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CVE-2020-5255— Prevent cache poisoning via a Response Content-Type header

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。 Sensio Labs Symfony 4.4之前版本中存在安全漏洞。攻击者可利用该漏洞造成用户无法使用网站。

CVSS 2.6 · Low EPSS 1.30% · P69

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2020-5255

Vulnerability Information
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Vulnerability Title
Prevent cache poisoning via a Response Content-Type header
Source: CVE Program / CVE List V5
Vulnerability Description
In Symfony before versions 4.4.7 and 5.0.7, when a `Response` does not contain a `Content-Type` header, affected versions of Symfony can fallback to the format defined in the `Accept` header of the request, leading to a possible mismatch between the response's content and `Content-Type` header. When the response is cached, this can prevent the use of the website by other users. This has been patched in versions 4.4.7 and 5.0.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
交互错误
Source: CVE Program / CVE List V5
Vulnerability Title
Sensio Labs Symfony 输入验证错误漏洞
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。 Sensio Labs Symfony 4.4之前版本中存在安全漏洞。攻击者可利用该漏洞造成用户无法使用网站。
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 >= 4.4.0 and < 4.4.7 -

II. Public POCs for CVE-2020-5255

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III. Intelligence Information for CVE-2020-5255

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Patches & Fixes for CVE-2020-5255 (1)

Vendor Advisories for CVE-2020-5255 (1)

Mailing List Discussions for CVE-2020-5255 (1)

Security Blog Posts for CVE-2020-5255 (1)

Same Patch Batch · symfony · 2020-03-30 · 3 CVEs total

CVE-2020-5275 7.6 HIGH Firewall configured with unanimous strategy was not actually unanimous in symfony/security
CVE-2020-5274 4.6 MEDIUM Exceptions displayed in non-debug configurations in Symfony

IV. Related Vulnerabilities

Same product: symfony
Same vendor: symfony
Same weakness: CWE-435

V. Comments for CVE-2020-5255

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