BIND 9 vulnerability

What happened

BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments. This issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

Affected versions

BIND 9: 9.0.0 through 9.16.50 (custom); 9.18.0 through 9.18.48 (custom); 9.20.0 through 9.20.22 (custom); 9.21.0 through 9.21.21 (custom); 9.9.3-S1 through 9.16.50-S1 (custom); 9.18.11-S1 through 9.18.48-S1 (custom); 9.20.9-S1 through 9.20.22-S1 (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.