CVE-2021-41267

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

Last Modified on: 11/30/2021 06:52:00 PM UTC

CVE-2021-41267 - advisory for GHSA-q3j3-w37x-hq2q

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

Certain versions of Symfony from Sensiolabs contain the following vulnerability:

Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Headers that are not part of the "trusted_headers" allowed list are ignored and protect users from "Cache poisoning" attacks. In Symfony 5.2, maintainers added support for the `X-Forwarded-Prefix` headers, but this header was accessible in SubRequest, even if it was not part of the "trusted_headers" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` header, leading to a web cache poisoning issue. Versions 5.3.12 and later have a patch to ensure that the `X-Forwarded-Prefix` header is not forwarded to subrequests when it is not trusted.

  • CVE-2021-41267 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 >= 5.2.0, < 5.3.12

CVSS3 Score: 6.5 - MEDIUM

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

CVSS2 Score: 4.3 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
NONE PARTIAL NONE

CVE References

Description Tags Link
Webcache Poisoning via X-Forwarded-Prefix and sub-request · Advisory · symfony/symfony · GitHub github.com
text/html
URL Logo CONFIRM github.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q
Fix missing extra trusted header in sub-request · symfony/[email protected] · GitHub github.com
text/html
URL Logo MISC github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487
Release v5.3.12 · symfony/symfony · GitHub github.com
text/html
URL Logo MISC github.com/symfony/symfony/releases/tag/v5.3.12
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

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-2021-41267: Webcache Poisoning via X-Forwarded-Prefix and sub-request symfony.com/blog/cve-2021-… #symfony 2021-11-24 09:13:12
Twitter Icon @websagiles CVE-2021-41267: Webcache Poisoning via X-Forwarded-Prefix and sub-request dlvr.it/SD5tBn https://t.co/ph3IkcHDMn 2021-11-24 11:13:43
Twitter Icon @CVEreport CVE-2021-41267 : Symfony/Http-Kernel is the HTTP #kernel component for Symfony, a PHP framework for web and console… twitter.com/i/web/status/1… 2021-11-24 19:07:24
Reddit Logo Icon /r/symfony CVE-2021-41267: Webcache Poisoning via X-Forwarded-Prefix and sub-request 2021-11-24 10:00:10
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