STIGQter: STIG Summary: Intrusion Detection and Prevention Systems Security Requirements Guide Version: 3 Release: 4 Benchmark Date: 28 Oct 2025:

The IPS must block outbound Internet Control Message Protocol (ICMP) Destination Unreachable, Redirect, and Address Mask reply messages.

DISA Rule

SV-206893r1137740_rule

Vulnerability Number

V-206893

Group Title

SRG-NET-000273

Rule Version

SRG-NET-000273-IDPS-00198

Severity

CAT II

CCI(s)

• CCI-001312 - Generates error messages that provide information necessary for corrective actions without revealing information that could be exploited.

Weight

10

Fix Recommendation

Configure the IPS to block outbound ICMP Destination Unreachable, Redirect, and Address Mask reply messages.

An acceptable alternative to blocking all Destination Unreachable responses is to filter Destination Unreachable messages generated by the firewall implementation to allow ICMP Destination Unreachable--
Fragmentation Needed but DF Bit Set (Type 3, Code 4) and apply this filter to the external interfaces.

Check Contents

If the device being reviewed is an IDS, this is not applicable.

Verify the IPS blocks outbound ICMP Destination Unreachable, Redirect, and Address Mask reply messages.

If the IPS does not block outbound ICMP Destination Unreachable, Redirect, and Address Mask reply messages, this is a finding.

Vulnerability Number

V-206893

Documentable

False

Rule Version

SRG-NET-000273-IDPS-00198

Severity Override Guidance

If the device being reviewed is an IDS, this is not applicable.

Verify the IPS blocks outbound ICMP Destination Unreachable, Redirect, and Address Mask reply messages.

If the IPS does not block outbound ICMP Destination Unreachable, Redirect, and Address Mask reply messages, this is a finding.

Check Content Reference

M

Target Key

2918