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---
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layout: news_post
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title: "CVE-2021-41816: Buffer Overrun in CGI.escape_html"
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title: "CVE-2021-41816: CGI.escape_html에서의 버퍼 오버런"
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author: "mame"
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translator:
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translator: "shia"
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date: 2021-11-24 12:00:00 +0000
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tags: security
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lang: en
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lang: ko
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---
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A buffer overrun vulnerability was discovered in CGI.escape_html.
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This vulnerability has been assigned the CVE identifier [CVE-2021-41816](https://nvd.nist.gov/vuln/detail/CVE-2021-41816).
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We strongly recommend upgrading Ruby.
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CGI.escape_html에서 버퍼 오버런 취약점이 발견되었습니다.
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이 취약점은 CVE 번호 [CVE-2021-41816](https://nvd.nist.gov/vuln/detail/CVE-2021-41816)으로 등록되었습니다.
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Ruby를 갱신하는 것을 강력히 권장합니다.
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## Details
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## 세부 내용
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A security vulnerability that causes buffer overflow when you pass a very large string (> 700 MB) to `CGI.escape_html` on a platform where `long` type takes 4 bytes, typically, Windows.
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이 보안 취약점은 `long` 타입으로 4바이트를 받는, Windows 등의 환경에서 `CGI.escape_html`에 700MB 이상의 매우 긴 문자열을 넘길 경우 버퍼 오버플로우를 발생시킵니다.
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Please update the cgi gem to version 0.3.1, 0.2.1, and 0.1.1 or later. You can use `gem update cgi` to update it. If you are using bundler, please add `gem "cgi", ">= 0.3.1"` to your `Gemfile`.
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Alternatively, please update Ruby to 2.7.5 or 3.0.3.
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cgi gem의 버전을 0.3.1, 0.2.1, 0.1.1 또는 그 이상의 버전으로 갱신해 주세요. `gem update cgi` 명령으로 갱신할 수 있습니다. Bundler를 사용하고 있다면, `Gemfile``gem "cgi", ">= 0.3.1"`를 추가해 주세요.
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또는 Ruby를 2.7.5나 3.0.3으로 갱신해 주세요.
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This issue has been introduced since Ruby 2.7, so the cgi version bundled with Ruby 2.6 is not vulnerable.
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이 문제는 Ruby 2.7에서 발생했으므로, Ruby 2.6에 내장되어있는 cgi 버전은 영향을 받지 않습니다.
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## Affected versions
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## 해당 버전
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* cgi gem 0.1.0 or prior (which are bundled versions with Ruby 2.7 series prior to Ruby 2.7.5)
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* cgi gem 0.2.0 or prior (which are bundled versions with Ruby 3.0 series prior to Ruby 3.0.3)
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* cgi gem 0.3.0 or prior
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* cgi gem 0.1.0 이하(Ruby 2.7.5 이하에 내장된 버전)
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* cgi gem 0.2.0 이하(Ruby 3.0.3 이하에 내장된 버전)
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* cgi gem 0.3.0 이하
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## Credits
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## 도움을 준 사람
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Thanks to [chamal](https://hackerone.com/chamal) for discovering this issue.
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이 문제를 발견해 준 [chamal](https://hackerone.com/chamal)에게 감사를 표합니다.
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## History
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## 수정 이력
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* Originally published at 2021-11-24 12:00:00 (UTC)
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* 2021-11-24 12:00:00 (UTC) 최초 공개

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