SAP Sybase Adaptive Server Enterprise DoS (SAP Note 1887342)

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(70974);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/03");

  script_cve_id("CVE-2013-6862");
  script_bugtraq_id(63549);
  script_xref(name:"IAVA", value:"2013-A-0217-S");

  script_name(english:"SAP Sybase Adaptive Server Enterprise DoS (SAP Note 1887342)");
  script_summary(english:"Checks sqlserver.exe version");

  script_set_attribute(attribute:"synopsis", value:
"The version of SAP Sybase Adaptive Server Enterprise (ASE) installed on
the remote host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"An unauthenticated, remote attacker can trigger a condition in which
SAP Sybase ASE enters an endless loop, causing it to consume all of the
available processing time.  This causes the entire machine to become
unresponsive until the process is terminated manually.  An attacker can
use this flaw to launch a denial of service (DoS) attack.");
  script_set_attribute(attribute:"see_also", value:"https://service.sap.com/sap/support/notes/1887342");
  script_set_attribute(attribute:"see_also", value:"http://www.sybase.com/detail?id=1099371");
  script_set_attribute(attribute:"solution", value:
"Apply one of the patches listed in the advisory.");
  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_attribute(attribute:"cvss_score_source", value:"CVE-2013-6862");

  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:"2013/09/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/01/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/11/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:sybase:adaptive_server_enterprise");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2013-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("sybase_ase_installed.nbin");
  script_require_keys("SMB/Sybase_ASE/Installed");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");


kb = "SMB/Sybase_ASE/";
get_kb_item_or_exit(kb + "Installed");

path = get_kb_item_or_exit(kb + "Path");
ver  = get_kb_item_or_exit(kb + "Version");
ebf  = get_kb_item_or_exit(kb + "EBF");
arch = get_kb_item_or_exit(kb + "Architecture");
servername = get_kb_item(kb + "ServerName");
######################################################################
# This issue has been fixed in the following SAP Sybase ASE versions:
#
# Platform: Windows x64
#     EBF 21150: 15.7   SP100
#     EBF 20807: 15.7   ESD #4
#     EBF 21262: 15.5   ESD #5.3
#     EBF 21293: 15.0.3 ESD #4.3
#
# Platform: Windows x86
#     EBF 21149: 15.7   SP100
#     EBF 20806: 15.7   ESD #4
#     EBF 21261: 15.5   ESD #5.3
#     EBF 21286: 15.0.3 ESD #4.3
######################################################################

if (ver =~ "^15\.7([^0-9]|$)")
{
  # Choose the lowest EBF on this branch.
  ver_fix = "15.7 ESD #4";
  if (arch == "x64")
    ebf_fix = 20807;
  else
    ebf_fix = 20806;
}
else if (ver =~ "^15\.5([^0-9]|$)")
{
  # Choose the lowest EBF on this branch.
  ver_fix = "15.5 ESD #5.3";
  if (arch == "x64")
    ebf_fix = 21262;
  else
    ebf_fix = 21261;
}
else
{
  # Choose the lowest EBF on this branch.
  ver_fix = "15.0.3 ESD #4.3";
  if (arch == "x64")
    ebf_fix = 21293;
  else
    ebf_fix = 21286;
}

if (isnull(ebf_fix) || ebf >= ebf_fix)
  audit(AUDIT_INST_PATH_NOT_VULN, "SAP Sybase ASE", ver, path);

report = NULL;
if (report_verbosity > 0)
{
  report =
    '\n  Path              : ' + path +
    '\n  Installed version : ' + ver +
    '\n  Fixed version     : ' + ver_fix +
    '\n';
  if(servername)
  {
    servers = split(servername, keep:FALSE);
    foreach server (servers)
    {
      server_report += server + '\n' + crap(data:' ', length:22);
    }
    report += '  Server Name       : ' + server_report + '\n';
  }
}

port = get_kb_item("SMB/transport");
if (!port) port = 445;

security_hole(port:port, extra:report);