MS15-055 - Important: Vulnerability in Schannel Could Allow Information Disclosure...

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  1. News

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    Jun 27, 2006
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    Severity Rating: Important
    Revision Note: V1.0 (May 12, 2015): Bulletin published.
    Summary: This security update resolves a vulnerability in Microsoft Windows. The vulnerability 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.

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