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Ubuntu Security Notice USN-2959-1
May 03, 2016

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

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

- Ubuntu 16.04 LTS
- Ubuntu 15.10
- 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:

Huzaifa Sidhpurwala, Hanno B=C3=B6ck, and David Benjamin discovered that OpenSSL
incorrectly handled memory when decoding ASN.1 structures. A remote
attacker could use this issue to cause OpenSSL to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2016-2108)

Juraj Somorovsky discovered that OpenSSL incorrectly performed padding when
the connection uses the AES CBC cipher and the server supports AES-NI. A
remote attacker could possibly use this issue to perform a padding oracle
attack and decrypt traffic. (CVE-2016-2107)

Guido Vranken discovered that OpenSSL incorrectly handled large amounts of
input data to the EVP_EncodeUpdate() function. A remote attacker could use
this issue to cause OpenSSL to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2016-2105)

Guido Vranken discovered that OpenSSL incorrectly handled large amounts of
input data to the EVP_EncryptUpdate() function. A remote attacker could use
this issue to cause OpenSSL to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2016-2106)

Brian Carpenter discovered that OpenSSL incorrectly handled memory when
ASN.1 data is read from a BIO. A remote attacker could possibly use this
issue to cause memory consumption, resulting in a denial of service.
(CVE-2016-2109)

As a security improvement, this update also modifies OpenSSL behaviour to
reject DH key sizes below 1024 bits, preventing a possible downgrade
attack.

Update instructions:

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

Ubuntu 16.04 LTS:
  libssl1.0.0                     1.0.2g-1ubuntu4.1

Ubuntu 15.10:
  libssl1.0.0                     1.0.2d-0ubuntu1.5

Ubuntu 14.04 LTS:
  libssl1.0.0                     1.0.1f-1ubuntu2.19

Ubuntu 12.04 LTS:
  libssl1.0.0                     1.0.1-4ubuntu5.36

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

References:
  http://www.ubuntu.com/usn/usn-2959-1
  CVE-2016-2105, CVE-2016-2106, CVE-2016-2107, CVE-2016-2108,
  CVE-2016-2109

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.1
  https://launchpad.net/ubuntu/+source/openssl/1.0.2d-0ubuntu1.5
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.19
  https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.36