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Check: GEN004390

IRIX 6.5: GEN004390 (in versions v1 r1 through v1 r0.99)

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 email.

Check Content

Check the permissions of the alias file and the hashed version of it used by sendmail. Procedure: # ls -D /etc/aliases If the file has an extended ACL, this is a finding.

Fix Text

Remove the extended ACL from the files. # chmod A- /etc/aliases

Additional Identifiers

Rule ID:

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