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Ubuntu Security Notice USN-3512-1
December 11, 2017

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

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

– Ubuntu 17.10
– Ubuntu 17.04
– Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

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

Details:

David Benjamin discovered that OpenSSL did not correctly prevent
buggy applications that ignore handshake errors from subsequently calling
certain functions. (CVE-2017-3737)

It was discovered that OpenSSL incorrectly performed the x86_64 Montgomery
multiplication procedure. While unlikely, a remote attacker could possibly
use this issue to recover private keys. (CVE-2017-3738)

Update instructions:

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

Ubuntu 17.10:
libssl1.0.0 1.0.2g-1ubuntu13.3

Ubuntu 17.04:
libssl1.0.0 1.0.2g-1ubuntu11.4

Ubuntu 16.04 LTS:
libssl1.0.0 1.0.2g-1ubuntu4.10

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

References:
https://www.ubuntu.com/usn/usn-3512-1
CVE-2017-3737, CVE-2017-3738

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu13.3
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu11.4
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.10

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