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Cryptographic Issues Affecting openssl package, versions <1.0.1-4ubuntu5.28

Severity

 Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
99.86% (100th percentile)

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  • Snyk IDSNYK-UBUNTU1204-OPENSSL-374555
  • published21 May 2015
  • disclosed21 May 2015
Report a new vulnerability Found a mistake?

Introduced: 21 May 2015

CVE-2015-4000  (opens in a new tab)
CWE-310  (opens in a new tab)

How to fix?

Upgrade Ubuntu:12.04 openssl to version 1.0.1-4ubuntu5.28 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Ubuntu. See How to fix? for Ubuntu:12.04 relevant fixed versions and status.

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.

References