UltraVNC Viewer < 1.0.5.4 Multiple Integer Overflows

2009-02-06T00:00:00
ID ULTRAVNC_1_0_5_4.NASL
Type nessus
Reporter Tenable
Modified 2018-08-06T00:00:00

Description

The installed version of UltraVNC Viewer is earlier than 1.0.5.4. Such versions reportedly miscalculate a buffer size on the heap. If an attacker can trick a user on the remote host into connecting to a malicious server, he can probably exploit this issue using specially crafted messages to execute code on the affected host subject to the user's privileges.

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



include("compat.inc");

if (description)
{
  script_id(35608);
  script_version("1.9");
 script_cvs_date("Date: 2018/08/06 14:03:16");

  script_cve_id("CVE-2009-0388");
  script_bugtraq_id(33568);

  script_name(english:"UltraVNC Viewer < 1.0.5.4 Multiple Integer Overflows");
  script_summary(english:"Checks version of vncviewer.exe");

 script_set_attribute(attribute:"synopsis", value:
"The remote Windows host has an application that is affected by
multiple integer overflows.");
 script_set_attribute(attribute:"description", value:
"The installed version of UltraVNC Viewer is earlier than 1.0.5.4. Such
versions reportedly miscalculate a buffer size on the heap. If an
attacker can trick a user on the remote host into connecting to a
malicious server, he can probably exploit this issue using specially
crafted messages to execute code on the affected host subject to the
user's privileges.");
 script_set_attribute(attribute:"see_also", value:"http://www.coresecurity.com/content/vnc-integer-overflows");
 script_set_attribute(attribute:"see_also", value:"http://www.securityfocus.com/archive/1/500632/30/0/threaded" );
 script_set_attribute(attribute:"see_also", value:"http://www.uvnc.com/download/1054/" );
 script_set_attribute(attribute:"solution", value:"Upgrade to UltraVNC 1.0.5.4 or later.");
 script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
 script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"true");
 script_set_attribute(attribute:"exploit_framework_core", value:"true");
 script_cwe_id(189);

 script_set_attribute(attribute:"plugin_publication_date", value:"2009/02/06");

script_set_attribute(attribute:"plugin_type", value:"local");
script_end_attributes();


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

  script_copyright(english:"This script is Copyright (C) 2009-2018 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);


# Detect where UltraVNC's installed.
list = get_kb_list("SMB/Registry/HKLM/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/*/DisplayName");
if (isnull(list)) exit(0);
key = NULL;
foreach name (keys(list))
{
  prod = list[name];
  if (prod && prod =~ "^UltraVNC")
  {
    key = ereg_replace(pattern:"^SMB\/Registry\/HKLM\/(.+)\/DisplayName$", replace:"\1", string:name);
    key = str_replace(find:"/", replace:"\", string:key);
    break;
  }
}
if (isnull(key)) 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 the install path.
path = NULL;

key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
if (!isnull(key_h))
{
  item = RegQueryValue(handle:key_h, item:"InstallLocation");
  if (!isnull(item))
  {
    path = item[1];
    path = ereg_replace(pattern:"^(.+)\\$", replace:"\1", string:path);
  }

  RegCloseKey(handle:key_h);
}
RegCloseKey(handle:hklm);
if (isnull(path))
{
  NetUseDel();
  exit(0);
}


# Grab the version and description from the executable.
share = ereg_replace(pattern:"^([A-Za-z]):.*", replace:"\1$", string:path);
exe =  ereg_replace(pattern:"^[A-Za-z]:(.*)", replace:"\1\vncviewer.exe", string:path);
NetUseDel(close:FALSE);

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("1.0.5.4", sep:'.', keep:FALSE);
  for (i=0; i<max_index(fix); i++)
    fix[i] = int(fix[i]);

  for (i=0; i<max_index(ver); i++)
    if ((ver[i] < fix[i]))
    {
      if (report_verbosity)
      {
        version = string(ver[0], ".", ver[1], ".", ver[2], ".", ver[3]);

        report = string(
          "\n",
          "UltraVNC Viewer ", version, " is installed under :\n",
          "\n",
          "  ", path, "\n"
        );
        security_hole(port:port, extra:report);
      }
      else security_hole(port);
      break;
    }
    else if (ver[i] > fix[i])
      break;
}