_version("$Revision: 2.9 $");
  script_cvs_date("$Date: 2016/10/13 14:27:28 $");

  script_cve_id("CVE-2015-0293", "CVE-2015-3197", "CVE-2016-0702", "CVE-2016-0703", "CVE-2016-0704", "CVE-2016-0797", "CVE-2016-0799", "CVE-2016-0800");

  script_name(english:"openSUSE Security Update : openssl (openSUSE-2016-327) (DROWN)");
  script_summary(english:"Check for the openSUSE-2016-327 patch");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for compat-openssl098 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-2016-0797 (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)

This update was imported from the SUSE:SLE-12:Update update project."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=952871"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=963415"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=968046"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=968048"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=968051"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=968053"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=968374"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected openssl packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:compat-openssl098-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libopenssl0_9_8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libopenssl0_9_8-32bit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libopenssl0_9_8-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libopenssl0_9_8-debuginfo-32bit");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:42.1");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/03/11");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/03/14");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016 Tenable Network Security, Inc.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE");
if (release !~ "^(SUSE42\.1)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "42.1", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(i586|i686|x86_64)$") audit(AUDIT_ARCH_NOT, "i586 / i686 / x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE42.1", reference:"compat-openssl098-debugsource-0.9.8j-9.1") ) flag++;
if ( rpm_check(release:"SUSE42.1", reference:"libopenssl0_9_8-0.9.8j-9.1") ) flag++;
if ( rpm_check(release:"SUSE42.1", reference:"libopenssl0_9_8-debuginfo-0.9.8j-9.1") ) flag++;
if ( rpm_check(release:"SUSE42.1", cpu:"x86_64", reference:"libopenssl0_9_8-32bit-0.9.8j-9.1") ) flag++;
if ( rpm_check(release:"SUSE42.1", cpu:"x86_64", reference:"libopenssl0_9_8-debuginfo-32bit-0.9.8j-9.1") ) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "compat-openssl098-debugsource / libopenssl0_9_8 / etc");
}