OpenControls Logo

STIG Viewer

SLEM 5 must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-261315SLEM-05-253020SV-261315r996415_ruleCCI-000366medium
Description
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.
STIGDate
SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide2025-05-08

Related Frameworks

4 paths across 3 frameworks
NIST 800-531 mapping
CM-6
1.00
  • DISA · 1 · disa_xccdf · related
  • DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1712 mappings
3.4.1
1.00
  • DISA · 1 · disa_xccdf · related
  • DISA · 2025-01-23 · disa_cci_list · equivalent
  • NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
3.4.2
1.00
  • DISA · 1 · disa_xccdf · related
  • DISA · 2025-01-23 · disa_cci_list · equivalent
  • NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
CCI1 mapping
CCI-000366
1.00
  • DISA · 1 · disa_xccdf · related

Details

Check Text (C-261315r996415_chk)

Verify SLEM 5 does not accept IPv4 ICMP redirect messages with the following command: > sudo sysctl net.ipv4.conf.all.accept_redirects net.ipv4.conf.all.accept_redirects = 0 If the network parameter "ipv4.conf.all.accept_redirects" is not equal to "0", or nothing is returned, this is a finding.

Fix Text (F-64952r996414_fix)

Configure SLEM 5 to not accept IPv4 ICMP redirect messages by running the following command as an administrator: > sudo sysctl -w net.ipv4.conf.all.accept_redirects=0 If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "net.ipv4.conf.all.accept_redirects=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system