CVE-2023-3823
Security issue with external entity loading in XML without enabling it
描述
In PHP versions 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 various XML functions rely on libxml global state to track configuration variables, like whether external entities are loaded. This state is assumed to be unchanged unless the user explicitly changes it by calling appropriate function. However, since the state is process-global, other modules - such as ImageMagick - may also use this library within the same process, and change that global state for their internal purposes, and leave it in a state where external entities loading is enabled. This can lead to the situation where external XML is parsed with external entities loaded, which can lead to disclosure of any local files accessible to PHP. This vulnerable state may persist in the same process across many requests, until the process is shut down.
如何修補 CVE-2023-3823
要修補 CVE-2023-3823,請將受影響套件升級到下列已修補版本。
- —升級至 8.0.30 或更新版本
- —升級至 8.0.30 或更新版本
- —升級至 8.0.30 或更新版本
CVE-2023-3823 正在被利用嗎?
低 — EPSS 為 1.2%,目前沒有觀察到大規模利用活動。
受影響套件(3)
- >= 8.0.0, < 8.0.30, >= 8.1.0, < 8.1.22, >= 8.2.0, < 8.2.9
- >= 8.0.0, < 8.0.30, >= 8.1.0, < 8.1.22, >= 8.2.0, < 8.2.9
- >= 8.0.0, < 8.0.30, >= 8.1.0, < 8.1.22, >= 8.2.0, < 8.2.9
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |