Executive Summary

Summary
Title OpenSSH regression
Informations
Name USN-2710-2 First vendor Publication 2015-08-18
Vendor Ubuntu Last vendor Modification 2015-08-18
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:N/A:C)
Cvss Base Score 8.5 Attack Range Network
Cvss Impact Score 7.8 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 15.04 - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS

Summary:

USN-2710-1 introduced a regression in OpenSSH.

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

Details:

USN-2710-1 fixed vulnerabilities in OpenSSH. The upstream fix for CVE-2015-5600 caused a regression resulting in random authentication failures in non-default configurations. This update fixes the problem.

Original advisory details:

Moritz Jodeit discovered that OpenSSH incorrectly handled usernames when
using PAM authentication. If an additional vulnerability were discovered in
the OpenSSH unprivileged child process, this issue could allow a remote
attacker to perform user impersonation. (CVE number pending)
Moritz Jodeit discovered that OpenSSH incorrectly handled context memory
when using PAM authentication. If an additional vulnerability were
discovered in the OpenSSH unprivileged child process, this issue could
allow a remote attacker to bypass authentication or possibly execute
arbitrary code. (CVE number pending)
Jann Horn discovered that OpenSSH incorrectly handled time windows for
X connections. A remote attacker could use this issue to bypass certain
access restrictions. (CVE-2015-5352)
It was discovered that OpenSSH incorrectly handled keyboard-interactive
authentication. In a non-default configuration, a remote attacker could
possibly use this issue to perform a brute-force password attack.
(CVE-2015-5600)

Update instructions:

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

Ubuntu 15.04:
openssh-server 1:6.7p1-5ubuntu1.3

Ubuntu 14.04 LTS:
openssh-server 1:6.6p1-2ubuntu2.3

Ubuntu 12.04 LTS:
openssh-server 1:5.9p1-5ubuntu1.7

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

References:
http://www.ubuntu.com/usn/usn-2710-2
http://www.ubuntu.com/usn/usn-2710-1
https://launchpad.net/bugs/1485719

Package Information:
https://launchpad.net/ubuntu/+source/openssh/1:6.7p1-5ubuntu1.3
https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.3
https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.7

Original Source

Url : http://www.ubuntu.com/usn/USN-2710-2

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-264 Permissions, Privileges, and Access Controls

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 140

Information Assurance Vulnerability Management (IAVM)

Date Description
2015-08-20 IAVM : 2015-A-0199 - Multiple Vulnerabilities in Apple Mac OS X
Severity : Category I - VMSKEY : V0061337

Snort® IPS/IDS

Date Description
2014-01-10 SSH brute force login attempt
RuleID : 19559 - Revision : 13 - Type : INDICATOR-SCAN

Nessus® Vulnerability Scanner

Date Description
2017-03-07 Name : The remote device is missing a vendor-supplied security patch.
File : f5_bigip_SOL17461.nasl - Type : ACT_GATHER_INFO
2016-05-17 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2016-0741.nasl - Type : ACT_GATHER_INFO
2016-03-22 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2016-0466.nasl - Type : ACT_GATHER_INFO
2016-02-18 Name : The remote device is missing a vendor-supplied security patch.
File : f5_bigip_SOL17113.nasl - Type : ACT_GATHER_INFO
2015-12-02 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2015-2088.nasl - Type : ACT_GATHER_INFO
2015-08-19 Name : The remote Ubuntu host is missing a security-related patch.
File : ubuntu_USN-2710-2.nasl - Type : ACT_GATHER_INFO
2015-07-28 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_5b74a5bc348f11e5ba05c80aa9043978.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
Date Informations
2015-08-21 13:20:37
  • Multiple Updates
2015-08-18 17:28:53
  • First insertion