Arista Networks EOS Security Update (SA0140)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(318805);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/05");

  script_cve_id("CVE-2026-10040");
  script_xref(name:"IAVA", value:"2026-A-0545");

  script_name(english:"Arista Networks EOS Security Update (SA0140)");

  script_set_attribute(attribute:"synopsis", value:
"The version of Arista Networks EOS running on the remote device is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Arista Networks EOS running on the remote device is affected by a vulnerability as referenced in
security advisory SA0140.

  - A user with local eos-admin privileges on affected Arista EOS (Extensible Operating System) platforms 
    where secure boot is enabled can bypass Secure Boot Software Image (SWI) verification through the use of 
    a specially crafted file.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported
version number.");
  # https://www.arista.com/en/support/advisories-notices/security-advisory/24074-security-advisory-0140
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e779cd96");
  script_set_attribute(attribute:"solution", value:
"Apply the patch or upgrade to a fixed version as referenced in the vendor advisory.");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-10040");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/05");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:arista:eos");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("arista_eos_detect.nbin");
  script_require_keys("Host/Arista-EOS/Version", "Host/Arista-EOS/model", "Settings/ParanoidReport");

  exit(0);
}

include('arista_eos_func.inc');

# added paranoia not doing config check
if (report_paranoia < 2)
  audit(AUDIT_PARANOID);

var version = get_kb_item_or_exit('Host/Arista-EOS/Version');
var model = toupper(get_kb_item_or_exit('Host/Arista-EOS/model'));

if (model !~ ".*7289-SUP.*" &&
    model !~ ".*7300-SUP.*" &&
    model !~ ".*7388-SUP.*" &&
    model !~ ".*AWE-(5[35]10|72[235]0).*" &&
    model !~ ".*CCS-(710|720|722|750).*" &&
    model !~ ".*DCS-70(01|10|50|60).*" &&
    model !~ ".*DCS-71(3[025]|70).*" &&
    model !~ ".*DCS-7280.*" &&
    model !~ ".*DCS-78(00|16).*" &&
    model !~ ".*ZTX-72[35]0.*")
    audit(AUDIT_HOST_NOT, 'an affected model');

var vmatrix = make_array();
vmatrix['F']   =  make_list('0.0<=4.35.1');
vmatrix['M']   =  make_list('4.34.0<=4.34.5',
                            '4.33.0<=4.33.7',
                            '4.32.0<=4.32.9',
                            '4.31.0<=4.31.10',
                            '4.30.0<=4.30.10');
vmatrix['fix'] = '4.34.6M / 4.33.8M / 4.32.10M / 4.35.2F';

if (eos_is_affected(vmatrix:vmatrix, version:version))
  security_report_v4(severity:SECURITY_WARNING, port:0, extra:eos_report_get());
else
  audit(AUDIT_INST_VER_NOT_VULN, 'Arista Networks EOS', version);