RHEL 7 : kernel (RHSA-2019:2696)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:2696. The text 
# itself is copyright (C) Red Hat, Inc.
#

include('compat.inc');

if (description)
{
  script_id(128662);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/19");

  script_cve_id(
    "CVE-2018-9568",
    "CVE-2018-13405",
    "CVE-2018-16871",
    "CVE-2018-16884",
    "CVE-2019-1125"
  );
  script_xref(name:"RHSA", value:"2019:2696");

  script_name(english:"RHEL 7 : kernel (RHSA-2019:2696)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"An update for kernel is now available for Red Hat Enterprise Linux 7.4
Extended Update Support.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

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

Security Fix(es) :

* kernel: Memory corruption due to incorrect socket cloning
(CVE-2018-9568)

* kernel: Missing check in fs/inode.c:inode_init_owner() does not
clear SGID bit on non-directories for non-members (CVE-2018-13405)

* kernel: nfs: use-after-free in svc_process_common() (CVE-2018-16884)

* kernel: nfs: NULL pointer dereference due to an anomalized NFS
message sequence (CVE-2018-16871)

* kernel: hw: Spectre SWAPGS gadget vulnerability (CVE-2019-1125)

For more details about the security issue(s), including the impact, a
CVSS score, acknowledgments, and other related information, refer to
the CVE page(s) listed in the References section.

Bug Fix(es) :

* fragmented packets timing out (BZ#1729411)

* kernel build: speed up debuginfo extraction (BZ#1731462)

* TCP packets are segmented when sent to the VM (TAP) (BZ#1732744)

* TCP packets are segmented when sent to the VLAN device when coming
from VXLAN dev. (BZ#1732809)

* skb head copy occurs when sending traffic over OVS managed VXLAN
tunnel (BZ #1733626)

* [mlx4] VXLAN over VLAN TCP segmentation (BZ#1734160)

* use 'make -jN' for modules_install (BZ#1735081)

* shmem: consider shm_mnt as a long-term mount (BZ#1737376)

* [ESXi][RHEL7]use-after-free of scsi_cmnd on VMware virtual guest
with vmw_pvscsi and ata_piix (BZ#1737377)

* Backport TCP follow-up for small buffers (BZ#1739127)");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/articles/4329821");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2019:2696");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2018-9568");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2018-13405");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2018-16871");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2018-16884");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2019-1125");
  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:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-9568");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2018-16884");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/09/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/09/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-abi-whitelists");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-s390x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-x86_64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-kdump");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-kdump-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-kdump-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:perf-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python-perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python-perf-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.4");
  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) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^7\.4([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.4", "Red Hat " + os_ver);

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

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< 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");
  cve_list = make_list("CVE-2018-13405", "CVE-2018-16871", "CVE-2018-16884", "CVE-2018-9568", "CVE-2019-1125");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2019:2696");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2019:2696";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", reference:"kernel-abi-whitelists-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debug-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debug-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debug-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debug-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debug-devel-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debug-devel-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debuginfo-common-s390x-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-devel-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-devel-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", reference:"kernel-doc-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-headers-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-headers-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-kdump-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-kdump-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-kdump-devel-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-tools-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-tools-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-tools-libs-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-tools-libs-devel-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"perf-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"perf-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"perf-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"perf-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"python-perf-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"python-perf-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"python-perf-debuginfo-3.10.0-693.58.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"python-perf-debuginfo-3.10.0-693.58.1.el7")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "kernel / kernel-abi-whitelists / kernel-debug / etc");
  }
}