SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2018:0010-1) (Meltdown) (Spectre)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2018:0010-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(105574);
  script_version("3.12");
  script_cvs_date("Date: 2019/09/10 13:51:46");

  script_cve_id("CVE-2017-17805", "CVE-2017-17806", "CVE-2017-5715", "CVE-2017-5753", "CVE-2017-5754");
  script_xref(name:"IAVA", value:"2018-A-0019");
  script_xref(name:"IAVA", value:"2018-A-0020");

  script_name(english:"SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2018:0010-1) (Meltdown) (Spectre)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The SUSE Linux Enterprise 12 SP3 kernel was updated to receive various
security and bugfixes. This update adds mitigations for various side
channel attacks against modern CPUs that could disclose content of
otherwise unreadable memory (bnc#1068032).

  - CVE-2017-5753 / 'SpectreAttack': Local attackers on
    systems with modern CPUs featuring deep instruction
    pipelining could use attacker controllable speculative
    execution over code patterns in the Linux Kernel to leak
    content from otherwise not readable memory in the same
    address space, allowing retrieval of passwords,
    cryptographic keys and other secrets. This problem is
    mitigated by adding speculative fencing on affected code
    paths throughout the Linux kernel.

  - CVE-2017-5715 / 'SpectreAttack': Local attackers on
    systems with modern CPUs featuring branch prediction
    could use mispredicted branches to speculatively execute
    code patterns that in turn could be made to leak other
    non-readable content in the same address space, an
    attack similar to CVE-2017-5753. This problem is
    mitigated by disabling predictive branches, depending on
    CPU architecture either by firmware updates and/or fixes
    in the user-kernel privilege boundaries. Please also
    check with your CPU / Hardware vendor for available
    firmware or BIOS updates. As this feature can have a
    performance impact, it can be disabled using the
    'nospec' kernel commandline option.

  - CVE-2017-5754 / 'MeltdownAttack': Local attackers on
    systems with modern CPUs featuring deep instruction
    pipelining could use code patterns in userspace to
    speculative executive code that would read otherwise
    read protected memory. This problem is mitigated by
    unmapping the Linux Kernel from the user address space
    during user code execution, following a approach called
    'KAISER'. The terms used here are 'KAISER' / 'Kernel
    Address Isolation' and 'PTI' / 'Page Table Isolation'.
    This is only enabled by default on affected
    architectures. This feature can be enabled / disabled by
    the 'pti=[on|off|auto]' or 'nopti' commandline options.
    The following security bugs were fixed :

  - CVE-2017-17806: The HMAC implementation (crypto/hmac.c)
    in the Linux kernel did not validate that the underlying
    cryptographic hash algorithm is unkeyed, allowing a
    local attacker able to use the AF_ALG-based hash
    interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3
    hash algorithm (CONFIG_CRYPTO_SHA3) to cause a kernel
    stack-based buffer overflow by executing a crafted
    sequence of system calls that encounter a missing SHA-3
    initialization (bnc#1073874).

  - CVE-2017-17805: The Salsa20 encryption algorithm in the
    Linux kernel did not correctly handle zero-length
    inputs, allowing a local attacker able to use the
    AF_ALG-based skcipher interface
    (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of
    service (uninitialized-memory free and kernel crash) or
    have unspecified other impact by executing a crafted
    sequence of system calls that use the blkcipher_walk
    API. Both the generic implementation
    (crypto/salsa20_generic.c) and x86 implementation
    (arch/x86/crypto/salsa20_glue.c) of Salsa20 were
    vulnerable (bnc#1073792).

The update package also includes non-security fixes. See advisory for
details.

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."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1005778"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1005780"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1005781"
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  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1012382"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1017967"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1039616"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1047487"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1063043"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1064311"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1065180"
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  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1068032"
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  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1068951"
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  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1070116"
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  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1071009"
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  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1072166"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1072216"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1072556"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1072866"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1072890"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1072962"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1073090"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1073525"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1073792"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1073809"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1073868"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1073874"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1073912"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=963897"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=964063"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=966170"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=966172"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-17805/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-17806/"
  );
  script_set_attribute(
    attribute:"see_also",
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  script_set_attribute(
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  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-5754/"
  );
  # https://www.suse.com/support/update/announcement/2018/suse-su-20180010-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?abca72d4"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Workstation Extension 12-SP3:zypper in -t patch
SUSE-SLE-WE-12-SP3-2018-12=1

SUSE Linux Enterprise Software Development Kit 12-SP3:zypper in -t
patch SUSE-SLE-SDK-12-SP3-2018-12=1

SUSE Linux Enterprise Server 12-SP3:zypper in -t patch
SUSE-SLE-SERVER-12-SP3-2018-12=1

SUSE Linux Enterprise Live Patching 12-SP3:zypper in -t patch
SUSE-SLE-Live-Patching-12-SP3-2018-12=1

SUSE Linux Enterprise High Availability 12-SP3:zypper in -t patch
SUSE-SLE-HA-12-SP3-2018-12=1

SUSE Linux Enterprise Desktop 12-SP3:zypper in -t patch
SUSE-SLE-DESKTOP-12-SP3-2018-12=1

SUSE Container as a Service Platform ALL:zypper in -t patch
SUSE-CAASP-ALL-2018-12=1

To bring your system up-to-date, use 'zypper patch'."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default-base-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default-extra-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-default-man");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-syms");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/12/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/01/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/04");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

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

  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, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLED12|SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED12 / SLES12", "SUSE " + os_ver);

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(3)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP3", os_ver + " SP" + sp);
if (os_ver == "SLED12" && (! preg(pattern:"^(3)$", string:sp))) audit(AUDIT_OS_NOT, "SLED12 SP3", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"3", cpu:"s390x", reference:"kernel-default-man-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"kernel-default-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"kernel-default-base-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"kernel-default-base-debuginfo-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"kernel-default-debuginfo-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"kernel-default-debugsource-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"kernel-default-devel-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"kernel-syms-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"kernel-default-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"kernel-default-debuginfo-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"kernel-default-debugsource-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"kernel-default-devel-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"kernel-default-extra-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"kernel-default-extra-debuginfo-4.4.103-6.38.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"kernel-syms-4.4.103-6.38.1")) 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, "kernel");
}