Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : sane-backends vulnerabilities (USN-4470-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4470-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(139783);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/21");

  script_cve_id(
    "CVE-2017-6318",
    "CVE-2020-12861",
    "CVE-2020-12862",
    "CVE-2020-12863",
    "CVE-2020-12864",
    "CVE-2020-12865",
    "CVE-2020-12866",
    "CVE-2020-12867"
  );
  script_xref(name:"USN", value:"4470-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : sane-backends vulnerabilities (USN-4470-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"Kritphong Mongkhonvanit discovered that sane-backends incorrectly
handled certain packets. A remote attacker could possibly use this
issue to obtain sensitive memory information. This issue only affected
Ubuntu 16.04 LTS. (CVE-2017-6318) It was discovered that sane-backends
incorrectly handled certain memory operations. A remote attacker could
possibly use this issue to execute arbitrary code. This issue only
applied to Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-12861) It
was discovered that sane-backends incorrectly handled certain memory
operations. A remote attacker could possibly use this issue to obtain
sensitive information. (CVE-2020-12862, CVE-2020-12863) It was
discovered that sane-backends incorrectly handled certain memory
operations. A remote attacker could possibly use this issue to obtain
sensitive information. This issue only applied to Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2020-12864) It was discovered that
sane-backends incorrectly handled certain memory operations. A remote
attacker could possibly use this issue to execute arbitrary code.
(CVE-2020-12865) It was discovered that sane-backends incorrectly
handled certain memory operations. A remote attacker could possibly
use this issue to cause a denial of service. This issue only applied
to Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-12866) It was
discovered that sane-backends incorrectly handled certain memory
operations. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2020-12867).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-4470-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:M/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:N/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-2020-12861");

  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:"2017/03/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/08/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/08/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsane");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsane-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsane-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsane1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sane-utils");
  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:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2020-2023 Canonical, Inc. / NASL script (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '16.04', 'pkgname': 'libsane', 'pkgver': '1.0.25+git20150528-1ubuntu2.16.04.3'},
    {'osver': '16.04', 'pkgname': 'libsane-common', 'pkgver': '1.0.25+git20150528-1ubuntu2.16.04.3'},
    {'osver': '16.04', 'pkgname': 'libsane-dev', 'pkgver': '1.0.25+git20150528-1ubuntu2.16.04.3'},
    {'osver': '16.04', 'pkgname': 'sane-utils', 'pkgver': '1.0.25+git20150528-1ubuntu2.16.04.3'},
    {'osver': '18.04', 'pkgname': 'libsane-common', 'pkgver': '1.0.27-1~experimental3ubuntu2.3'},
    {'osver': '18.04', 'pkgname': 'libsane-dev', 'pkgver': '1.0.27-1~experimental3ubuntu2.3'},
    {'osver': '18.04', 'pkgname': 'libsane1', 'pkgver': '1.0.27-1~experimental3ubuntu2.3'},
    {'osver': '18.04', 'pkgname': 'sane-utils', 'pkgver': '1.0.27-1~experimental3ubuntu2.3'},
    {'osver': '20.04', 'pkgname': 'libsane', 'pkgver': '1.0.29-0ubuntu5.1'},
    {'osver': '20.04', 'pkgname': 'libsane-common', 'pkgver': '1.0.29-0ubuntu5.1'},
    {'osver': '20.04', 'pkgname': 'libsane-dev', 'pkgver': '1.0.29-0ubuntu5.1'},
    {'osver': '20.04', 'pkgname': 'libsane1', 'pkgver': '1.0.29-0ubuntu5.1'},
    {'osver': '20.04', 'pkgname': 'sane-utils', 'pkgver': '1.0.29-0ubuntu5.1'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var 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
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libsane / libsane-common / libsane-dev / libsane1 / sane-utils');
}