CVE-2021-43411 Information

Description

An issue was discovered in GNU Hurd before 0.9 20210404-9. When trying to exec a setuid executable there’s a window of time when the process already has the new privileges but still refers to the old task and is accessible through the old process port. This can be exploited to get full root access.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://salsa.debian.org/hurd-team/hurd/-/blob/4d1b079411e2f40576e7b58f9b5b78f733a2beda/debian/patches/0034-proc-Use-UIDs-for-evaluating-permissions.patch https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html https://www.mail-archive.com/bug-hurd@gnu.org/msg32112.html

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.5