CVE-2021-41270

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Summary

CVECVE-2021-41270
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-11-24 19:15:00 UTC
Updated2023-11-07 03:38:00 UTC
DescriptionSymfony/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 `@`.

Risk And Classification

Problem Types: CWE-1236

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 34 All All All
Operating System Fedoraproject Fedora 35 All All All
Application Sensiolabs Symfony All All All All

References

ReferenceSourceLinkTags
Prevent CSV Injection via formulas · Advisory · symfony/symfony · GitHub CONFIRM github.com
[SECURITY] Fedora 34 Update: php-symfony4-4.4.35-1.fc34 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
Release v5.3.12 · symfony/symfony · GitHub MISC github.com
[SECURITY] Fedora 35 Update: php-symfony4-4.4.35-1.fc35 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
Release v5.3.12 by fabpot · Pull Request #44243 · symfony/symfony · GitHub MISC github.com
[SECURITY] Fedora 34 Update: php-symfony4-4.4.35-1.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
Use single quote to escape formulas · symfony/symfony@3da6f2d · GitHub MISC github.com
[SECURITY] Fedora 35 Update: php-symfony4-4.4.35-1.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 179512 Debian Security Update for symfony (CVE-2021-41270)
  • 282093 Fedora Security Update for Hypertext Preprocessor (PHP) (FEDORA-2021-0294e8ca24)
  • 282135 Fedora Security Update for Hypertext Preprocessor (PHP) (FEDORA-2021-10fd47b32d)
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