Advisory Published

USN-3628-1: OpenSSL vulnerability

First published: Thu Apr 19 2018(Updated: )

Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis Manuel Alvarez Tapia discovered that OpenSSL incorrectly handled RSA key generation. An attacker could possibly use this issue to perform a cache-timing attack and recover private RSA keys.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libssl1.0.0<1.0.2g-1ubuntu13.5
1.0.2g-1ubuntu13.5
Ubuntu OpenSSH Client=17.10
All of
ubuntu/libssl1.0.0<1.0.2g-1ubuntu4.12
1.0.2g-1ubuntu4.12
Ubuntu OpenSSH Client=16.04
All of
ubuntu/libssl1.0.0<1.0.1f-1ubuntu2.25
1.0.1f-1ubuntu2.25
Ubuntu OpenSSH Client=14.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the USN for this OpenSSL vulnerability?

    The USN for this OpenSSL vulnerability is USN-3628-1.

  • Who discovered the OpenSSL vulnerability?

    Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia, and Luis Manuel Alvarez Tapia discovered the OpenSSL vulnerability.

  • What is the impact of this OpenSSL vulnerability?

    The OpenSSL vulnerability allows an attacker to perform a cache-timing attack and recover private RSA keys.

  • Which versions of libssl1.0.0 are affected by this vulnerability?

    The versions affected by this OpenSSL vulnerability are 1.0.2g-1ubuntu13.5, 1.0.2g-1ubuntu4.12, and 1.0.1f-1ubuntu2.25.

  • How can I fix this OpenSSL vulnerability?

    To fix this OpenSSL vulnerability, update libssl1.0.0 to the appropriate remedial versions: 1.0.2g-1ubuntu13.5, 1.0.2g-1ubuntu4.12, or 1.0.1f-1ubuntu2.25.

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