Ubuntu 16.04 ESM : Salt vulnerabilities (USN-4769-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4769-1. 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(183538);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2014-3563",
    "CVE-2015-6918",
    "CVE-2015-6941",
    "CVE-2017-12791",
    "CVE-2017-14695",
    "CVE-2017-14696",
    "CVE-2018-15750",
    "CVE-2018-15751"
  );
  script_xref(name:"USN", value:"4769-1");

  script_name(english:"Ubuntu 16.04 ESM : Salt vulnerabilities (USN-4769-1)");

  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 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in
the USN-4769-1 advisory.

    It was discovered that Salt allowed remote attackers to write to arbitrary files via a special crafted
    file. An attacker could use this vulnerability to cause a DoS or possibly execute arbitrary code. This
    issue only affected Ubuntu 14.04 ESM. (CVE-2014-3563)

    Andreas Stieger discovered that Salt exposed git usernames and passwords in log files. An attacker could
    use this issue to retrieve sensitive information. This issue only affected Ubuntu 14.04 ESM.
    (CVE-2015-6918).

    It was discovered that Salt exposed password authentication credentials in log files. An attacker could
    use this issue to retrieve sensitive information. This issue only affected Ubuntu 14.04 ESM.
    (CVE-2015-6941)

    It was discovered that Salt allowed remote attackers to write to arbitrary files via a special crafted
    file. An attacker could use this

    issue to cause a DoS or possibly execute arbitrary code. (CVE-2017-12791, CVE-2017-14695, CVE-2017-14696)

    It was discovered that Salt allowed remote attackers to determine which files exist on the server. An
    attacker could use this issue to extract sensitive information. This issue only affected Ubuntu 16.04 ESM.
    (CVE-2018-15750)

    It was discovered that Salt allowed users to bypass authentication. An attacker could use this issue to
    extract sensitive information, execute arbitrary code or crash the server. This issue only affected Ubuntu
    16.04 ESM. (CVE-2018-15751)

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-4769-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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-2018-15751");

  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:"2014/08/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:esm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:salt-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:salt-cloud");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:salt-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:salt-master");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:salt-minion");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:salt-proxy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:salt-ssh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:salt-syndic");
  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) 2023-2024 Canonical, Inc. / NASL script (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.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)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04', '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 ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '16.04', 'pkgname': 'salt-api', 'pkgver': '2015.8.8+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'salt-cloud', 'pkgver': '2015.8.8+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'salt-common', 'pkgver': '2015.8.8+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'salt-master', 'pkgver': '2015.8.8+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'salt-minion', 'pkgver': '2015.8.8+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'salt-proxy', 'pkgver': '2015.8.8+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'salt-ssh', 'pkgver': '2015.8.8+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'salt-syndic', 'pkgver': '2015.8.8+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE}
];

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'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  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, 'salt-api / salt-cloud / salt-common / salt-master / salt-minion / etc');
}