Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-41267— Webcache Poisoning in Symfony

Quick assessment

Affected
symfony symfony
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sensio Labs Symfony是法国Sensio Labs公司的一套免费的、基于MVC架构的PHP开发框架。该框架提供常用的功能组件及工具，可用于快速创建复杂的WEB程序。 Symfony 中存在环境问题漏洞，攻击者可通过伪造包含“X-Forwarded-Prefix”报头的请求，从而导致网络缓存中毒。以下产品及版本受到影响：Symfony 5.2 版本。

CVSS 6.5 · Medium EPSS 1.28% · P69

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-41267

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Webcache Poisoning in Symfony
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Sensio Labs Symfony 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sensio Labs Symfony是法国Sensio Labs公司的一套免费的、基于MVC架构的PHP开发框架。该框架提供常用的功能组件及工具，可用于快速创建复杂的WEB程序。 Symfony 中存在环境问题漏洞，攻击者可通过伪造包含“X-Forwarded-Prefix”报头的请求，从而导致网络缓存中毒。以下产品及版本受到影响：Symfony 5.2 版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
symfony symfony >= 5.2.0, < 5.3.12 -

II. Public POCs for CVE-2021-41267

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-41267

请登录查看更多情报信息。

Patches & Fixes for CVE-2021-41267 (2)

Vendor Advisories for CVE-2021-41267 (1)

Other References for CVE-2021-41267 (1)

Same Patch Batch · symfony · 2021-11-24 · 3 CVEs total

CVE-2021-41270 6.5 MEDIUM CSV Injection in Symfony
CVE-2021-41268 6.5 MEDIUM Cookie persistence in Symfony

IV. Related Vulnerabilities

Same product: symfony
Same vendor: symfony
Same weakness: CWE-444

V. Comments for CVE-2021-41267

No comments yet

Leave a comment