RHEL 6 : kernel-rt (RHSA-2012:0670)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2012:0670. The text 
# itself is copyright (C) Red Hat, Inc.
#

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

if (description)
{
  script_id(76644);
  script_version("1.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/03");

  script_cve_id("CVE-2011-4086", "CVE-2012-2123");
  script_bugtraq_id(51945, 53166);
  script_xref(name:"RHSA", value:"2012:0670");

  script_name(english:"RHEL 6 : kernel-rt (RHSA-2012:0670)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for kernel-rt.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2012:0670 advisory.

    The kernel-rt packages contain the Linux kernel, the core of any Linux
    operating system.

    This update fixes the following security issues:

    * When a set user ID (setuid) application is executed, certain personality
    flags for controlling the application's behavior are cleared (that is, a
    privileged application will not be affected by those flags). It was found
    that those flags were not cleared if the application was made privileged
    via file system capabilities. A local, unprivileged user could use this
    flaw to change the behavior of such applications, allowing them to bypass
    intended restrictions. Note that for default installations, no application
    shipped by Red Hat for Red Hat Enterprise MRG is made privileged via file
    system capabilities. (CVE-2012-2123, Important)

    * A flaw was found in the way the Linux kernel's journal_unmap_buffer()
    function handled buffer head states. On systems that have an ext4 file
    system with a journal mounted, a local, unprivileged user could use this
    flaw to cause a denial of service. (CVE-2011-4086, Moderate)

    This update also fixes the following bugs:

    * The CAP_SYS_ADMIN check was missing from the dmesg_restrict feature.
    Consequently, an unprivileged and jailed root user could bypass the
    dmesg_restrict protection. This update adds CAP_SYS_ADMIN to both
    dmesg_restrict and kptr_restrict, which only allows writing to
    dmesg_restrict when root has CAP_SYS_ADMIN. (BZ#808271)

    * Previously, the _copy_from_pages() function, which is used to copy data
    from the temporary buffer to the user-passed buffer, was passed the wrong
    size parameter when copying data. Consequently, if the user provided a
    buffer greater than PAGE_SIZE, the getxattr() syscalls were handled
    incorrectly. This update fixes _copy_from_pages() to use the ACL length,
    which uses a correctly-sized buffer. (BZ#753230)

    * Some older versions of hardware or their software could not recognize
    certain commands and would log messages for illegal or unsupported errors
    the driver could not properly handle. This bug has been fixed and no bogus
    error messages are now returned in the described scenario. (BZ#813892)

    * Previously, the qla2x00_poll() function did the local_irq_save() call
    before calling qla24xx_intr_handler(), which had a spinlock. Since
    spinlocks are sleepable in the real-time kernel, it is not allowed to call
    them with interrupts disabled. This scenario produced error messages and
    could cause a system deadlock. With this update, the
    local_irq_save_nort(flags) function is used to save flags without disabling
    interrupts, which prevents potential deadlocks and removes the error
    messages. (BZ#818220)

    Users should upgrade to these updated packages, which correct these issues.
    The system must be rebooted for this update to take effect.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://access.redhat.com/security/data/csaf/v2/advisories/2012/rhsa-2012_0670.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f5427a98");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2012:0670");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=749143");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=806722");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=818220");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL kernel-rt package based on the guidance in RHSA-2012:0670.");
  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:N/I:N/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-2012-2123");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2011-4086");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2012/05/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2012/05/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/07/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-firmware");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-vanilla");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-vanilla-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2014-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');
include('rhel.inc');
include('ksplice.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '6')) audit(AUDIT_OS_NOT, 'Red Hat 6.x', 'Red Hat ' + 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$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  rm_kb_item(name:'Host/uptrack-uname-r');
  var cve_list = make_list('CVE-2011-4086', 'CVE-2012-2123');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for RHSA-2012:0670');
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

var constraints = [
  {
    'repo_relative_urls': [
      'content/dist/rhel/server/6/6Server/x86_64/mrg-g-execute/2/debug',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-g-execute/2/os',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-g-execute/2/source/SRPMS',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-g/2/debug',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-g/2/os',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-g/2/source/SRPMS',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-m/2/debug',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-m/2/os',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-m/2/source/SRPMS',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-mgmt/2/debug',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-mgmt/2/os',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-mgmt/2/source/SRPMS',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-r/2/debug',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-r/2/os',
      'content/dist/rhel/server/6/6Server/x86_64/mrg-r/2/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'kernel-rt-3.0.30-rt50.62.el6rt', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-debug-3.0.30-rt50.62.el6rt', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-debug-devel-3.0.30-rt50.62.el6rt', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-devel-3.0.30-rt50.62.el6rt', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-doc-3.0.30-rt50.62.el6rt', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-firmware-3.0.30-rt50.62.el6rt', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-trace-3.0.30-rt50.62.el6rt', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-trace-devel-3.0.30-rt50.62.el6rt', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-vanilla-3.0.30-rt50.62.el6rt', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'},
      {'reference':'kernel-rt-vanilla-devel-3.0.30-rt50.62.el6rt', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rt', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'mrg-release'}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
  foreach var pkg ( constraint_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;
    var cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        _release &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || 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, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kernel-rt / kernel-rt-debug / kernel-rt-debug-devel / etc');
}