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Ubuntu Security Notice USN-2639-1
June 11, 2015

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

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

- Ubuntu 15.04
- Ubuntu 14.10
- 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:

Praveen Kariyanahalli, Ivan Fratric and Felix Groebert discovered that
OpenSSL incorrectly handled memory when buffering DTLS data. A remote
attacker could use this issue to cause OpenSSL to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2014-8176)

Joseph Barr-Pixton discovered that OpenSSL incorrectly handled malformed
ECParameters structures. A remote attacker could use this issue to cause
OpenSSL to hang, resulting in a denial of service. (CVE-2015-1788)

Robert Swiecki and Hanno B=C3=B6ck discovered that OpenSSL incorrectly handled
certain ASN1_TIME strings. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service. (CVE-2015-1789)

Michal Zalewski discovered that OpenSSL incorrectly handled missing content
when parsing ASN.1-encoded PKCS#7 blobs. A remote attacker could use this
issue to cause OpenSSL to crash, resulting in a denial of service.
(CVE-2015-1790)

Emilia K=C3=A4sper discovered that OpenSSL incorrectly handled NewSessionTicket
when being used by a multi-threaded client. A remote attacker could use
this issue to cause OpenSSL to crash, resulting in a denial of service.
(CVE-2015-1791)

Johannes Bauer discovered that OpenSSL incorrectly handled verifying
signedData messages using the CMS code. A remote attacker could use this
issue to cause OpenSSL to hang, resulting in a denial of service.
(CVE-2015-1792)

As a security improvement, this update also modifies OpenSSL behaviour to
reject DH key sizes below 768 bits, preventing a possible downgrade
attack.

Update instructions:

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

Ubuntu 15.04:
  libssl1.0.0                     1.0.1f-1ubuntu11.4

Ubuntu 14.10:
  libssl1.0.0                     1.0.1f-1ubuntu9.8

Ubuntu 14.04 LTS:
  libssl1.0.0                     1.0.1f-1ubuntu2.15

Ubuntu 12.04 LTS:
  libssl1.0.0                     1.0.1-4ubuntu5.31

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

References:
  http://www.ubuntu.com/usn/usn-2639-1
  CVE-2014-8176, CVE-2015-1788, CVE-2015-1789, CVE-2015-1790,
  CVE-2015-1791, CVE-2015-1792

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu11.4
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu9.8
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.15
  https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.31