(MS15-055) Vulnerability in Schannel Could Allow Information Disclosure (3061518)
2015年5月19日
危険度: 高
CVE識別番号: CVE-2015-1716
情報公開日: 5 19, 2015
概要
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.
対応方法
影響を受けるソフトウェア
- 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)