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HackfestCTF 2024 Web writeup
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🚩 CTF
[ University ] We need to access to environment variable. @app.route('/', methods=['GET', 'POST']) def login(): if request.method == 'POST': username = request.form['username'] password = request.form['password'] try: response = requests.get(f"http://localhost:5000/api/users/{username}/auth") response.raise_for_status() conn = connect_db() cursor = conn.cursor() cursor.execute('SELECT * FROM use..
Phar Deserialization
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WEB
Serialization & DeserializationSerialization : 데이터 구조체나 Object 상태의 데이터를 다른 시스템 환경에서도 해석될 수 있도록 Byte Stream 상태로 변환하는 과정Deserialization : Byte Stream 상태의 데이터를 데이터 구조체나 Object로 변환하는 과정Phar (PHP Archive)Phar는 내부에 실행 가능한 PHP 코드를 모아놓은 아카이브 포맷을 뜻한다. Phar 파일은 아래 4가지의 구조로 이루어진다.StubManifestFile ContentsSiganutre (Optional)[ Stub ]Stub은 작은 형태의 코드를 담을 수 있는 공간이다. Stub의 마지막 명령어에는 반드시 _HALTCOMPILER()가 포함되어야 한..
CVE-2023-27224 (NginxProxyManager)
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💻 Security
[ Info ]Target : Nginx Proxy ManagerVersion : 2.9.19Category : Arbitrary Code Execution[ Build ]docker run -p 8080:80 -p 8081:81 jc21/nginx-proxy-manager:2.9.19[ Product Overview ]Nginx Proxy Manager which is based on NodeJS, is a open-source tool to simplify the management of Nginx's proxy, SSL, Access lists, and more. It lets user manage, control their site easier. For example, it provide the ..
Cronus
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CVE-2024-4367 (PDF.js - Arbitrary JS Execution)
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💻 Security
Vulnerable Product & VersionAll FireFox Users ( Services which use pdfjs-dist(SummaryPDF.js acts as a viewer to show a preview of a pdf file, which is made by Mozila.It has the ability to render fonts and CVE-2024-4367 vulnerabilitiy targets this part.The user can set the values of the PDF file's properties, and pdf.js applies them by executing JavaScript code.However, there is no validation of ..