Barracuda Email Security Gateway < 9.2.0.008 Command Injection (CVE-2023-2868)

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

include('compat.inc');

if (description)
{
  script_id(177587);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/08/31");

  script_cve_id("CVE-2023-2868");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2023/06/16");
  script_xref(name:"CEA-ID", value:"CEA-2023-0041");

  script_name(english:"Barracuda Email Security Gateway < 9.2.0.008 Command Injection (CVE-2023-2868)");

  script_set_attribute(attribute:"synopsis", value:
"A web application running on the remote server is affected by a command injection vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the Barracuda Email Security Gateway on the remote web server is < 9.2.0.008.
It is, therefore, affected by a command injection vulnerability in the processing of .tar files that could allow a
remote, unauthenticated attacker to execute arbitrary commands with the privileges of the Email Security Gateway.

Barracuda released guidance on May 31, 2023 on the continued exploitation of this vulnerability on small number of 
already compromised ESG appliances. It urges to discontinue the use of the compromised ESG appliances and to contact 
Barracuda support to obtain a new ESG virtual or hardware appliance.

The FBI has independently verified that all exploited ESG appliances, even those with patches pushed out by Barracuda, 
remain at risk for continued computer network compromise from suspected PRC cyber actors exploiting this vulnerability.
It issued a flash alert on Aug 24, 2023 reinforcing Barracuda's warning where it strongly advises all affected ESG 
appliances to be isolated and replaced immediately, and all networks scanned for connections to the provided list of 
indicators of compromise.

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://www.barracuda.com/company/legal/esg-vulnerability");
  script_set_attribute(attribute:"see_also", value:"https://status.barracuda.com/incidents/34kx82j5n4q9");
  # https://campus.barracuda.com/product/emailsecuritygateway/doc/11141920/release-notes/#_9c1293a2
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?44bea323");
  # https://www.bleepingcomputer.com/news/security/fbi-warns-of-patched-barracuda-esg-appliances-still-being-hacked/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?731e407f");
  # https://www.cisa.gov/news-events/alerts/2023/07/28/cisa-releases-malware-analysis-reports-barracuda-backdoors
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?28018ade");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Barracuda Email Security Gateway 9.2.0.008 or later.");
  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:H/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:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-2868");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/05/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/05/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/06/23");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:barracuda:email_security_gateway");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("barracuda_email_security_gateway_service_detect.nbin");
  script_require_keys("installed_sw/Barracuda Email Security Gateway");
  script_require_ports("Services/www", 443);

  exit(0);
}

include('vcf.inc');
include('http.inc');

var port = get_http_port(default:443);

var app_info = vcf::get_app_info(app:'Barracuda Email Security Gateway', port:port, webapp:TRUE);

var constraints = [
  {'min_version':'5.1.3.001', 'fixed_version':'9.2.0.008'}
];

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