Detections
Analytics
GEN003607 - The system must not accept source-routed IPv4 packets - 'net.ipv4.conf.all.accept_source_route'
Information
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. This requirement applies only to the handling of source-routed traffic destined to the system itself, not to traffic forwarded by the system to another system, such as when IPv4 forwarding is enabled and the system is functioning as a router.Solution
Configure the system to not accept source-routed IPv4 packets.Edit /etc/sysctl.conf and add a setting for 'net.ipv4.conf.all.accept_source_route=0' and 'net.ipv4.conf.default.accept_source_route=0'.
Reload the sysctls.
Procedure:
# sysctl -p
See Also
http://iasecontent.disa.mil/stigs/zip/U_RedHat_5_V1R18_STIG.zip
Item Details
Category: ACCESS CONTROL
References: 800-53|AC-4, CAT|II, CCI|CCI-001551, Group-ID|V-22414, Rule-ID|SV-37622r1_rule, STIG-ID|GEN003607, Vuln-ID|V-22414
Plugin: Unix
Control ID: 1e9a8a0dd54f79ac88926291cdbe0d9035aad6877bd886334846dec3d0e2f6e3