CVE-2021-41270
Published: 24 November 2021
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 `@`.
Priority
Status
Package | Release | Status |
---|---|---|
symfony Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
focal |
Released
(4.3.8+dfsg-1ubuntu1+esm1)
Available with Ubuntu Pro |
|
hirsute |
Ignored
(end of life)
|
|
impish |
Not vulnerable
(5.2.6+dfsg-1ubuntu7)
|
|
jammy |
Not vulnerable
|
|
kinetic |
Not vulnerable
|
|
lunar |
Not vulnerable
|
|
mantic |
Not vulnerable
|
|
noble |
Not vulnerable
|
|
trusty |
Ignored
(end of standard support)
|
|
upstream |
Released
(4.4.19+dfsg-3)
|
|
xenial |
Not vulnerable
(code not present)
|
|
Patches: upstream: https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8 |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 6.5 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | None |
Availability impact | None |
Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
References
- https://github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x
- https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8 (v4.4.35)
- https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8
- https://github.com/symfony/symfony/releases/tag/v5.3.12
- https://github.com/symfony/symfony/pull/44243
- https://ubuntu.com/security/notices/USN-5290-1
- https://www.cve.org/CVERecord?id=CVE-2021-41270
- NVD
- Launchpad
- Debian