F5 Networks BIG-IP : BIG-IP SCP vulnerability (K82518062)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K82518062.
#
# The text description of this plugin is (C) F5 Networks.
#

include('compat.inc');

if (description)
{
  script_id(137919);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/03");

  script_cve_id("CVE-2020-5906");
  script_xref(name:"IAVA", value:"2020-A-0283-S");

  script_name(english:"F5 Networks BIG-IP : BIG-IP SCP vulnerability (K82518062)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"The BIG-IP system does not properly enforce the access controls for
the scp.blacklist files. This allows Admin and Resource Admin users
with Secure Copy (SCP) protocol access to read and overwrite
blacklisted files via SCP.(CVE-2020-5906)

Note : F5 is working to eliminate exclusionary language in our
products and documentation. For more information, refer toK34150231:
Exclusionary language in F5 products and documentation.

Impact

Authenticated users with access to the SCP utility, which is an
OpenSSH tool, but without full file system or Advanced Shell ( bash )
access, can read and overwrite certain configuration files that are
otherwise restricted through SCP.");
  script_set_attribute(attribute:"see_also", value:"https://my.f5.com/manage/s/article/K82518062");
  script_set_attribute(attribute:"solution", value:
"Upgrade to one of the non-vulnerable versions listed in the F5 Solution K82518062.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N");
  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:L/UI:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-5906");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/07/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_access_policy_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_advanced_firewall_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_acceleration_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_security_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_visibility_and_reporting");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_domain_name_system");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_global_traffic_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_link_controller");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_local_traffic_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_policy_enforcement_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:f5:big-ip");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"F5 Networks Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("f5_bigip_detect.nbin");
  script_require_keys("Host/local_checks_enabled", "Host/BIG-IP/hotfix", "Host/BIG-IP/modules", "Host/BIG-IP/version");

  exit(0);
}


include('f5_func.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var version = get_kb_item('Host/BIG-IP/version');
if ( ! version ) audit(AUDIT_OS_NOT, 'F5 Networks BIG-IP');
if ( isnull(get_kb_item('Host/BIG-IP/hotfix')) ) audit(AUDIT_KB_MISSING, 'Host/BIG-IP/hotfix');
if ( ! get_kb_item('Host/BIG-IP/modules') ) audit(AUDIT_KB_MISSING, 'Host/BIG-IP/modules');

var sol = 'K82518062';
var vmatrix = {
  'AFM': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'AM': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'APM': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'ASM': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'AVR': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'DNS': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'GTM': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'LC': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'LTM': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  },
  'PEM': {
    'affected': [
      '13.1.0-13.1.3','12.1.0-12.1.5','11.6.1-11.6.5'
    ],
    'unaffected': [
      '14.0.0','13.1.3.4','12.1.5.2'
    ],
  }
};

if (bigip_is_affected(vmatrix:vmatrix, sol:sol))
{
  var extra = NULL;
  if (report_verbosity > 0) extra = bigip_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : extra
  );
}
else
{
  var tested = bigip_get_tested_modules();
  var audit_extra = 'For BIG-IP module(s) ' + tested + ',';
  if (tested) audit(AUDIT_INST_VER_NOT_VULN, audit_extra, version);
  else audit(AUDIT_HOST_NOT, 'running any of the affected modules');
}