HTTP Request Smuggling The advisory has been revoked - it doesn't affect any version of package symfony (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2404-SYMFONY-6707489
- published29 Apr 2024
- disclosed24 Nov 2021
Introduced: 24 Nov 2021
CVE-2021-41267 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:24.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream symfony package and not the symfony package as distributed by Ubuntu.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2021-41267
- https://github.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q
- https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487
- https://github.com/symfony/symfony/pull/44243
- https://github.com/symfony/symfony/releases/tag/v5.3.12