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CVE-2020-5217— Directive injection when using dynamic overrides with user input in RubyGems secure_headers

Quick assessment

Affected
Twitter secure_headers
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.

RubyGems是RubyGems（Rubygems）组织的一款Ruby程序包管理器。该产品主要用于发布和管理Ruby程序包。 RubyGem secure_headers 3.8.0版本、5.1.0版本和6.2.0之前版本中存在注入漏洞。该漏洞源于用户输入构造命令、数据结构或记录的操作过程中，网络系统或产品缺乏对用户输入数据的正确验证，未过滤或未正确过滤掉其中的特殊元素，导致系统或产品产生解析或解释方式错误。

CVSS 4.4 · Medium EPSS 1.83% · P78

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-5217

Vulnerability Information
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Vulnerability Title
Directive injection when using dynamic overrides with user input in RubyGems secure_headers
Source: CVE Program / CVE List V5
Vulnerability Description
In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.8.0, 5.1.0, and 6.2.0. If user-supplied input was passed into append/override_content_security_policy_directives, a semicolon could be injected leading to directive injection. This could be used to e.g. override a script-src directive. Duplicate directives are ignored and the first one wins. The directives in secure_headers are sorted alphabetically so they pretty much all come before script-src. A previously undefined directive would receive a value even if SecureHeaders::OPT_OUT was supplied. The fixed versions will silently convert the semicolons to spaces and emit a deprecation warning when this happens. This will result in innocuous browser console messages if being exploited/accidentally used. In future releases, we will raise application errors resulting in 500s. Depending on what major version you are using, the fixed versions are 6.2.0, 5.1.0, 3.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
动态执行代码中指令转义处理不恰当(Eval注入)
Source: CVE Program / CVE List V5
Vulnerability Title
RubyGems 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RubyGems是RubyGems（Rubygems）组织的一款Ruby程序包管理器。该产品主要用于发布和管理Ruby程序包。 RubyGem secure_headers 3.8.0版本、5.1.0版本和6.2.0之前版本中存在注入漏洞。该漏洞源于用户输入构造命令、数据结构或记录的操作过程中，网络系统或产品缺乏对用户输入数据的正确验证，未过滤或未正确过滤掉其中的特殊元素，导致系统或产品产生解析或解释方式错误。
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
Twitter secure_headers < 3.8.0 -

II. Public POCs for CVE-2020-5217

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III. Intelligence Information for CVE-2020-5217

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Patches & Fixes for CVE-2020-5217 (2)

Vendor Advisories for CVE-2020-5217 (1)

Other References for CVE-2020-5217 (1)

IV. Related Vulnerabilities

Same product: secure_headers
Same vendor: Twitter
Same weakness: CWE-95

V. Comments for CVE-2020-5217

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