Ruby oj Gem < 3.17.2 Stack Buffer Overflow

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

include('compat.inc');

if (description)
{
  script_id(333329);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/10");

  script_cve_id("CVE-2026-54502");
  script_xref(name:"IAVB", value:"2026-B-0222");

  script_name(english:"Ruby oj Gem < 3.17.2 Stack Buffer Overflow");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has a module installed that is affected by a stack buffer overflow vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of the oj Ruby gem installed on the remote host is prior to 3.17.2. It is, therefore, affected by
a stack buffer overflow vulnerability.

  - Oj.dump is vulnerable to a stack-based buffer overflow when a large :indent value is provided by the
    developer. fill_indent in dump.h calls memset(indent_str, ' ', (size_t)opts->indent) without validating
    the size. When opts->indent is set to INT_MAX (2,147,483,647), the (size_t) cast preserves the large
    value and memset writes 2 GB into the stack-allocated out buffer (4,184 bytes), corrupting the stack and
    crashing the process. (CVE-2026-54502)

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/ohler55/oj/security/advisories/GHSA-3v45-f3vh-wg7m");
  script_set_attribute(attribute:"solution", value:
"Upgrade to oj version 3.17.2 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-54502");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(121);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ohler55:oj");
  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("ruby_modules_nix_installed.nbin", "ruby_gem_modules_macos_installed.nbin", "ruby_modules_win_installed.nbin");
  script_require_keys("Host/ruby/modules/enumerated");

  exit(0);
}

include('ruby.inc');

var gem_name = 'oj';
var app_info = ruby_gems::get_app_info(app:gem_name);

if (empty_or_null(app_info))
  audit(AUDIT_NOT_INST, gem_name);

vcf::check_all_backporting(app_info:app_info);

var constraints = [
  {'fixed_version': '3.17.2'}
];

vcf::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE
);