Sendmail Crafted ETRN Commands Remote DoS

#
# (C) Tenable Network Security, Inc.
# Original script by Xue Yong Zhi <[email protected]>
#
# Changes by Tenable:
# - Revised plugin title, output formatting (9/14/09)
# - Updated to use compat.inc, added CVSS score (11/20/2009)
# - Fixed typo in the solution (03/05/2014)
# - rewritten by Tenable (7/13/2018)

include("compat.inc");

if (description)
{
  script_id(11350);
  script_version("1.19");
  script_cvs_date("Date: 2018/09/17 21:46:53");

  script_cve_id("CVE-1999-1109");
  script_bugtraq_id(904);

  script_name(english:"Sendmail Crafted ETRN Commands Remote DoS");
  script_summary(english:"Checks the version number");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has an application that is affected by a
denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote Sendmail server, according to its version number,
allows remote attackers to cause a denial of service by
sending a series of ETRN commands then disconnecting from
the server, while Sendmail continues to process the commands
after the connection has been terminated.");
  script_set_attribute(attribute:"solution", value:
"Install Sendmail version 8.10.1 or higher, or install a 
vendor-supplied patch.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-1999-1109");
  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:"1999/12/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2003/03/11");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:sendmail:sendmail");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2003-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SMTP problems");

  script_dependencies("sendmail_detect.nbin");
  script_require_keys("installed_sw/Sendmail");
  exit(0);
}

include("vcf.inc");

app_info = vcf::get_app_info(app:"Sendmail");

constraints = [{ "fixed_version" : "8.10.0" }];

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