CVE-2021-21703
PHP-FPM memory access in root process leading to privilege escalation
7.0
HIGH
CVSS 3.1
EPSS 1.3%
描述
In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.
如何修補 CVE-2021-21703
要修補 CVE-2021-21703,請將受影響套件升級到下列已修補版本。
- —升級至 7.3.32 或更新版本
- —升級至 7.3.32 或更新版本
- —升級至 7.3.32 或更新版本
- —升級至 7.0.33-0+deb9u12 或更新版本
- —升級至 7.3.31-1~deb10u1 或更新版本
- —升級至 7.4.25-1+deb11u1 或更新版本
- —升級至 7.4.25-1+deb11u1 或更新版本
CVE-2021-21703 正在被利用嗎?
低 — EPSS 為 1.3%,目前沒有觀察到大規模利用活動。
受影響套件(7)
- >= 7.3.0, < 7.3.32, >= 7.4.0, < 7.4.25, >= 8.0.0, < 8.0.12
- >= 7.3.0, < 7.3.32, >= 7.4.0, < 7.4.25, >= 8.0.0, < 8.0.12
- >= 7.3.0, < 7.3.32, >= 7.4.0, < 7.4.25, >= 8.0.0, < 8.0.12
- from 0, < 7.0.33-0+deb9u12
- from 0, < 7.3.31-1~deb10u1
- from 0, < 7.4.25-1+deb11u1
- from 0, < 7.4.25-1+deb11u1
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |