OtterCTF Writeup Network Birdman's Data 150

Network

Birdman's Data 150

We recorded some of BirdMan's networking, but a part of it (the important part) got scrambled.

 Birdmans_data.pcapが渡される。

パケットを確認するとHTTPでなにか通信してた。

f:id:Yunolay:20181210230930p:plain

f:id:Yunolay:20181210231004p:plain

www.txtwizard.net/cryptoで

AES/CBC/PKCS5で暗号化している。

GET /crypto HTTP/1.1
Host: www.txtwizard.net

HTTP/1.1 200 OK

GET /crypto/AES/key/128/?_=1531740269666 HTTP/1.1
Host: www.txtwizard.net

HTTP/1.1 200 OK
{"key":"XfCtxvD1yFZbxQ/+ULhAcA=="}

GET /crypto/AES/key/128/?_=1531740269667 HTTP/1.1
Host: www.txtwizard.net

HTTP/1.1 200 OK
{"key":"sEhrZxQpnNnINixu3KQ1Tg=="}

POST /crypto/AES/encrypt/CBC/PKCS5 HTTP/1.1
Host: www.txtwizard.net

HTTP/1.1 200 OK
{"cipherText":"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"}

cipherTextとkeyを使って復号化する。

f:id:Yunolay:20181210231558p:plain

Chance Something's wrong, I can feel it (Six minutes, Slim Shady, you're on) Just a feeling I've got, like something's about
To happen, but I don't know what If that means, what I think it means, we're in trouble, big trouble, And if he is as bananas as you say, I'm not taking any chances You were just what the doctor ordered I'm beginning to
Feel like a Rap God, Rap God All my people from the front to the back nod, back nod Now who thinks their arms are long
{
Enough to slap box, slap box? They said I rap like a robot, so call
me Rapbot But for me to rap like a computer must be
in my genes I got a laptop in my back pocket My pen'll go off when I half-c*** it Got a fat knot from that rap profit Made a living and a killing off it Ever since Bill Clinton was still in office With Monica Lewinsky feeling on his
Nut-sack I'm an MC still as honest But as rude and indecent as all hell syllables, killaholic (Kill 'em all with) This slickety, gibbedy, hibbedy hip hop You don't really wanna get into a pissing match with this rappidy rap Packing a Mac in the back of the Ac, pack backpack rap, yep, yackidy-yac The
exact same time I attempt these lyrical acrobat stunts while I'm practicing That I'll still be able to break a
Motherf***in' table Over the back of a couple of
_
Faggots and crack it in half
Only
Realized it was ironic I was signed to Aftermath after the fact How could I not blow? All I do is drop F-bombs, feel my wrath of attack Rappers are having a rough time period, here's a Maxipad It's actually disastrously bad For the wack while I'm masterfully constructing this masterpiece as I'm beginning to feel
_
Like a Rap God, Rap God All my people from the front to the back nod, back nod Now who thinks their arms are long enough to slap box, slap box? Let me show you maintaining this s*** ain't that hard, that hard Everybody want the key and the secret to rap
immortality like I have got Well, to be truthful the blueprint's simply rage and youthful exuberance Everybody loves to root
for a nuisance Hit the
Earth like an asteroid, did nothing but shoot for the moon since MC's
_
get taken to school with this music Cause I use it as a vehicle to bust a rhyme Now I lead a new school full of students Me? I'm a product of Rakim, Lakim Shabazz, 2Pac N- -W.A, Cube, hey, Doc, Ren, Yella,
Eazy, thank you, they got Slim Inspired
enough to one day grow up, blow up and be in a position To meet Run DMC and induct them into the motherf***in' Rock n' Roll Hall of Fame Even though I walk in the church and burst in a ball of flames Only Hall of Fame I be inducted in is the alcohol of fame On the wall of shame You fags think it's all a game 'til I walk a flock of flames Off of planking, tell me what in the f*** are you thinking? Little gay looking boy So gay I can barely say it with a straight face looking boy You witnessing a massacre Like you watching a church gathering take place looking boy Oy vey, that boy's gay, that's all they say looking boy You get a thumbs up, pat on the back And a way to go from your label everyday looking boy Hey, looking boy, what you say looking boy? I got a "hell yeah" from Dre looking boy I'mma work for everything I have Never ask nobody for s***, get outta my face looking boy Basically boy you're never gonna be capable To keep up with the same pace looking boy 'Cause I'm beginning to feel like a Rap God, Rap God All my people from the front to the back nod, back nod The way I'm racing around the track, call me Nascar, Nascar Dale Earnhardt of the trailer park, the White Trash God Kneel before General
zorb

 }が最後に改行でついていて縦読みに気づいた。

一行目を縦読みすることでフラグが得られた。

FLAG:CTF{EmiNeM_FOR_LifE_gEez}