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nessusThis script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.REDHAT-RHSA-2019-4256.NASL
HistoryDec 18, 2019 - 12:00 a.m.

RHEL 6 : kernel (RHSA-2019:4256)

2019-12-1800:00:00
This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
136

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

8.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

AI Score

7.6

Confidence

High

EPSS

0.001

Percentile

34.9%

An update for kernel is now available for Red Hat Enterprise Linux 6.

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: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)

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) :

  • KEYS: prevent creating a different userโ€™s keyrings RHEL-6.10 (BZ#1537371)

  • BUG: unable to handle kernel NULL pointer dereference at (null) (BZ# 1733760)

  • long I/O stalls with bnx2fc from not masking off scope bits of retry delay value (BZ#1749512)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:4256. The text 
# itself is copyright (C) Red Hat, Inc.
#

include('compat.inc');

if (description)
{
  script_id(132233);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/03");

  script_cve_id("CVE-2019-14821");
  script_xref(name:"RHSA", value:"2019:4256");

  script_name(english:"RHEL 6 : kernel (RHSA-2019:4256)");

  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 6.

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: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)

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) :

* KEYS: prevent creating a different user's keyrings RHEL-6.10
(BZ#1537371)

* BUG: unable to handle kernel NULL pointer dereference at (null) (BZ#
1733760)

* long I/O stalls with bnx2fc from not masking off scope bits of retry
delay value (BZ#1749512)");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2019:4256");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2019-14821");
  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:C/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-2019-14821");

  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:"2019/09/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/18");

  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-i686");
  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-firmware");
  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: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: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) 2019-2024 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:"^6([^0-9]|$)", string:os_ver)) 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);

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-2019-14821");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2019:4256");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2019:4256";
  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:"RHEL6", cpu:"i686", reference:"kernel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"kernel-abi-whitelists-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debug-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debug-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debug-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debug-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debug-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debug-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debug-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debug-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debug-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debuginfo-common-i686-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debuginfo-common-s390x-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"kernel-doc-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"kernel-firmware-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-headers-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-headers-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-headers-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-kdump-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-kdump-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-kdump-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"python-perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"python-perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"python-perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"python-perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"python-perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"python-perf-debuginfo-2.6.32-754.25.1.el6")) 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");
  }
}
VendorProductVersionCPE
redhatenterprise_linuxkernelp-cpe:/a:redhat:enterprise_linux:kernel
redhatenterprise_linuxkernel-abi-whitelistsp-cpe:/a:redhat:enterprise_linux:kernel-abi-whitelists
redhatenterprise_linuxkernel-debugp-cpe:/a:redhat:enterprise_linux:kernel-debug
redhatenterprise_linuxkernel-debug-debuginfop-cpe:/a:redhat:enterprise_linux:kernel-debug-debuginfo
redhatenterprise_linuxkernel-debug-develp-cpe:/a:redhat:enterprise_linux:kernel-debug-devel
redhatenterprise_linuxkernel-debuginfop-cpe:/a:redhat:enterprise_linux:kernel-debuginfo
redhatenterprise_linuxkernel-debuginfo-common-i686p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-i686
redhatenterprise_linuxkernel-debuginfo-common-s390xp-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-s390x
redhatenterprise_linuxkernel-debuginfo-common-x86_64p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-x86_64
redhatenterprise_linuxkernel-develp-cpe:/a:redhat:enterprise_linux:kernel-devel
Rows per page:
1-10 of 211

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

8.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

AI Score

7.6

Confidence

High

EPSS

0.001

Percentile

34.9%