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Check: GEN007920

SUSE Linux Enterprise Server v11 for System z STIG: GEN007920 (in versions v1 r12 through v1 r9)

Title

The system must not forward IPv6 source-routed packets. (Cat II impact)

Discussion

Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv6 forwarding is enabled and the system is functioning as a router.

Check Content

Determine if the system is configured to forward IPv6 source-routed packets. Procedure: # sysctl net.ipv6.conf.all.forwarding # sysctl net.ipv6.conf.default.forwarding If any value of the entries is not = "0", this is a finding.

Fix Text

Configure the system to not forward IPv6 source-routed packets. Procedure: Edit the /etc/sysctl.conf file to include: net.ipv6.conf.all.forwarding = 0 net.ipv6.conf.default.forwarding = 0 Reload the kernel parameters: # sysctl -p

Additional Identifiers

Rule ID: SV-45992r1_rule

Vulnerability ID: V-22553

Group Title: GEN007920

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-001551	The organization defines approved authorizations for controlling the flow of information between interconnected systems.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-4	Information Flow Enforcement