CVE-2020-5217
Directive injection when using dynamic overrides with user input
描述
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.
如何修補 CVE-2020-5217
要修補 CVE-2020-5217,請將受影響套件升級到下列已修補版本。
- —升級至 6.3.1-1 或更新版本
- —升級至 6.2.0 或更新版本
CVE-2020-5217 正在被利用嗎?
低 — EPSS 為 1.8%,目前沒有觀察到大規模利用活動。
受影響套件(2)
- from 0, < 6.3.1-1
- >= 6.0.0, < 6.2.0
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.4 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N |