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osvGoogleOSV:CVE-2021-41270
HistoryNov 24, 2021 - 7:15 p.m.

CVE-2021-41270

2021-11-2419:15:07
Google
osv.dev
10
symfony
serializer
csv injection
owasp
php
web application
console application
data structures

AI Score

6.7

Confidence

High

EPSS

0.001

Percentile

47.3%

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 @.

AI Score

6.7

Confidence

High

EPSS

0.001

Percentile

47.3%