Tenable Nessus 8.9.0 < 8.13.2 Multiple Vulnerabilities (TNS-2021-05)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(148297);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/05");

  script_cve_id("CVE-2021-3449", "CVE-2021-3450");
  script_xref(name:"IAVA", value:"2021-A-0149-S");
  script_xref(name:"CEA-ID", value:"CEA-2021-0025");

  script_name(english:"Tenable Nessus 8.9.0 < 8.13.2 Multiple Vulnerabilities (TNS-2021-05)");

  script_set_attribute(attribute:"synopsis", value:
"Tenable Nessus running on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the Tenable Nessus application running on the remote host is 8.9.0 prior to 
8.13.2. It is, therefore, affected by multiple vulnerabilities:

  - An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a
    client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was
    present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL
    pointer dereference will result, leading to a crash and a denial of service attack. A server is only
    vulnerable if it has TLSv1.2 and renegotiation enabled. (CVE-2021-3449)

  - The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a
    certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow
    certificates in the chain that have explicitly encoded elliptic curve parameters was added as an
    additional strict check. An error in the implementation of this check meant that the result of a previous
    check to confirm that certificates in the chain are valid CA certificates was overwritten. This
    effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a
    'purpose' has been configured then there is a subsequent opportunity for checks that the certificate is a
    valid CA. All of the named 'purpose' values implemented in libcrypto perform this check. Therefore, where
    a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A
    purpose is set by default in libssl client and server certificate verification routines, but it can be
    overridden or removed by an application. In order to be affected, an application must explicitly set the
    X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification
    or, in the case of TLS client or server applications, override the default purpose. (CVE-2021-3450)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version   
number.");
  # https://www.securityweek.com/openssl-111k-patches-two-high-severity-vulnerabilities
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4ceab20f");
  script_set_attribute(attribute:"see_also", value:"https://www.tenable.com/security/tns-2021-05");
  script_set_attribute(attribute:"see_also", value:"https://www.openssl.org/news/vulnerabilities.html#CVE-2021-3449");
  script_set_attribute(attribute:"see_also", value:"https://www.openssl.org/news/vulnerabilities.html#CVE-2021-3450");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Tenable Nessus version 8.13.2 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3450");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/04/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/02");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:tenable:nessus");
  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) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("nessus_detect.nasl", "nessus_installed_win.nbin", "nessus_installed_linux.nbin", "macos_nessus_installed.nbin");
  script_require_keys("installed_sw/Tenable Nessus");

  exit(0);
}

include('vcf_extras.inc');

var app_info, constraints;

app_info = vcf::combined_get_app_info(app:'Tenable Nessus');

vcf::check_granularity(app_info:app_info, sig_segments:3);

constraints = [
  { 'min_version' : '8.9.0', 'fixed_version' : '8.13.2' }
];

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