=========================================================================Ubuntu Security Notice USN-2830-1
December 07, 2015

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

- Ubuntu 15.10
- Ubuntu 15.04
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

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

Details:

Guy Leaver discovered that OpenSSL incorrectly handled a ServerKeyExchange
for an anonymous DH ciphersuite with the value of p set to 0. A remote
attacker could possibly use this issue to cause OpenSSL to crash, resulting
in a denial of service. This issue only applied to Ubuntu 15.10.
(CVE-2015-1794)

Hanno Böck discovered that the OpenSSL Montgomery squaring procedure
algorithm may produce incorrect results when being used on x86_64. A remote
attacker could possibly use this issue to break encryption. This issue only
applied to Ubuntu 15.10. (CVE-2015-3193)

Loïc Jonas Etienne discovered that OpenSSL incorrectly handled ASN.1
signatures with a missing PSS parameter. A remote attacker could possibly
use this issue to cause OpenSSL to crash, resulting in a denial of service.
(CVE-2015-3194)

Adam Langley discovered that OpenSSL incorrectly handled malformed
X509_ATTRIBUTE structures. A remote attacker could possibly use this issue
to cause OpenSSL to consume resources, resulting in a denial of service.
(CVE-2015-3195)

It was discovered that OpenSSL incorrectly handled PSK identity hints. A
remote attacker could possibly use this issue to cause OpenSSL to crash,
resulting in a denial of service. This issue only applied to Ubuntu 12.04
LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-3196)

Update instructions:

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

Ubuntu 15.10:
  libssl1.0.0                     1.0.2d-0ubuntu1.2

Ubuntu 15.04:
  libssl1.0.0                     1.0.1f-1ubuntu11.5

Ubuntu 14.04 LTS:
  libssl1.0.0                     1.0.1f-1ubuntu2.16

Ubuntu 12.04 LTS:
  libssl1.0.0                     1.0.1-4ubuntu5.32

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

References:
  https://ubuntu.com/security/notices/USN-2830-1
  CVE-2015-1794, CVE-2015-3193, CVE-2015-3194, CVE-2015-3195,
  CVE-2015-3196

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/1.0.2d-0ubuntu1.2
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu11.5
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.16
  https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.32