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Sicherheit: Zwei Probleme in OpenSSH
Aktuelle Meldungen Distributionen
Name: Zwei Probleme in OpenSSH
ID: USN-3061-1
Distribution: Ubuntu
Plattformen: Ubuntu 12.04 LTS, Ubuntu 14.04 LTS, Ubuntu 16.04 LTS
Datum: Mo, 15. August 2016, 19:34
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6515
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6210

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From: Marc Deslauriers <marc.deslauriers@canonical.com>
Reply-To: Ubuntu Security <security@ubuntu.com>
To: ubuntu-security-announce@lists.ubuntu.com
Message-ID: <26871884-db7c-630b-df37-dfd28e120c40@canonical.com>
Subject: [USN-3061-1] OpenSSH vulnerabilities

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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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