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윤석찬

Offensive Web Security Researcher

Security Contributor of GitHub, Python, Django, Airflow, Ruby, Ruby-on-Rails, Java Spring

Education

2020년 03월 - Present

컴퓨터공학과 재학

경희대학교

2017년 07월 - 2018년 05월

취약점분석트랙 수료

차세대 보안리더 양성 프로그램 Best of the Best 6기

2017년 03월 - 2020년 02월

해킹방어과 졸업

한국디지털미디어고등학교

Work Experience

2025년 07월 - Present 5 개월

Security Team Member (Volunteer)

Airflow Security Team, Apache Software Foundation USA

  • • Airflow 팀에 제보되는 보안 이슈 검토 및 대응
  • • 오픈소스 커뮤니티와의 협업
  • • ASF 가이드라인에 따라 프로젝트의 보안 수준 유지
2025년 04월 - Present 8 개월

Security Researcher

Zellic.io USA

  • • Web3 블록체인 기반 서비스 Web2 컴포넌트 보안 감사
2023년 09월 - 2025년 03월 1 년 6 개월

OO부대, OO병

국방부 산하 연구소

  • • OO 연구 개발
2020년 07월 - 2023년 06월 3 년

R&D / 선제대응팀, Security Engineer

스틸리언

  • • 웹 모의해킹
  • • 교육시스템 (Cyber Drill System, Django + React) 개발 및 CTF 운영
  • • 사내 기술 관리 도구, 기술블로그, 배포시스템 등 인프라 개발 및 유지보수

CTF Awards

2025 사이버공격방어대회

Finalist
일반부문

- 국가정보원 주최

- Team: 경희대미남해커들 (KHU's hansome hackers)

2025 DEF CON CTF 33

Finalist

- Nautilus Institute 주최

- Team: Cold Fusion

🏆 2024 화이트햇 콘테스트

용사부문

- 국방부 주최

- Team: 키보드워리어플랫폼

1st, 국방부장관상

2023 CODEGATE

Finalist
대학부

- 과학기술정보통신부 주최

- Team: 경희대미남해커들 (KHU's hansome hackers)

2022 CODEGATE

Finalist
대학부

- 과학기술정보통신부 주최

- Team: 경희대미남해커들 (KHU's hansome hackers)

🏆 2022 사이버공격방어대회

공공부문

- 국가정보원 주최

- Team: resilience

2nd, 국가보안연구소장상

🏆 2022 HACKTHEON SEJONG 전국대학생사이버보안경진대회

- 세종특별자치시 주최

- Team: 라임도둑

6st, 국가보안연구소장상

🏆 2021 사이버공격방어대회

공공부문

- 국가정보원 주최

- Team: resilience

2nd, 국가보안연구소장상

🏆 2019 사이버작전경연대회

학생부

- 국방부 주최

- Team: 윤석찬TV구독과좋아요알림설정까지

2nd, 사이버작전사령관상

🏆 2018 정보보안경진대회

개인예선

- 교육부 주최

1st, 서울여대 총장상

🏆 2018 정보보안경진대회

단체본선

- 교육부 주최

- Team: 문시우1인팀

1st, 교육부 장관상

🏆 2017 정보보안경진대회

단체본선

- 한국교육학술정보원 주최

- Team: 4-day exploit

1st, 한국교육학술정보원장상

Disclosed Vulnerabilities

Python Python

CVE-2024-7592

Denial of Service
Internals

A vulnerability in Python allows quadratic complexity parsing when handling cookies containing backslashes, potentially leading to performance degradation.

Django Django

CVE-2023-36053

Regular Expression Denial of Service
Internals

In Django 3.2 before 3.2.20, 4 before 4.1.10, and 4.2 before 4.2.3, `EmailValidator` and `URLValidator` are subject to a potential ReDoS (regular expression denial of service) attack via a very large number of domain name labels of emails and URLs.

Django Django

CVE-2024-24680

Denial of Service
Templates

A vulnerability in the Django `intcomma` template filter could lead to a potential denial of service if certain crafted inputs are processed.

Django Django

CVE-2024-27351

Regular Expression Denial of Service
Utilities

A vulnerability in Django's `Truncator.words()` function may allow a ReDoS attack under certain circumstances.

Django Django

CVE-2024-21520

Cross-Site Scripting
Rest Framework

The browserable API of the Django Rest Framework is vulnerable to cross-site scripting due to improper sanitization of user-supplied inputs.

Django Django

CVE-2024-41991

Denial of Service
Utilities

A vulnerability in Django's `urlize` function and `AdminURLFieldWidget` could allow for a denial of service under specific crafted input conditions.

Django Django

CVE-2024-53908

SQL Injection
Database

A vulnerability in the `HasKey` function in Django when using Oracle databases may allow a potential SQL injection.

Django Django

CVE-2025-48432

Log Injection
Internal Logging

Internal HTTP response logging used request.path directly, allowing control characters (e.g. newlines or ANSI escape sequences) to be written unescaped into logs.

Django Django

CVE-2025-64458

Denial of Service
HTTP Responses

Python's NFKC normalization is slow on Windows. As a consequence, Django's HttpResponseRedirect, HttpResponsePermanentRedirect, and the redirect() shortcut were subject to a potential denial-of-service attack via inputs containing a very large number of Unicode characters (follow-up to CVE-2025-27556).

FastAPI FastAPI / Starlette

CVE-2025-62727

Denial of Service
starlette.responses.FileResponse

Found an O(n^2) complexity denial of service in Starlette's FileResponse Range header merging that lets an attacker exhaust resources with a single crafted request.

Apache Apache Airflow

CVE-2024-39877

Code Execution
Scheduler

A vulnerability in Apache Airflow's scheduler allows DAG authors to execute arbitrary code, potentially compromising the scheduler node.

Apache Apache Airflow

CVE-2024-39863

Cross-Site Scripting
Web Interface

Improper sanitization in Apache Airflow's web interface could lead to a cross-site scripting vulnerability.

Apache Apache Airflow

CVE-2024-45034

Code Execution
Scheduler

Authenticated DAG authors in Apache Airflow can execute arbitrary code on scheduler nodes, leading to potential system compromise.

Ruby Ruby

CVE-2024-41123

Denial of Service
REXML

Vulnerabilities in Ruby's REXML library allow attackers to cause a denial of service by crafting malicious XML inputs.

Ruby Ruby on Rails

CVE-2024-47887

Regular Expression Denial of Service
Action Controller

Ruby on Rails' Action Controller is vulnerable to a potential regular expression denial of service when handling HTTP token authentication.

Ruby Ruby on Rails

CVE-2024-41128

Regular Expression Denial of Service
Action Dispatch

A vulnerability in Rails' Action Dispatch may allow a regular expression denial of service when filtering query parameters.

Java Java Spring

CVE-2024-38809

Denial of Service
Framework

Spring Framework is vulnerable to a potential denial of service caused by a crafted conditional HTTP request.

GitHub GitHub

HackerOne #2646500

Denial of Service
GitHub & GitHub Enterprise

GitHub is vulnerable to a potential denial of service caused by a malicously crafted HTTP request.

NAVER NAVER

NBB-1126

Stored XSS
NAVER service

NAVER is vulnerable to a stored-xss caused by a crafted payload.

NAVER NAVER

NBB-1143

SQL Injection
NAVER service

NAVER is vulnerable to a SQL injection caused by a crafted payload.

NAVER NAVER

NBB-1260

Stored XSS
NAVER service

NAVER is vulnerable to a stored XSS caused by a crafted payload.

Talks

2024

" 해커의 관점에서 바라본 Django Framework " (한국어)

PyCon KR 2024

2023

" Django Framework N-day 취약점 분석과 시큐어 코딩 가이드 " (한국어)

CODEGATE 2023

2023

" Django 프레임워크 1-day analysis " (한국어)

제 26회 해킹캠프

2022

" 모던 웹 서비스에서의 버그케이스와 시큐어코딩 " (한국어)

STEALIEN Security Semiar

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