[USN-3061-1] OpenSSH vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Mon Aug 15 17:26:34 UTC 2016

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


Several security issues were fixed in OpenSSH.

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


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.

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.

  CVE-2016-6210, CVE-2016-6515

Package Information:

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