EXOS < 31.7.4 / 32.0.0 < 32.7.4.15 / 33.0.0 < 33.1.100, 33.7.0 < 33.7.1 Privilege Escalation (SA-2026-088)

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

include('compat.inc');

if (description)
{
  script_id(350290);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/25");

  script_cve_id("CVE-2026-8170");

  script_name(english:"EXOS < 31.7.4 / 32.0.0 < 32.7.4.15 / 33.0.0 < 33.1.100, 33.7.0 < 33.7.1 Privilege Escalation (SA-2026-088)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has a program that is affected by an privilege escalation vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of EXOS installed on the remote host is missing a security update. It is, therefore, affected by an
privilege escalation vulnerability.

  - ExtremeXOS shell environment utilities fail to safely canonicalize paths and can follow symbolic links
    from a writable user directory to a privileged location (such as /dev) and then invoke those utilities
	outside of their authorized scope. Exploitation is possible remotely by an attacker holding an admin
	account, or locally via the serial console.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");

  #https://community.extremenetworks.com/t5/security-advisories-formerly/sa-2026-088-extremexos-privilege-escalation-via-symlink/ba-p/122283
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d12b845e");
  script_set_attribute(attribute:"see_also", value:"https://extreme-networks.my.site.com/ExtrArticleDetail?an=000137696");
  script_set_attribute(attribute:"solution", value:
"Upgrade EXOS to 31.7.4, 32.7.4.15, 33.1.100, 33.7.1 or later");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-8170");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/25");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:extremenetworks:extremexos");
  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("extreme_networks_exos_web_detect.nbin", "extreme_networks_exos.nbin");
  script_require_keys("installed_sw/Extreme Networks ExtremeXOS");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Extreme Networks ExtremeXOS', 'type': 'os'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '31.7.4'},
        {'min_version': '32.0.0', 'fixed_version': '32.7.4.15'},
        {'min_version': '33.0.0', 'fixed_version': '33.1.100'},
        {'min_version': '33.7.0', 'fixed_version': '33.7.1'}
      ]
    }
  ]
};

var res = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE);
vdf::handle_check_and_report_errors(vdf_result:res);