要点
- CVE-2021-4034 是影响 http server (oracle), zfs storage appliance kit (oracle), polkit (polkit project) 的高危 (CVSS 7.8)漏洞。
- 已被实际利用：CISA 于 27/06/2022 将其加入 KEV 目录。
- 未来 30 天内被利用的概率（EPSS）：94.9%，高于 99.9% 的漏洞。
- 修复：升级到 121, 3.3.0 或更高版本。
Description
A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.
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