Python Library Tornado < 6.5.6 Multiple Vulnerabilities

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

include('compat.inc');

if (description)
{
  script_id(321525);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/22");

  script_cve_id("CVE-2026-49853", "CVE-2026-49855");
  script_xref(name:"IAVB", value:"2026-B-0166");

  script_name(english:"Python Library Tornado < 6.5.6 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"A Python library installed on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of the Tornado Python library installed on the remote host is prior to 6.5.6. It is, therefore,
affected by multiple vulnerabilities:

  - When SimpleAsyncHTTPClient follows a 3xx redirect, it shallow-copies the original HTTPRequest, rewrites
    the URL, decrements max_redirects, and removes only the Host header. It does not clear Authorization,
    auth_username, auth_password, or auth_mode when the redirect target changes origin. As a result,
    credentials intended for one origin can be forwarded to a different origin when follow_redirects=True,
    which is the default. (CVE-2026-49853)

  - Tornado's gzip decompression routines work in limited-size chunks, but have no overall limit for the
    total size of decompressed chunks that they will accumulate (There has always been a limit for the total
    compressed size). This allows a malicious server to consume effectively unlimited amounts of memory if
    it is accessed via SimpleAsyncHTTPClient in its default configuration. (CVE-2026-49855)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported
version number.");
  # https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?59b729ba");
  # https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a7552069");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Tornado version 6.5.6 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/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:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-49855");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-49853");

  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:"2026/05/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"asset_categories", value:"component");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:tornadoweb:tornado");
  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("python_tornado_detect.nbin");
  script_require_keys("installed_sw/tornado");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'tornado', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '6.5.6'}
      ]
    }
  ]
};

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