Vim < 9.2.0565 Out-of-Bounds Read (GHSA-47gw-8gc3-mgcm)

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

include('compat.inc');

if (description)
{
  script_id(321507);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/18");

  script_cve_id("CVE-2026-52859");

  script_name(english:"Vim < 9.2.0565 Out-of-Bounds Read (GHSA-47gw-8gc3-mgcm)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of Vim installed on the remote host is prior to 9.2.0565. It is, therefore, affected by a vulnerability
as referenced in the GHSA-47gw-8gc3-mgcm advisory.

  - The update_snapshot() function in src/terminal.c copies the visible terminal screen into the scrollback
    buffer when a snapshot is taken. For each screen cell it walks the cell's chars[] array with no upper
    bound, stopping only when it encounters a NUL terminator. When a cell legitimately fills all
    VTERM_MAX_CHARS_PER_CELL (6) slots, the bundled libvterm returns the array without a terminating NUL, so
    the loop reads past the fixed six-element array and appends the out-of-bounds values to a buffer reserved
    for only six characters. A program whose output is rendered inside a :terminal window can trigger this
    with a short byte sequence and no Vim scripting, leading to a crash. (CVE-2026-52859)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://github.com/vim/vim/security/advisories/GHSA-47gw-8gc3-mgcm
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d643a86c");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Vim version 9.2.0565 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-52859");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:vim:vim");
  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' : '9.2.0565' }
      ]
    }
  ]
};

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