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Ubuntu Security Notice USN-4376-2

Ubuntu Security Notice USN-4376-2
Posted Jul 9, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4376-2 - USN-4376-1 fixed several vulnerabilities in OpenSSL. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. Cesar Pereida Garc

tags | advisory, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-1547, CVE-2019-1559, CVE-2019-1563
MD5 | 5ffe6bab9ab65abc32cc3f1b5a2aa54b

Ubuntu Security Notice USN-4376-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4376-2
July 09, 2020

openssl vulnerabilities
==========================================================================

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in OpenSSL.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

USN-4376-1 fixed several vulnerabilities in OpenSSL. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

Cesar Pereida GarcĂ­a, 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. (CVE-2019-1547)

Juraj Somorovsky, Robert Merget, and Nimrod Aviram discovered that certain
applications incorrectly used OpenSSL and could be exposed to a padding
oracle attack. A remote attacker could possibly use this issue to decrypt
data. (CVE-2019-1559)

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. (CVE-2019-1563)

Update instructions:

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

Ubuntu 14.04 ESM:
libssl1.0.0 1.0.1f-1ubuntu2.27+esm1

Ubuntu 12.04 ESM:
libssl1.0.0 1.0.1-4ubuntu5.44

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

References:
https://usn.ubuntu.com/4376-2
https://usn.ubuntu.com/4376-1
CVE-2019-1547, CVE-2019-1559, CVE-2019-1563
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