CVE-2021-41270— Sensio Labs Symfony 安全漏洞

CSV Injection in Symfony

Symfony/Serializer handles serializing and deserializing data structures for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Symfony versions 4.1.0 before 4.4.35 and versions 5.0.0 before 5.3.12 are vulnerable to CSV injection, also known as formula injection. In Symfony 4.1, maintainers added the opt-in `csv_escape_formulas` option in the `CsvEncoder`, to prefix all cells starting with `=`, `+`, `-` or `@` with a tab `\t`. Since then, OWASP added 2 chars in that list: Tab (0x09) and Carriage return (0x0D). This makes the previous prefix char (Tab `\t`) part of the vulnerable characters, and OWASP suggests using the single quote `'` for prefixing the value. Starting with versions 4.4.34 and 5.3.12, Symfony now follows the OWASP recommendations and uses the single quote `'` to prefix formulas and add the prefix to cells starting by `\t`, `\r` as well as `=`, `+`, `-` and `@`.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CWE-1236

Sensio Labs Symfony 安全漏洞

Sensio Labs Symfony是法国Sensio Labs公司的一套免费的、基于MVC架构的PHP开发框架。该框架提供常用的功能组件及工具，可用于快速创建复杂的WEB程序。 Symfony 存在安全漏洞，该漏洞源于软件容易受到CSV注入的影响，也被称为公式注入。在Symfony 4.1中，维护人员在“CsvEncoder”中添加了opt-In“csvu escapeu formulas”选项，以在所有以“=”、“+”、“-”或“@”开头的单元格前面加上制表符“ ”。此后，OWASP在该列表中添加了

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