Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4300)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2018-4300.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(119535);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/09/08");

  script_cve_id(
    "CVE-2014-9728",
    "CVE-2016-3713",
    "CVE-2017-13168",
    "CVE-2017-17805",
    "CVE-2017-17806",
    "CVE-2018-7755",
    "CVE-2018-10021",
    "CVE-2018-10902",
    "CVE-2018-10940",
    "CVE-2018-16658",
    "CVE-2018-18710",
    "CVE-2018-1000204"
  );

  script_name(english:"Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4300)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in
the ELSA-2018-4300 advisory.

  - The Salsa20 encryption algorithm in the Linux kernel before 4.14.8 does 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. (CVE-2017-17805)

  - It was found that the raw midi kernel driver does not protect against concurrent access which leads to a
    double realloc (double free) in snd_rawmidi_input_params() and snd_rawmidi_output_status() which are part
    of snd_rawmidi_ioctl() handler in rawmidi.c file. A malicious local attacker could possibly use this for
    privilege escalation. (CVE-2018-10902)

  - An elevation of privilege vulnerability in the kernel scsi driver. Product: Android. Versions: Android
    kernel. Android ID A-65023233. (CVE-2017-13168)

  - ** DISPUTED ** Linux Kernel version 3.18 to 4.16 incorrectly handles an SG_IO ioctl on /dev/sg0 with
    dxfer_direction=SG_DXFER_FROM_DEV and an empty 6-byte cmdp. This may lead to copying up to 1000 kernel
    heap pages to the userspace. This has been fixed upstream in
    https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 already. The problem has
    limited scope, as users don't usually have permissions to access SCSI devices. On the other hand, e.g. the
    Nero user manual suggests doing `chmod o+r+w /dev/sg*` to make the devices accessible. NOTE: third parties
    dispute the relevance of this report, noting that the requirement for an attacker to have both the
    CAP_SYS_ADMIN and CAP_SYS_RAWIO capabilities makes it virtually impossible to exploit.
    (CVE-2018-1000204)

  - An issue was discovered in the Linux kernel through 4.19. An information leak in cdrom_ioctl_select_disc
    in drivers/cdrom/cdrom.c could be used by local attackers to read kernel memory because a cast from
    unsigned long to int interferes with bounds checking. This is similar to CVE-2018-10940 and
    CVE-2018-16658. (CVE-2018-18710)

  - The UDF filesystem implementation in the Linux kernel before 3.18.2 does not validate certain lengths,
    which allows local users to cause a denial of service (buffer over-read and system crash) via a crafted
    filesystem image, related to fs/udf/inode.c and fs/udf/symlink.c. (CVE-2014-9728)

  - The msr_mtrr_valid function in arch/x86/kvm/mtrr.c in the Linux kernel before 4.6.1 supports MSR 0x2f8,
    which allows guest OS users to read or write to the kvm_arch_vcpu data structure, and consequently obtain
    sensitive information or cause a denial of service (system crash), via a crafted ioctl call.
    (CVE-2016-3713)

  - The HMAC implementation (crypto/hmac.c) in the Linux kernel before 4.14.8 does 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 buffer overflow by executing a crafted sequence of system calls that encounter a missing
    SHA-3 initialization. (CVE-2017-17806)

  - An issue was discovered in the fd_locked_ioctl function in drivers/block/floppy.c in the Linux kernel
    through 4.15.7. The floppy driver will copy a kernel pointer to user memory in response to the FDGETPRM
    ioctl. An attacker can send the FDGETPRM ioctl and use the obtained kernel pointer to discover the
    location of kernel code and data and bypass kernel security protections such as KASLR. (CVE-2018-7755)

  - ** DISPUTED ** drivers/scsi/libsas/sas_scsi_host.c in the Linux kernel before 4.16 allows local users to
    cause a denial of service (ata qc leak) by triggering certain failure conditions. NOTE: a third party
    disputes the relevance of this report because the failure can only occur for physically proximate
    attackers who unplug SAS Host Bus Adapter cables. (CVE-2018-10021)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/errata/ELSA-2018-4300.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-17806");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/06/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dtrace-modules-3.8.13-118.28.1.el6uek");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dtrace-modules-3.8.13-118.28.1.el7uek");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-firmware");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Oracle Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2018-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("linux_alt_patch_detect.nasl", "ssh_get_info.nasl");
  script_require_keys("Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");

  exit(0);
}


include('audit.inc');
include('global_settings.inc');
include('ksplice.inc');
include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item('Host/OracleLinux')) audit(AUDIT_OS_NOT, 'Oracle Linux');
var release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
var os_ver = os_ver[1];
if (! preg(pattern:"^(6|7)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 6 / 7', 'Oracle Linux ' + os_ver);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);
if ('x86_64' >!< cpu) audit(AUDIT_ARCH_NOT, 'x86_64', cpu);

var machine_uptrack_level = get_one_kb_item('Host/uptrack-uname-r');
if (machine_uptrack_level)
{
  var trimmed_uptrack_level = ereg_replace(string:machine_uptrack_level, pattern:"\.(x86_64|i[3-6]86|aarch64)$", replace:'');
  var fixed_uptrack_levels = ['3.8.13-118.28.1.el6uek', '3.8.13-118.28.1.el7uek'];
  foreach var fixed_uptrack_level ( fixed_uptrack_levels ) {
    if (rpm_spec_vers_cmp(a:trimmed_uptrack_level, b:fixed_uptrack_level) >= 0)
    {
      audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for ELSA-2018-4300');
    }
  }
  __rpm_report = 'Running KSplice level of ' + trimmed_uptrack_level + ' does not meet the minimum fixed level of ' + join(fixed_uptrack_levels, sep:' / ') + ' for this advisory.\n\n';
}

var kernel_major_minor = get_kb_item('Host/uname/major_minor');
if (empty_or_null(kernel_major_minor)) exit(1, 'Unable to determine kernel major-minor level.');
var expected_kernel_major_minor = '3.8';
if (kernel_major_minor != expected_kernel_major_minor)
  audit(AUDIT_OS_NOT, 'running kernel level ' + expected_kernel_major_minor + ', it is running kernel level ' + kernel_major_minor);

var pkgs = [
    {'reference':'dtrace-modules-3.8.13-118.28.1.el6uek-0.4.5-3.el6', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-uek-3.8.13-118.28.1.el6uek', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-3.8.13'},
    {'reference':'kernel-uek-debug-3.8.13-118.28.1.el6uek', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-3.8.13'},
    {'reference':'kernel-uek-debug-devel-3.8.13-118.28.1.el6uek', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-devel-3.8.13'},
    {'reference':'kernel-uek-devel-3.8.13-118.28.1.el6uek', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-devel-3.8.13'},
    {'reference':'kernel-uek-doc-3.8.13-118.28.1.el6uek', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-doc-3.8.13'},
    {'reference':'kernel-uek-firmware-3.8.13-118.28.1.el6uek', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-firmware-3.8.13'},
    {'reference':'dtrace-modules-3.8.13-118.28.1.el7uek-0.4.5-3.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-uek-3.8.13-118.28.1.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-3.8.13'},
    {'reference':'kernel-uek-debug-3.8.13-118.28.1.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-3.8.13'},
    {'reference':'kernel-uek-debug-devel-3.8.13-118.28.1.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-devel-3.8.13'},
    {'reference':'kernel-uek-devel-3.8.13-118.28.1.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-devel-3.8.13'},
    {'reference':'kernel-uek-doc-3.8.13-118.28.1.el7uek', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-doc-3.8.13'},
    {'reference':'kernel-uek-firmware-3.8.13-118.28.1.el7uek', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-firmware-3.8.13'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var release = NULL;
  var sp = NULL;
  var cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = 'EL' + package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (reference && release) {
    if (exists_check) {
        if (rpm_exists(release:release, rpm:exists_check) && rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
    } else {
        if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
    }
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'dtrace-modules-3.8.13-118.28.1.el6uek / dtrace-modules-3.8.13-118.28.1.el7uek / kernel-uek / etc');
}