USN-3061-1: OpenSSH vulnerabilities

Releases

• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• 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

• openssh-server - 1:7.2p2-4ubuntu2.1

Ubuntu 14.04

• openssh-server - 1:6.6p1-2ubuntu2.8

Ubuntu 12.04

• openssh-server - 1:5.9p1-5ubuntu1.10

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

References

• CVE-2016-6210
• CVE-2016-6515