Advisory Published

USN-4504-1: OpenSSL vulnerabilities

First published: Wed Sep 16 2020(Updated: )

Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky discovered that certain Diffie-Hellman ciphersuites in the TLS specification and implemented by OpenSSL contained a flaw. A remote attacker could possibly use this issue to eavesdrop on encrypted communications. This was fixed in this update by removing the insecure ciphersuites from OpenSSL. (CVE-2020-1968) Cesar Pereida García, Sohaib ul Hassan, Nicola Tuveri, Iaroslav Gridin, Alejandro Cabrera Aldaya, and Billy Brumley discovered that OpenSSL incorrectly handled ECDSA signatures. An attacker could possibly use this issue to perform a timing side-channel attack and recover private ECDSA keys. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1547) Guido Vranken discovered that OpenSSL incorrectly performed the x86_64 Montgomery squaring procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1551) Bernd Edlinger discovered that OpenSSL incorrectly handled certain decryption functions. In certain scenarios, a remote attacker could possibly use this issue to perform a padding oracle attack and decrypt traffic. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1563)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libssl1.0.0<1.0.2n-1ubuntu5.4
1.0.2n-1ubuntu5.4
=18.04
All of
ubuntu/libssl1.0.0<1.0.2g-1ubuntu4.17
1.0.2g-1ubuntu4.17
=16.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID?

    The vulnerability ID is USN-4504-1.

  • What is the severity of USN-4504-1?

    The severity of USN-4504-1 is medium.

  • How does the vulnerability in OpenSSL affect communications?

    The vulnerability allows remote attackers to potentially eavesdrop on encrypted communications.

  • Which version of libssl1.0.0 is affected by USN-4504-1?

    The versions up to and including libssl1.0.0 1.0.2n-1ubuntu5.4 are affected.

  • How do I fix the vulnerability in libssl1.0.0?

    To fix the vulnerability, update libssl1.0.0 to version 1.0.2n-1ubuntu5.4 or later.

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