Vulnerability Details CVE-2021-43411
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 62.2%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 8.5
References
- https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html
- https://salsa.debian.org/hurd-team/hurd/-/blob/4d1b079411e2f40576e7b58f9b5b78f733a2beda/debian/patches/0034-proc-Use-UIDs-for-evaluating-permissions.patch
- https://www.mail-archive.com/bug-hurd%40gnu.org/msg32112.html
- https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html
- https://salsa.debian.org/hurd-team/hurd/-/blob/4d1b079411e2f40576e7b58f9b5b78f733a2beda/debian/patches/0034-proc-Use-UIDs-for-evaluating-permissions.patch
- https://www.mail-archive.com/bug-hurd%40gnu.org/msg32112.html