CVE-2021-41270

Published on: 11/24/2021 12:00:00 AM UTC

Last Modified on: 12/03/2021 03:15:00 AM UTC

CVE-2021-41270 - advisory for GHSA-2xhg-w2g5-w95x

Source: Mitre Source: Nist Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Certain versions of Symfony from Sensiolabs contain the following vulnerability:

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 `@`.

  • CVE-2021-41270 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as MEDIUM severity.
  • Affected Vendor/Software: URL Logo symfony - symfony version >= 4.1.0, < 4.4.35
  • Affected Vendor/Software: URL Logo symfony - symfony version >= 5.0.0, < 5.3.12

CVSS3 Score: 6.5 - MEDIUM

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW LOW NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED HIGH NONE NONE

CVSS2 Score: 4 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK LOW SINGLE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL NONE NONE

CVE References

Description Tags Link
Prevent CSV Injection via formulas · Advisory · symfony/symfony · GitHub github.com
text/html
URL Logo CONFIRM github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x
[SECURITY] Fedora 34 Update: php-symfony4-4.4.35-1.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-0294e8ca24
Release v5.3.12 · symfony/symfony · GitHub github.com
text/html
URL Logo MISC github.com/symfony/symfony/releases/tag/v5.3.12
[SECURITY] Fedora 35 Update: php-symfony4-4.4.35-1.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-10fd47b32d
Release v5.3.12 by fabpot · Pull Request #44243 · symfony/symfony · GitHub github.com
text/html
URL Logo MISC github.com/symfony/symfony/pull/44243
Use single quote to escape formulas · symfony/[email protected] · GitHub github.com
text/html
URL Logo MISC github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8

Related QID Numbers

  • 282093 Fedora Security Update for Hypertext Preprocessor (PHP) (FEDORA-2021-0294e8ca24)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationSensiolabsSymfonyAllAllAllAll
  • cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @symfony CVE-2021-41270: Prevent CSV Injection via formulas symfony.com/blog/cve-2021-… #symfony 2021-11-24 09:13:12
Twitter Icon @websagiles CVE-2021-41270: Prevent CSV Injection via formulas dlvr.it/SD5tBk https://t.co/gEyzx0rRRN 2021-11-24 11:13:41
Twitter Icon @CVEreport CVE-2021-41270 : Symfony/Serializer handles serializing and deserializing data structures for Symfony, a PHP framew… twitter.com/i/web/status/1… 2021-11-24 19:11:53
Reddit Logo Icon /r/symfony CVE-2021-41270: Prevent CSV Injection via formulas 2021-11-24 10:00:10
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