USN-3840-1: OpenSSL vulnerabilities

Published Dec 6, 2018
·
Updated

Samuel Weiser discovered that OpenSSL incorrectly handled DSA signing. An attacker could possibly use this issue to perform a timing side-channel attack and recover private DSA keys. (CVE-2018-0734) Samuel Weiser discovered that OpenSSL incorrectly handled ECDSA signing. 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 and Ubuntu 18.10. (CVE-2018-0735) Billy Bob Brumley, Cesar Pereida Garcia, Sohaib ul Hassan, Nicola Tuveri, and Alejandro Cabrera Aldaya discovered that Simultaneous Multithreading (SMT) architectures are vulnerable to side-channel leakage. This issue is known as "PortSmash". An attacker could possibly use this issue to perform a timing side-channel attack and recover private keys. (CVE-2018-5407)

Affected Software

13 affected componentsFixes available
OpenSSL OpenSSL
All of the following
ubuntu/libssl1.0.0<1.0.2n-1ubuntu6.1
1.0.2n-1ubuntu6.1
Ubuntu Ubuntu=18.10
All of the following
ubuntu/libssl1.1<1.1.1-1ubuntu2.1
1.1.1-1ubuntu2.1
Ubuntu Ubuntu=18.10
All of the following
ubuntu/libssl1.0.0<1.0.2n-1ubuntu5.2
1.0.2n-1ubuntu5.2
Ubuntu Ubuntu=18.04
All of the following
ubuntu/libssl1.1<1.1.0g-2ubuntu4.3
1.1.0g-2ubuntu4.3
Ubuntu Ubuntu=18.04
All of the following
ubuntu/libssl1.0.0<1.0.2g-1ubuntu4.14
1.0.2g-1ubuntu4.14
Ubuntu Ubuntu=16.04
All of the following
ubuntu/libssl1.0.0<1.0.1f-1ubuntu2.27
1.0.1f-1ubuntu2.27
Ubuntu Ubuntu=14.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/libssl1.0.0 to a version that resolves this vulnerability.

    Fixed in 1.0.2n-1ubuntu6.1
  2. Upgrade

    Upgrade ubuntu/libssl1.1 to a version that resolves this vulnerability.

    Fixed in 1.1.1-1ubuntu2.1
  3. Upgrade

    Upgrade ubuntu/libssl1.0.0 to a version that resolves this vulnerability.

    Fixed in 1.0.2n-1ubuntu5.2
  4. Upgrade

    Upgrade ubuntu/libssl1.1 to a version that resolves this vulnerability.

    Fixed in 1.1.0g-2ubuntu4.3
  5. Upgrade

    Upgrade ubuntu/libssl1.0.0 to a version that resolves this vulnerability.

    Fixed in 1.0.2g-1ubuntu4.14
  6. Upgrade

    Upgrade ubuntu/libssl1.0.0 to a version that resolves this vulnerability.

    Fixed in 1.0.1f-1ubuntu2.27

Event History

Dec 6, 2018
Advisory Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
DescriptionAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

1

What is the vulnerability ID for this OpenSSL vulnerability?

The vulnerability ID for this OpenSSL vulnerability is CVE-2018-0734.

2

What is the severity of this OpenSSL vulnerability?

The severity of this OpenSSL vulnerability is not specified in the information provided.

3

How does the OpenSSL vulnerability CVE-2018-0734 impact the system?

The OpenSSL vulnerability CVE-2018-0734 can allow an attacker to perform a timing side-channel attack and recover private DSA keys.

4

How can I check if I am affected by the OpenSSL vulnerability CVE-2018-0734?

To check if you are affected by the OpenSSL vulnerability CVE-2018-0734, you can refer to the affected software section in the USN-3840-1 advisory.

5

How do I fix the OpenSSL vulnerability CVE-2018-0734?

To fix the OpenSSL vulnerability CVE-2018-0734, update the libssl1.0.0 package to version 1.0.2n-1ubuntu6.1 or later.

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