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Check: GEN002230

SUSE Linux Enterprise Server v11 for System z STIG: GEN002230 (in versions v1 r12 through v1 r9)

Title

All shell files must not have extended ACLs. (Cat II impact)

Discussion

Shells with world/group write permissions give the ability to maliciously modify the shell to obtain unauthorized access.

Check Content

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

Remove the extended ACL from the file. # setfacl --remove-all [shell]

Additional Identifiers

Rule ID: SV-45175r1_rule

Vulnerability ID: V-22366

Group Title: GEN002230

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-000225	Employ the principle of least privilege, allowing only authorized accesses for users (or processes acting on behalf of users) which are necessary to accomplish assigned organizational tasks.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-6	Least Privilege