Progress Telerik Fiddler Classic < 6.0.20262.10021 Multiple Vulnerabilities

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

include('compat.inc');

if (description)
{
  script_id(364359);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/09");

  script_cve_id(
    "CVE-2026-77802",
    "CVE-2026-77803",
    "CVE-2026-77804",
    "CVE-2026-77805"
  );
  script_xref(name:"IAVB", value:"2026-B-0291");

  script_name(english:"Progress Telerik Fiddler Classic < 6.0.20262.10021 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of Progress Telerik Fiddler Classic installed on the remote Windows host is prior to
6.0.20262.10021. It is, therefore, affected by multiple vulnerabilities:

  - An insufficient integrity check on external helper tools allows a local low-privileged attacker to
    replace a helper executable with any validly signed binary from an allowed publisher and have it
    executed by the application, including with administrator privileges, resulting in privilege
    escalation. (CVE-2026-77805)

  - A time-of-check time-of-use (TOCTOU) race condition exists in the HTTPS interception root certificate
    installation process. A local attacker with low privileges can substitute the temporary certificate
    file between write and import, causing an attacker-controlled certificate to be installed in the
    Local Computer Trusted Root store, enabling TLS traffic interception. (CVE-2026-77804)

  - An HTTP request smuggling vulnerability exists in the proxy request forwarding component due to
    inconsistent interpretation of conflicting Content-Length headers. A low-privileged local attacker
    sharing the same proxy instance may exploit connection reuse to poison responses delivered to other
    users. (CVE-2026-77802)

Note that Nessus has not tested for these issues but has instead relied only on the application's
self-reported version number.");

  # https://docs.telerik.com/fiddler/knowledge-base/kb-security-front-end-desynchronization-cve-2026-77803
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?31ba4a50");
  # https://docs.telerik.com/fiddler/knowledge-base/kb-security-weak-executable-signature-verification-cve-2026-77805
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?70587cd2");
  # https://www.telerik.com/fiddler/fiddler-classic/documentation/knowledge-base/kb-security-http-request-smuggling-cve-2026-77802
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7b97fbb4");
  # https://www.telerik.com/fiddler/fiddler-classic/documentation/knowledge-base/kb-security-root-certificate-installation-toctou-cve-2026-77804
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?be4d5c72");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Progress Telerik Fiddler Classic version 6.0.20262.10021 or later.");
  script_set_attribute(attribute:"agent", value:"windows");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-77805");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:progress:telerik_fiddler_classic");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("progress_telerik_fiddler_classic_win_installed.nbin");
  script_require_keys("installed_sw/Progress Telerik Fiddler Classic", "SMB/Registry/Enumerated");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'Progress Telerik Fiddler Classic', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '6.0.20262.10021'}
      ]
    }
  ]
};

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