The system must prevent local applications from generating source-routed packets.

From HP-UX 11.31 Security Technical Implementation Guide

Associated with: CCI-001551

SV-29707r2_rule The system must prevent local applications from generating source-routed packets.

Vulnerability discussion

Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures.

Check content

Check the system for an IP Filter (IPF) rule blocking outgoing source-routed packets. # ipfstat -o Examine the list for rules such as: block out log quick [all] | [from any to any] with opt lsrr block out log quick [all] | [from any to any] with opt ssrr If the listed rules do not block both lsrr and ssrr options, this is a finding.

Fix text

Edit /etc/opt/ipf/ipf.conf and add rules to block outgoing source-routed packets, such as: block out log quick [all] | [from any to any] with opt lsrr block out log quick [all] | [from any to any] with opt ssrr Reload the IPF rules: # ipf -Fa -A -f /etc/opt/ipf/ipf.conf

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.