RancherOS < 1.4.1 Multiple Information Disclosure Vulnerabilities

#
# (C) Tenable Network Security, Inc.
#
# @NOAGENT@

include('compat.inc');

if (description)
{
  script_id(132253);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/04/15");

  script_cve_id("CVE-2018-3620", "CVE-2018-3639");
  script_bugtraq_id(104232, 105080);

  script_name(english:"RancherOS < 1.4.1 Multiple Information Disclosure Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
  script_set_attribute(attribute:"description", value:
"The remote host is running a version of RancherOS prior to v1.4.1, hence is exposed
to multiple side-channel vulnerabilities:

  - Systems with microprocessors utilizing speculative
    execution and address translations may allow unauthorized
    disclosure of information residing in the L1 data cache
    to an attacker with local user access via a terminal page
    fault and a side-channel analysis. (CVE-2018-3620)

  - Systems with microprocessors utilizing speculative
    execution and speculative execution of memory reads
    before the addresses of all prior memory writes are known
    may allow unauthorized disclosure of information to an
    attacker with local user access via a side-channel
    analysis, aka Speculative Store Bypass (SSB), Variant 4.
    (CVE-2018-3639)");
  script_set_attribute(attribute:"see_also", value:"https://rancher.com/docs/os/v1.x/en/about/security/");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rancher/os/releases/tag/v1.4.1");
  script_set_attribute(attribute:"solution", value:
"Upgrade to RancherOS v1.4.1 or later");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-3620");

  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:"2018/05/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/09/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:rancher:rancheros");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2019-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "os_fingerprint_linux_distro.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RancherOS/version", "Host/RancherOS");

  exit(0);
}

include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

# Fix version is v0.8.1
fix_version = '1.4.1';
os = get_kb_item('Host/RancherOS');

if (!os) audit(AUDIT_OS_NOT, 'RancherOS');

os_ver = get_kb_item('Host/RancherOS/version');
if (!os_ver)
{
  exit(1, 'Could not determine the RancherOS version');
}

match = pregmatch(pattern:"v([0-9\.]+)", string:os_ver);

if (!isnull(match))
{ 
  version = match[1]; 
  if (ver_compare(ver:version, fix:fix_version, strict:TRUE) == -1)
  {
    security_report_v4(
      port:0,
      severity:SECURITY_WARNING,
      extra:
        '\n  Installed version : ' + os_ver +
        '\n  Fixed version     : v' + fix_version +
        '\n'
    );
  }
}

audit(AUDIT_INST_VER_NOT_VULN, 'RancherOS', os_ver);