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Windows NTLM Security Feature Bypass Vulnerability - CVE-2019-1338

oval:org.cisecurity:def:6647

A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a client is also sending LMv2 responses. An attacker who successfully exploited this vulnerability could gain the ability to downgrade NTLM security features. To exploit this vulnerability the attacker would need to be able to modify NTLM traffic exchange. The update addresses the vulnerability by hardening NTLMv2 protection on the server-side.

Family:
windows
Status:
ACCEPTED
Platform(s):
  • Microsoft Windows Server 2008
  • Microsoft Windows Server 2008 R2
  • Microsoft Windows 7
Class:
vulnerability
Reference(s):
  • CVE-2019-1338
  • MSRC-CVE-2019-1338
  • KB4520003
  • KB4520009
Product(s):