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CVE-2015-4000

Public on 2015-05-21
Modified on 2015-08-24
Description

A flaw was found in the way the TLS protocol composes the Diffie-Hellman exchange (for both export and non-export grade cipher suites). An attacker could use this flaw to downgrade a DHE connection to use export-grade key sizes, which could then be broken by sufficient pre-computation. This can lead to a passive man-in-the-middle attack in which the attacker is able to decrypt all traffic.

Severity
Medium
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CVSS v3 Base Score
3.7
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 java-1.6.0-openjdk 2015-08-24 22:26 ALAS-2015-586
Amazon Linux 1 java-1.7.0-openjdk 2015-07-22 10:00 ALAS-2015-570
Amazon Linux 1 java-1.8.0-openjdk 2015-07-22 10:00 ALAS-2015-571
Amazon Linux 1 nss 2015-07-22 10:00 ALAS-2015-569
Amazon Linux 1 nss-util 2015-07-22 10:00 ALAS-2015-569
Amazon Linux 1 openssl 2015-06-16 11:29 ALAS-2015-550

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv2 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N
Amazon Linux CVSSv3 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD CVSSv2 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
NVD CVSSv3 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N