CVE-2019-18276

描述

An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support "saved UID" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.

如何修補 CVE-2019-18276

要修補 CVE-2019-18276,請將受影響套件升級到下列已修補版本。

• —升級至 5.1~rc1-2 或更新版本

CVE-2019-18276 正在被利用嗎?

低 — EPSS 為 2.6%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 5.1~rc1-2

CVSS 分數

參考連結(1)

• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-18276