TOSS must not accept router advertisements on all IPv6 interfaces by default.
An XCCDF Rule
Description
<VulnDiscussion>Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network. An illicit router advertisement message could result in a man-in-the-middle attack.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-253120r991589_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure TOSS to not accept router advertisements on all IPv6 interfaces by default unless the system is a router with the following commands:
$ sudo sysctl -w net.ipv6.conf.default.accept_ra=0
If "0" is not the system's default value then add or update the following lines in the appropriate file under "/etc/sysctl.d":