The SMTP service must not use .forward files.

From VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide

Associated with: CCI-000382

SV-99199r1_rule The SMTP service must not use .forward files.

Vulnerability discussion

The .forward file allows users to automatically forward mail to another system. Use of .forward files could allow the unauthorized forwarding of mail and could potentially create mail loops that could degrade system performance.

Check content

Check forwarding from sendmail: # grep "0 ForwardPath" /etc/sendmail.cf If the entry contains a file path and is not commented out, this is a finding.

Fix text

Disable forwarding for sendmail and remove ".forward" files from the system: Remove all ".forward" files on the system. # find / -name .forward -delete Use the following command to disable forwarding: # sed -i "s/O ForwardPath/#O ForwardPath/" /etc/sendmail.cf Restart the sendmail service: # service sendmail restart

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.