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Ubuntu Security Notice USN-3061-1
August 15, 2016

openssh vulnerabilities
==========================================================================

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

– Ubuntu 16.04 LTS
– Ubuntu 14.04 LTS
– Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in OpenSSH.

Software Description:
– openssh: secure shell (SSH) for secure access to remote machines

Details:

Eddie Harari discovered that OpenSSH incorrectly handled password hashing
when authenticating non-existing users. A remote attacker could perform a
timing attack and enumerate valid users. (CVE-2016-6210)

Tomas Kuthan, Andres Rojas, and Javier Nieto discovered that OpenSSH did
not limit password lengths. A remote attacker could use this issue to cause
OpenSSH to consume resources, leading to a denial of service.
(CVE-2016-6515)

Update instructions:

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

Ubuntu 16.04 LTS:
openssh-server 1:7.2p2-4ubuntu2.1

Ubuntu 14.04 LTS:
openssh-server 1:6.6p1-2ubuntu2.8

Ubuntu 12.04 LTS:
openssh-server 1:5.9p1-5ubuntu1.10

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-3061-1
CVE-2016-6210, CVE-2016-6515

Package Information:
https://launchpad.net/ubuntu/+source/openssh/1:7.2p2-4ubuntu2.1
https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.8
https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.10

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