(You can read this article in English here.)

免責事項

GitHubはBug Bountyプログラムを実施しており、その一環として脆弱性の診断行為をセーフハーバーにより許可しています。
本記事は、そのセーフハーバーの基準を遵守した上で調査を行い、その結果発見した脆弱性に関して解説したものであり、無許可の脆弱性診断行為を推奨することを意図したものではありません。
GitHub上で脆弱性を発見した場合は、GitHub Bug Bountyへ報告してください。

(この記事は日本語でも読むことが出来ます。)

Disclaimer

GitHub is running a bug bounty program on HackerOne, and as part of this program, vulnerability research is permitted by the safe harbor.
This article describes a vulnerability that I discovered as a result of my investigation in compliance with the safe harbor criteria and is not intended to encourage unauthorized vulnerability research activities.
If you find a vulnerability on GitHub, please report it to GitHub Bug Bounty.

TL;DR

In the actions/runner repository, which hosts the source code for the GitHub Actions runner, there was a flaw in the usage of the self-hosted runner, which allowed me to steal the Personal Access Token from GitHub Actions.
Since this token was tied to the GitHub staff account, I could perform various actions as a GitHub staff.
This potentially allowed the insertion of malicious code into repositories such as actions/checkout and actions/cache, which might affect many repositories that use GitHub Actions.

(この記事は日本語でも読むことが出来ます。)

Disclaimer

Deno Land Inc., which develops Deno, isn’t running bug bounty programs, so they don’t explicitly allow vulnerability assessments.

This article describes the vulnerabilities that were reported as potential vulnerabilities, using publicly available information. This was done without actually exploiting/demonstrating the vulnerabilities and it’s not intended to encourage you to perform an unauthorized vulnerability assessment.
If you find any vulnerabilities in Deno-related services/products, please report them to [email protected].¹

Also, the information contained in this article may be inaccurate because the information of a vulnerability couldn’t be validated.²

TL;DR

I found a vulnerability that could be used to read arbitrary files from the system running deno.land/x, and a Code Injection in encoding/yaml of Deno.
Of these, if the vulnerability in deno.land/x was exploited, the AWS credentials used to store the module in S3 could be stolen, resulting in arbitrary package tampering in deno.land/x.

(You can read this article in English too.)

免責事項

Denoを開発しているDeno Land Inc.は、脆弱性報奨金制度等を実施しておらず、脆弱性の診断行為に関する明示的な許可を出していません。

本記事は、公開されている情報を元に脆弱性の存在を推測し、実際に攻撃/検証することなく潜在的な脆弱性として報告した問題に関して説明したものであり、無許可の脆弱性診断行為を推奨することを意図したものではありません。
Deno Land Inc.が開発するサービスや製品に脆弱性を見つけた場合は、[email protected]へ報告してください。¹

はじめに

@typesスコープを管理しているDefinitely Typedは、Microsoftから支援を受けているものの、Microsoftの脆弱性報奨金制度におけるセーフハーバーの対象ではありません。¹
本記事は、公開されている情報を元に脆弱性の存在を推測し、実際に検証することなく潜在的な脆弱性として報告した問題に関して説明したものであり、無許可の脆弱性診断行為を推奨することを意図したものではありません。
Definitely Typedに脆弱性を発見した場合は、Definitely Typedのメンバーへ報告してください。

Preface

Definitely Typed, a project which manages npm packages inside the @types scope, is supported by Microsoft. However, it is not in the scope of the safe harbor for Microsoft’s bug bounty program.¹

This article describes the vulnerabilities that were reported as potential vulnerabilities, using publicly available information. This was done without actually exploiting / demonstrating the vulnerabilities.

This article is not intended to encourage you to perform an unauthorized vulnerability assessment.
If you find any vulnerabilities in Definitely Typed related products, please report them to members of Definitely Typed.

TL;DR

There were vulnerabilities in the pull request management bot of Definitely Typed, which allowed an attacker to merge a malicious pull request into DefinitelyTyped/DefinitelyTyped.
This would result in tampering with arbitrary packages under the @types scope of npm.

Preface

(日本語版も公開されています。)

While PyPI has a security page, they don’t have a clear policy for vulnerability assessments.¹
This article describes the vulnerabilities that were reported as potential vulnerabilities, using publicly available information. This was done without actually exploiting / demonstrating the vulnerabilities.

This article is not intended to encourage you to perform an unauthorized vulnerability assessment.
If you find any vulnerabilities in PyPI, please report them to [email protected].²

TL;DR

There was a vulnerability in GitHub Actions of PyPI’s repository, which allowed a malicious pull request to execute an arbitrary command.
This allows an attacker to obtain write permission against the repository, which could lead to arbitrary code execution on pypi.org.

はじめに

(English version is also available.)

PyPIは、セキュリティページ自体は公開しているものの、脆弱性診断行為に対する明確なポリシーを設けていません。¹
本記事は、公開されている情報を元に脆弱性の存在を推測し、実際に検証することなく潜在的な脆弱性として報告した問題に関して説明したものであり、無許可の脆弱性診断行為を推奨することを意図したものではありません。

はじめに

(English version is also available.)

cdnjsの運営元であるCloudflareは、HackerOne上で脆弱性開示制度(Vulnerability Disclosure Program)を設けており、脆弱性の診断行為を許可しています。
本記事は、当該制度を通して報告された脆弱性をCloudflareセキュリティチームの許可を得た上で公開しているものであり、無許可の脆弱性診断行為を推奨することを意図したものではありません。
Cloudflareが提供する製品に脆弱性を発見した場合は、Cloudflareの脆弱性開示制度へ報告してください。

Preface

(日本語版も公開されています。)

Cloudflare, which runs cdnjs, is running a “Vulnerability Disclosure Program” on HackerOne, which allows hackers to perform vulnerability assessments.
This article describes vulnerabilities reported through this program and published with the permission of the Cloudflare security team.
So this article is not intended to recommend you to perform an unauthorized vulnerability assessment.
If you found any vulnerabilities in Cloudflare’s product, please report it to Cloudflare’s vulnerability disclosure program.

TL;DR

There was a vulnerability in the cdnjs library update server that could execute arbitrary commands, and as a result, cdnjs could be completely compromised.
This allows an attacker to tamper 12.7%¹ of all websites on the internet once caches are expired.