MS15-096: Vulnerability in Active Directory Service Could Allow Denial of Service (3072595)

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

include("compat.inc");

if (description)
{
  script_id(85846);
  script_version("1.7");
  script_cvs_date("Date: 2018/11/15 20:50:31");

  script_cve_id("CVE-2015-2535");
  script_bugtraq_id(76554);
  script_xref(name:"MSFT", value:"MS15-096");
  script_xref(name:"MSKB", value:"3072595");
  script_xref(name:"IAVB", value:"2015-B-0110");

  script_name(english:"MS15-096: Vulnerability in Active Directory Service Could Allow Denial of Service (3072595)");
  script_summary(english:"Checks the version of samsrv.dll.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by a denial of service
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote Windows host is affected by a denial of service
vulnerability in Active Directory that is triggered during the
handling of a saturation of account creations. An authenticated,
remote attacker, with privileges to join machines to a domain, can
exploit this vulnerability by creating multiple machine accounts,
resulting in the Active Directory service becoming non-responsive.");
  script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2015/ms15-096");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Windows 2008, 2008 R2,
2012, and 2012 R2.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  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:"2015/09/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/09/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2015-2018 Tenable Network Security, Inc.");

  script_dependencies("smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include("audit.inc");
include("smb_hotfixes_fcheck.inc");
include("smb_hotfixes.inc");
include("smb_func.inc");
include("misc_func.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = 'MS15-096';
kbs = make_list('3072595');

if (get_kb_item("Host/patch_management_checks")) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_WARNING);

get_kb_item_or_exit("SMB/Registry/Enumerated");
get_kb_item_or_exit("SMB/WindowsVersion", exit_code:1);

if (hotfix_check_sp_range(vista:'2', win7:'1', win8:'0', win81:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

# Vista, 7, 8, 8.1 are not affected
productname = get_kb_item_or_exit("SMB/ProductName", exit_code:1);
if (
  "Windows 7" >< productname ||
  "Windows 8" >< productname ||
  "Windows Embedded" >< productname ||
  "Windows Vista" >< productname
) exit(0, "The host is running "+productname+" and hence is not affected.");

share = hotfix_get_systemdrive(as_share:TRUE, exit_on_fail:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

if (
  # Windows Server 2012 R2
  hotfix_is_vulnerable(os:"6.3", sp:0, file:"samsrv.dll", version:"6.3.9600.18009", min_version:"6.3.9600.16000", dir:"\system32", bulletin:bulletin, kb:"3072595") ||

  # Windows Server 2012
  hotfix_is_vulnerable(os:"6.2", sp:0, file:"samsrv.dll", version:"6.2.9200.21585", min_version:"6.2.9200.20000", dir:"\system32", bulletin:bulletin, kb:"3072595") ||
  hotfix_is_vulnerable(os:"6.2", sp:0, file:"samsrv.dll", version:"6.2.9200.17469", min_version:"6.2.9200.16000", dir:"\system32", bulletin:bulletin, kb:"3072595") ||

  # Server 2008 R2
  hotfix_is_vulnerable(os:"6.1", sp:1, file:"samsrv.dll", version:"6.1.7601.23159", min_version:"6.1.7601.22000", dir:"\system32", bulletin:bulletin, kb:"3072595") ||
  hotfix_is_vulnerable(os:"6.1", sp:1, file:"samsrv.dll", version:"6.1.7601.18956", min_version:"6.1.7600.16000", dir:"\system32", bulletin:bulletin, kb:"3072595") ||

  # Windows Server 2008
  hotfix_is_vulnerable(os:"6.0", sp:2, file:"samsrv.dll", version:"6.0.6002.23777", min_version:"6.0.6002.23000", dir:"\system32", bulletin:bulletin, kb:"3072595") ||
  hotfix_is_vulnerable(os:"6.0", sp:2, file:"samsrv.dll", version:"6.0.6002.19467", min_version:"6.0.6001.18000", dir:"\system32", bulletin:bulletin, kb:"3072595")
)
{
  set_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
  hotfix_security_warning();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}