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OpenSSL DHE man-in-the-middle protection (CVE-2015-4000)

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OpenSSL DHE man-in-the-middle protection (CVE-2015-4000)

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
01/05/2012
Created
07/25/2018
Added
01/26/2012
Modified
05/04/2018

Description

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.

Solution(s)

  • http-openssl-upgrade-1_0_1n
  • http-openssl-upgrade-1_0_2b

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