CVE-2021-41267
Symfony/Http-Kernel Cache Poisoning Via X-Forwarded-Prefix Header
Description
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.
INFO
Published Date :
Nov. 24, 2021, 7:15 p.m.
Last Modified :
Nov. 30, 2021, 6:52 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-41267.
| URL | Resource |
|---|---|
| https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487 | Patch Third Party Advisory |
| https://github.com/symfony/symfony/pull/44243 | Patch Third Party Advisory |
| https://github.com/symfony/symfony/releases/tag/v5.3.12 | Release Notes Third Party Advisory |
| https://github.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q | Patch Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-41267 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-41267 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Nov. 30, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Changed Reference Type https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487 No Types Assigned https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487 Patch, Third Party Advisory Changed Reference Type https://github.com/symfony/symfony/pull/44243 No Types Assigned https://github.com/symfony/symfony/pull/44243 Patch, Third Party Advisory Changed Reference Type https://github.com/symfony/symfony/releases/tag/v5.3.12 No Types Assigned https://github.com/symfony/symfony/releases/tag/v5.3.12 Release Notes, Third Party Advisory Changed Reference Type https://github.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q No Types Assigned https://github.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* versions from (including) 5.2.0 up to (excluding) 5.3.12
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-41267 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-41267
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.10 }} 0.01%
score
0.43476
percentile