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The system must ignore ICMPv6 redirects by default.


Overview

Finding ID Version Rule ID IA Controls Severity
V-38548 RHEL-06-000099 SV-50349r3_rule Medium
Description
An illicit ICMP redirect message could result in a man-in-the-middle attack.
STIG Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2017-04-28

Details

Check Text ( None )
None
Fix Text (F-43496r1_fix)
To set the runtime status of the "net.ipv6.conf.default.accept_redirects" kernel parameter, run the following command:

# sysctl -w net.ipv6.conf.default.accept_redirects=0

If this is not the system's default value, add the following line to "/etc/sysctl.conf":

net.ipv6.conf.default.accept_redirects = 0