CVE-2021-23336
Web Cache Poisoning
描述
The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.
如何修補 CVE-2021-23336
要修補 CVE-2021-23336,請將受影響套件升級到下列已修補版本。
- —升級至 2.2.19 或更新版本
- —升級至 3.6.13 或更新版本
- —升級至 3.6.13 或更新版本
- —升級至 3.6.13 或更新版本
CVE-2021-23336 正在被利用嗎?
中等 — EPSS 為 36.0%,可持續追蹤但非最高優先。
受影響套件(4)
- >= 2.2.0, < 2.2.19, >= 3.0.0, < 3.0.13, >= 3.1.0, < 3.1.7
- from 0, < 3.6.13, >= 3.7.0, < 3.7.10, >= 3.8.0, < 3.8.8, >= 3.9.0, < 3.9.2
- from 0, < 3.6.13, >= 3.7.0, < 3.7.10, >= 3.8.0, < 3.8.8, >= 3.9.0, < 3.9.2
- from 0, < 3.6.13, >= 3.7.0, < 3.7.10, >= 3.8.0, < 3.8.8, >= 3.9.0, < 3.9.2
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H |