Symantec Mail Security for SMTP File Parsing Vulnerabilities

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

include("compat.inc");

if (description)
{
  script_id(27586);
  script_version("1.9");
  script_cvs_date("Date: 2018/11/15 20:50:28");

  script_name(english:"Symantec Mail Security for SMTP File Parsing Vulnerabilities");
  script_summary(english:"Checks version of SMS for SMTP");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host contains an application that is affected by
multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"Symantec Mail Security for SMTP, which provides anti-spam and anti-
virus protection for the IIS SMTP Service, is installed on the remote
Windows host.

The version of Symantec Mail Security for SMTP installed on the remote
host reportedly is affected by multiple vulnerabilities caused by
buffer overflows in third-party file viewers. Using a specially-
crafted email message with an executable attachment, a remote attacker
may be able to leverage this issue to crash the service or execute
arbitrary code.

Note that successful exploitation of this issue would allow an
attacker to gain complete control of the affected host as Symantec
Mail Security for SMTP runs with LOCAL SYSTEM privileges by default.");
  script_set_attribute(attribute:"see_also", value:"https://secuniaresearch.flexerasoftware.com/advisories/27367/");
  script_set_attribute(attribute:"solution", value:
"Upgrade as necessary to Symantec Mail Security for SMTP 5.0.1 and
apply patch 182 or later as Secunia claims the issues were silently
patched.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");

  script_set_attribute(attribute:"plugin_publication_date", value:"2007/10/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:symantec:mail_security");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2007-2018 Tenable Network Security, Inc.");

  script_dependencies("smb_enum_services.nasl", "smb_hotfixes.nasl");
  script_require_keys("SMB/Registry/Enumerated");
  script_require_ports(139, 445);

  exit(0);
}


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


if (!get_kb_item("SMB/Registry/Enumerated")) exit(0);


# Make sure the SMS for SMTP service is running, unless we're
# being paranoid.
if (report_paranoia < 2)
{
  services = get_kb_item("SMB/svcs");
  if (
    !services ||
    ("SMSTomcat" >!< services && "Symantec Mail Security for SMTP" >!< services)
  ) exit(0);
}



# Connect to the appropriate share.
name    =  kb_smb_name();
port    =  kb_smb_transport();
login   =  kb_smb_login();
pass    =  kb_smb_password();
domain  =  kb_smb_domain();



if(! smb_session_init()) audit(AUDIT_FN_FAIL, 'smb_session_init');
rc = NetUseAdd(login:login, password:pass, domain:domain, share:"IPC$");
if (rc != 1) {
  NetUseDel();
  exit(0);
}


# Connect to remote registry.
hklm = RegConnectRegistry(hkey:HKEY_LOCAL_MACHINE);
if (isnull(hklm))
{
  NetUseDel();
  exit(0);
}


# Find where it's installed.
path = NULL;

key = "SOFTWARE\Symantec\SMSSMTP";
key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
if (!isnull(key_h))
{
  value = RegQueryValue(handle:key_h, item:"LoadPoint");
  if (!isnull(value))
  {
    path = value[1];
    path = ereg_replace(pattern:"^(.+)\\$", replace:"\1", string:path);
  }
  RegCloseKey(handle:key_h);
}
RegCloseKey(handle:hklm);
if (isnull(path))
{
  NetUseDel();
  exit(0);
}
NetUseDel(close:FALSE);


# Grab the file version of bmagent.exe.
share = ereg_replace(pattern:"^([A-Za-z]):.*", replace:"\1$", string:path);
exe =  ereg_replace(pattern:"^[A-Za-z]:(.*)", replace:"\1\scanner\bin\bmagent.exe", string:path);

rc = NetUseAdd(login:login, password:pass, domain:domain, share:share);
if (rc != 1)
{
  NetUseDel();
  exit(0);
}

fh = CreateFile(
  file:exe,
  desired_access:GENERIC_READ,
  file_attributes:FILE_ATTRIBUTE_NORMAL,
  share_mode:FILE_SHARE_READ,
  create_disposition:OPEN_EXISTING
);
ver = NULL;
if (!isnull(fh))
{
  ver = GetFileVersion(handle:fh);
  CloseFile(handle:fh);
}
NetUseDel();


# Check the version number.
if (!isnull(ver))
{
  fix = split("5.0.1.182", sep:'.', keep:FALSE);
  for (i=0; i<4; i++)
    fix[i] = int(fix[i]);

  for (i=0; i<max_index(ver); i++)
    if ((ver[i] < fix[i]))
    {
      security_hole(port);
      break;
    }
    else if (ver[i] > fix[i])
      break;
}