CVE-2021-41270

Improper Neutralization of Formula Elements in a CSV File in packagist/symfony/symfony

Identifiers

CVE-2021-41270, GHSA-2xhg-w2g5-w95x

Package Slug

packagist/symfony/symfony

Vulnerability

Improper Neutralization of Formula Elements in a CSV File

Description

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 is vulnerable to CSV injection, also known as formula injection. In Symfony, 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.

Affected Versions

All versions starting from 4.1.0 before 4.4.35, all versions starting from 5.0.0 before 5.3.12

Solution

Upgrade to versions 4.4.35, 5.3.12 or above.

Last Modified

2021-12-02

source