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("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  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:
"The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-4470-1 advisory.

    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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues 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-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) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 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 var 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)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  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');
}