Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4877-1)

2021-03-23T00:00:00
ID UBUNTU_USN-4877-1.NASL
Type nessus
Reporter Ubuntu Security Notice (C) 2021 Canonical, Inc. / NASL script (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2021-03-23T00:00:00

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4877-1 advisory.

  • mwifiex_cmd_802_11_ad_hoc_start in drivers/net/wireless/marvell/mwifiex/join.c in the Linux kernel through 5.10.4 might allow remote attackers to execute arbitrary code via a long SSID value, aka CID-5c455c5ab332. (CVE-2020-36158)

  • DISPUTED fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior. (CVE-2021-3178)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

                                        
                                            ##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4877-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(147992);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/03/23");

  script_cve_id("CVE-2020-36158", "CVE-2021-3178");
  script_xref(name:"USN", value:"4877-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4877-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-4877-1 advisory.

  - mwifiex_cmd_802_11_ad_hoc_start in drivers/net/wireless/marvell/mwifiex/join.c in the Linux kernel through
    5.10.4 might allow remote attackers to execute arbitrary code via a long SSID value, aka CID-5c455c5ab332.
    (CVE-2020-36158)

  - ** DISPUTED ** fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a
    subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via
    READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this
    attack; see also the exports(5) no_subtree_check default behavior. (CVE-2021-3178)

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://ubuntu.com/security/notices/USN-4877-1");
  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:H/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-2020-36158");

  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:"2021/01/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1013-dell300x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1066-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1080-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1086-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1094-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1095-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1097-snapdragon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1109-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-137-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-137-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-137-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-aws-hwe");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-aws-lts-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-azure-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-azure-lts-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-dell300x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp-lts-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-16.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-16.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-16.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oem");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle-lts-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-snapdragon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-16.04-edge");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2021 Canonical, Inc. / NASL script (C) 2021 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/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('audit.inc');
include('ubuntu.inc');
include('ksplice.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item('Host/Ubuntu/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
release = chomp(release);
if (! preg(pattern:"^(16\.04|18\.04)$", string:release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', 'Ubuntu ' + release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  rm_kb_item(name:'Host/uptrack-uname-r');
  cve_list = make_list('CVE-2020-36158', 'CVE-2021-3178');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4877-1');
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

pkgs = [
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-1066-oracle', 'pkgver': '4.15.0-1066.74~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-1094-gcp', 'pkgver': '4.15.0-1094.107~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-1095-aws', 'pkgver': '4.15.0-1095.102~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-1109-azure', 'pkgver': '4.15.0-1109.121~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-137-generic', 'pkgver': '4.15.0-137.141~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-137-generic-lpae', 'pkgver': '4.15.0-137.141~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-137-lowlatency', 'pkgver': '4.15.0-137.141~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-aws-hwe', 'pkgver': '4.15.0.1095.88'},
    {'osver': '16.04', 'pkgname': 'linux-image-azure', 'pkgver': '4.15.0.1109.100'},
    {'osver': '16.04', 'pkgname': 'linux-image-azure-edge', 'pkgver': '4.15.0.1109.100'},
    {'osver': '16.04', 'pkgname': 'linux-image-gcp', 'pkgver': '4.15.0.1094.95'},
    {'osver': '16.04', 'pkgname': 'linux-image-generic-hwe-16.04', 'pkgver': '4.15.0.137.133'},
    {'osver': '16.04', 'pkgname': 'linux-image-generic-hwe-16.04-edge', 'pkgver': '4.15.0.137.133'},
    {'osver': '16.04', 'pkgname': 'linux-image-generic-lpae-hwe-16.04', 'pkgver': '4.15.0.137.133'},
    {'osver': '16.04', 'pkgname': 'linux-image-generic-lpae-hwe-16.04-edge', 'pkgver': '4.15.0.137.133'},
    {'osver': '16.04', 'pkgname': 'linux-image-gke', 'pkgver': '4.15.0.1094.95'},
    {'osver': '16.04', 'pkgname': 'linux-image-lowlatency-hwe-16.04', 'pkgver': '4.15.0.137.133'},
    {'osver': '16.04', 'pkgname': 'linux-image-lowlatency-hwe-16.04-edge', 'pkgver': '4.15.0.137.133'},
    {'osver': '16.04', 'pkgname': 'linux-image-oem', 'pkgver': '4.15.0.137.133'},
    {'osver': '16.04', 'pkgname': 'linux-image-oracle', 'pkgver': '4.15.0.1066.54'},
    {'osver': '16.04', 'pkgname': 'linux-image-virtual-hwe-16.04', 'pkgver': '4.15.0.137.133'},
    {'osver': '16.04', 'pkgname': 'linux-image-virtual-hwe-16.04-edge', 'pkgver': '4.15.0.137.133'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1013-dell300x', 'pkgver': '4.15.0-1013.17'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1066-oracle', 'pkgver': '4.15.0-1066.74'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1080-raspi2', 'pkgver': '4.15.0-1080.85'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1086-kvm', 'pkgver': '4.15.0-1086.88'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1094-gcp', 'pkgver': '4.15.0-1094.107'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1095-aws', 'pkgver': '4.15.0-1095.102'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1097-snapdragon', 'pkgver': '4.15.0-1097.106'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1109-azure', 'pkgver': '4.15.0-1109.121'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-137-generic', 'pkgver': '4.15.0-137.141'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-137-generic-lpae', 'pkgver': '4.15.0-137.141'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-137-lowlatency', 'pkgver': '4.15.0-137.141'},
    {'osver': '18.04', 'pkgname': 'linux-image-aws-lts-18.04', 'pkgver': '4.15.0.1095.98'},
    {'osver': '18.04', 'pkgname': 'linux-image-azure-lts-18.04', 'pkgver': '4.15.0.1109.82'},
    {'osver': '18.04', 'pkgname': 'linux-image-dell300x', 'pkgver': '4.15.0.1013.15'},
    {'osver': '18.04', 'pkgname': 'linux-image-gcp-lts-18.04', 'pkgver': '4.15.0.1094.112'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-hwe-16.04', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-hwe-16.04-edge', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-lpae', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-lpae-hwe-16.04', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-lpae-hwe-16.04-edge', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-kvm', 'pkgver': '4.15.0.1086.82'},
    {'osver': '18.04', 'pkgname': 'linux-image-lowlatency', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-lowlatency-hwe-16.04', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-lowlatency-hwe-16.04-edge', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-oracle-lts-18.04', 'pkgver': '4.15.0.1066.76'},
    {'osver': '18.04', 'pkgname': 'linux-image-raspi2', 'pkgver': '4.15.0.1080.77'},
    {'osver': '18.04', 'pkgname': 'linux-image-snapdragon', 'pkgver': '4.15.0.1097.100'},
    {'osver': '18.04', 'pkgname': 'linux-image-virtual', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-virtual-hwe-16.04', 'pkgver': '4.15.0.137.124'},
    {'osver': '18.04', 'pkgname': 'linux-image-virtual-hwe-16.04-edge', 'pkgver': '4.15.0.137.124'}
];

flag = 0;
foreach package_array ( pkgs ) {
  osver = NULL;
  pkgname = NULL;
  pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'linux-image-4.15.0-1013-dell300x / linux-image-4.15.0-1066-oracle / etc');
}