Ruby net-imap < 0.4.24 / 0.5.x < 0.5.14 / 0.6.x < 0.6.4 Multiple Vulnerabilities

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

include('compat.inc');

if (description)
{
  script_id(313278);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/19");

  script_cve_id("CVE-2026-42245", "CVE-2026-42257", "CVE-2026-42258");
  script_xref(name:"IAVB", value:"2026-B-0117");

  script_name(english:"Ruby net-imap < 0.4.24 / 0.5.x < 0.5.14 / 0.6.x < 0.6.4 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has a module installed that is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of the net-imap Ruby library installed on the remote host is prior to 0.4.24, 0.5.x prior to 0.5.14, 
or 0.6.x prior to 0.6.4. It is, therefore, affected by multiple vulnerabilities.

- The Net::IMAP::ResponseReader component is affected by a quadratic time complexity flaw when parsing large server 
responses containing numerous string literals. A malicious IMAP server can exploit this issue via crafted responses to 
exhaust client CPU resources and cause a denial of service. (CVE-2026-42245)

- Several Net::IMAP commands fail to properly validate or escape raw string arguments. If these strings incorporate 
user-controlled data, an attacker can use injected CRLF sequences to execute arbitrary IMAP commands. (CVE-2026-42257)

- Symbol arguments passed to IMAP commands are susceptible to CRLF/IMAP command injection. This vulnerability allows for
the injection of arbitrary IMAP commands via specially crafted Symbol arguments. (CVE-2026-42258)

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/advisories/GHSA-q2mw-fvj9-vvcw");
  script_set_attribute(attribute:"see_also", value:"https://github.com/advisories/GHSA-hm49-wcqc-g2xg");
  script_set_attribute(attribute:"see_also", value:"https://github.com/advisories/GHSA-75xq-5h9v-w6px");
  script_set_attribute(attribute:"solution", value:
"Upgrade to net-imap version 0.4.24, 0.5.14, or 0.6.4.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:H/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-2026-42258");

  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:"2026/04/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ruby:net-imap");
  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 = 'net-imap';
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 = [
  {'min_version': '0', 'max_version': '0.4.23', 'fixed_version': '0.4.24'},
  {'min_version': '0.5.0', 'max_version': '0.5.13', 'fixed_version': '0.5.14'},
  {'min_version': '0.6.0', 'max_version': '0.6.3', 'fixed_version': '0.6.4'}
];

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