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VuXML IDDescription
2ed7e8db-e234-11ea-9392-002590bc43besysutils/openzfs-kmod -- critical permissions issues

Andrew Walker reports:

Issue 1:

Users are always granted permissions to cd into a directory. The check for whether execute is present on directories is a de-facto no-op. This cannot be mitigated without upgrading. Even setting an explicit "deny - execute" NFSv4 ACE will be bypassed.

Issue 2:

All ACEs for the owner_group (group@) and regular groups (group:) are granted the current user. This means that POSIX mode 770 is de-facto 777, and the below ACL is also de-facto 777 because the groupmember check for builtin_administrators returns True. 

root@TESTBOX[~]# getfacl testfile
# file: testfile
# owner: root
# group: wheel
group:builtin_administrators:rwxpDdaARWcCos:-------:allow

Discovery 2020-08-13
Entry 2020-08-20
openzfs-kmod
< 2020081800

ports/248787
https://github.com/openzfs/zfs/commit/716b53d0a14c72bda16c0872565dd1909757e73f
https://reviews.freebsd.org/D26107