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Ubuntu Security Notice USN-3692-2

Ubuntu Security Notice USN-3692-2
Posted Jun 26, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3692-2 - USN-3692-1 fixed a vulnerability in OpenSSL. This update provides the corresponding update for Ubuntu 12.04 ESM. 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. Various other issues were also addressed.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2017-0737, CVE-2018-0495, CVE-2018-0732, CVE-2018-0737
SHA-256 | c9a4413cce1293192cef94ae1323f4ac3f80a693b84d4dd16582f330058c726d

Ubuntu Security Notice USN-3692-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3692-2
June 26, 2018

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

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

- 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-3692-1 fixed a vulnerability in OpenSSL. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

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)

Update instructions:

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

Ubuntu 12.04 ESM:
libssl1.0.0 1.0.1-4ubuntu5.43

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

References:
https://usn.ubuntu.com/usn/usn-3692-2
https://usn.ubuntu.com/usn/usn-3692-1
CVE-2017-0737, CVE-2018-0495, CVE-2018-0732, CVE-2018-0737
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