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Check: GEN004390

Solaris 9 X86 STIG: GEN004390 (in version v1 r9)

Title

The alias file must not have an extended ACL. (Cat II impact)

Discussion

Excessive permissions on the aliases file may permit unauthorized modification. If the alias file is modified by an unauthorized user, they may modify the file to run malicious code or redirect e-mail.

Check Content

Find the alias files on the system. Procedure: # egrep '^O(A| AliasFile)' /etc/mail/sendmail.cf If the "alias file" is an NIS or LDAP map, this check is not applicable. The default location is /etc/mail/aliases. Check the permissions of the alias file and the hashed version of it used by sendmail. Procedure: # ls -lL /etc/mail/aliases /etc/mail/aliases.db If the permissions include a "+", the file has an extended ACL and this is a finding.

Fix Text

Remove the extended ACL from the files. # getfacl /etc/mail/aliases /etc/mail/aliases.db Remove each ACE from the files. # setfacl -d [ACE] /etc/mail/aliases /etc/mail/aliases.db

Additional Identifiers

Rule ID: SV-26686r1_rule

Vulnerability ID: V-22439

Group Title:

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-000225	The organization employs the concept of least privilege, allowing only authorized accesses for users (and processes acting on behalf of users) which are necessary to accomplish assigned tasks in accordance with organizational missions and business functions.

Controls

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

Number	Title
AC-6	Least Privilege