Advisory Published

USN-3692-1: OpenSSL vulnerabilities

First published: Tue Jun 26 2018(Updated: )

Keegan Ryan discovered that OpenSSL incorrectly handled ECDSA key generation. An attacker could possibly use this issue to perform a cache-timing attack and recover private ECDSA keys. (CVE-2018-0495) Guido Vranken discovered that OpenSSL incorrectly handled very large prime values during a key agreement. A remote attacker could possibly use this issue to consume resources, leading to a denial of service. (CVE-2018-0732) 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. (CVE-2018-0737)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libssl1.0.0<1.0.2n-1ubuntu5.1
1.0.2n-1ubuntu5.1
=18.04
All of
ubuntu/libssl1.1<1.1.0g-2ubuntu4.1
1.1.0g-2ubuntu4.1
=18.04
All of
ubuntu/libssl1.0.0<1.0.2g-1ubuntu13.6
1.0.2g-1ubuntu13.6
=17.10
All of
ubuntu/libssl1.0.0<1.0.2g-1ubuntu4.13
1.0.2g-1ubuntu4.13
=16.04
All of
ubuntu/libssl1.0.0<1.0.1f-1ubuntu2.26
1.0.1f-1ubuntu2.26
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-3692-1?

    The severity of USN-3692-1 is high.

  • How can an attacker exploit the vulnerability in USN-3692-1?

    An attacker can exploit the vulnerability in USN-3692-1 to perform a cache-timing attack and recover private ECDSA keys.

  • Which software versions are affected by USN-3692-1?

    The affected software versions are libssl1.0.0 version 1.0.2n-1ubuntu5.1 and libssl1.1 version 1.1.0g-2ubuntu4.1.

  • How can the vulnerability in USN-3692-1 be fixed?

    The vulnerability in USN-3692-1 can be fixed by updating the libssl1.0.0 package to version 1.0.2n-1ubuntu5.1 or updating the libssl1.1 package to version 1.1.0g-2ubuntu4.1.

  • Where can I find more information about USN-3692-1?

    You can find more information about USN-3692-1 on the Ubuntu Security website.

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