Microsoft SQL Server 2017 (CU 31) vulnerability

What happened

Improper link resolution before file access ('link following') in SQL Server allows an authorized attacker to elevate privileges over a network.

Affected versions

Microsoft SQL Server 2017 (CU 31): 14.0.0 through before 14.0.3550.4 (custom); 14.0.0 through before 14.0.2130.4 (custom); 15.0.0.0 through before 15.0.4490.9 (custom); 15.0.0 through before 15.0.2190.7 (custom); 16.0.0.0 through before 16.0.4275.2 (custom); 16.0.0 through before 16.0.1200.5 (custom); 17.0.0.0 through before 17.0.4085.5 (custom); 17.0.1050.2 through before 17.0.1135.8 (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.