USN-3840-1: OpenSSL vulnerabilities

openssl, openssl1.0 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 18.10
Ubuntu 18.04 LTS
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS

Summary

Several security issues were fixed in OpenSSL.

Software Description

openssl – Secure Socket Layer (SSL) cryptographic library and tools
openssl1.0 – Secure Socket Layer (SSL) cryptographic library and tools

Details

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)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.10: libssl1.0.0 – 1.0.2n-1ubuntu6.1; libssl1.1 – 1.1.1-1ubuntu2.1
Ubuntu 18.04 LTS: libssl1.0.0 – 1.0.2n-1ubuntu5.2; libssl1.1 – 1.1.0g-2ubuntu4.3
Ubuntu 16.04 LTS: libssl1.0.0 – 1.0.2g-1ubuntu4.14
Ubuntu 14.04 LTS: libssl1.0.0 – 1.0.1f-1ubuntu2.27

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

Source: USN-3840-1: OpenSSL vulnerabilities

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