The system must disable TCP reverse IP source routing.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| low | V-216140 | SRG-OS-000480 | SOL-11.1-050100 | SV-216140r959010_rule | 2026-02-19 | 3 |
Description
If enabled, reverse IP source routing would allow an attacker to more easily complete a three-way TCP handshake and spoof new connections.
ℹ️ Check
Determine if TCP reverse IP source routing is disabled.
# ipadm show-prop -p _rev_src_routes -co current tcp
If the output of this command is not "0", this is a finding.
✔️ Fix
The Network Management profile is required.
Disable reverse source routing.
# pfexec ipadm set-prop -p _rev_src_routes=0 tcp