Vim < 9.2.0662 Stack Out-of-Bounds Write (GHSA-qm9w-fmpj-879h)

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

include('compat.inc');

if (description)
{
  script_id(324728);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/06");

  script_cve_id("CVE-2026-55892");
  script_xref(name:"IAVA", value:"2026-A-0630");

  script_name(english:"Vim < 9.2.0662 Stack Out-of-Bounds Write (GHSA-qm9w-fmpj-879h)");

  script_set_attribute(attribute:"synopsis", value:
"A text editor installed on the remote host is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Vim installed on the remote host is prior to 9.2.0662. It is, therefore, affected by a vulnerability.

  - The dump_prefixes() function in src/spell.c walks a spell-file prefix trie iteratively with a depth counter while
    dumping the prefixes that apply to a word. The counter is bounded only by the trie structure itself; it is never
    checked against the size of the fixed MAXWLEN-element stack arrays it indexes (prefix[], arridx[], curi[]). A
    crafted .spl file, loaded when the user dumps the word list, can drive the descent arbitrarily deep, so the
    function writes past the end of those arrays. This is a stack out-of-bounds write that corrupts the call frame and
    crashes the editor. (CVE-2026-55892)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://github.com/vim/vim/security/advisories/GHSA-qm9w-fmpj-879h");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Vim version 9.2.0662 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-2026-55892");

  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:"2026/06/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:vim:vim");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  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("vim_win_installed.nbin", "vim_nix_installed.nbin");
  script_require_keys("installed_sw/Vim");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Vim', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints' : [
        { 'fixed_version' : '9.2.0662' }
      ]
    }
  ]
};

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