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All shell files must not have extended ACLs.


Overview

Finding ID Version Rule ID IA Controls Severity
V-22366 GEN002230 SV-45175r1_rule Medium
Description
Shells with world/group write permissions give the ability to maliciously modify the shell to obtain unauthorized access.
STIG Date
SUSE Linux Enterprise Server v11 for System z 2016-12-20

Details

Check Text ( C-42520r1_chk )
If /etc/shells exists, check the permissions of each shell referenced.
# cat /etc/shells | xargs -n1 ls -lL

Otherwise, check any shells found on the system.
# find / -name "*sh" | xargs -n1 ls -lL

If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.
Fix Text (F-38573r1_fix)
Remove the extended ACL from the file.
# setfacl --remove-all [shell]