Why is the user able to execute chmod even in tftp session even it's executable permission removed using ACL ?

Solution Verified - Updated -

Issue

  • The user is able to execute chmod successfully even if the executable permission has been revoked from the same using File Access Control List.
root@localhost test]# setfacl -m u:test:--- /bin/chmod
[root@localhost test]# getfacl /bin/chmod
getfacl: Removing leading '/' from absolute path names
# file: bin/chmod
# owner: root
# group: root
user::rwx
user:test:---
group::r-x
mask::r-x
other::r-x

Environment

  • Red Hat Enterprise Linux 6

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