[USN-3692-2] OpenSSL vulnerabilities

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Ubuntu Security Notice USN-3692-2
June 26, 2018

openssl vulnerabilities
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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