(MS15-055) Vulnerability in Schannel Could Allow Information Disclosure (3061518)

Publish date: May 19, 2015
  Severity: HIGH
  CVE Identifier: CVE-2015-1716
  Advisory Date: MAY 19, 2015

  DESCRIPTION

This security update addresses a vulnerability in Microsoft Windows, which could allow information disclosure when Secure Channel (Schannel) allows the use of a weak Diffie-Hellman ephemeral (DFE) key length of 512 bits in an encrypted TLS session. Allowing 512-bit DHE keys makes DHE key exchanges weak and vulnerable to various attacks. A server needs to support 512-bit DHE key lengths for an attack to be successful; the minimum allowable DHE key length in default configurations of Windows servers is 1024 bits.

  SOLUTION

  AFFECTED SOFTWARE AND VERSION

  • Windows Server 2003 Service Pack 2
  • Windows Server 2003 x64 Edition Service Pack 2
  • Windows Server 2003 with SP2 for Itanium-based Systems
  • Windows Vista Service Pack 2
  • Windows Vista x64 Edition Service Pack 2
  • Windows Server 2008 for Itanium-based Systems Service Pack 2
  • Windows 8.1 for x64-based Systems
  • Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2012 R2 (Server Core installation)
  • Windows Server 2008 for 32-bit Systems Service Pack 2
  • Windows Server 2008 for x64-based Systems Service Pack 2
  • Windows 7 for 32-bit Systems Service Pack 1
  • Windows 7 for x64-based Systems Service Pack 1
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
  • Windows 8 for 32-bit Systems
  • Windows 8 for x64-based Systems
  • Windows 8.1 for 32-bit Systems
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows RT
  • Windows RT 8.1
  • Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
  • Windows Server 2012 (Server Core installation)

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