Executive Summary

Summary
Title libssh2 security update
Informations
Name RHSA-2016:0428 First vendor Publication 2016-03-10
Vendor RedHat Last vendor Modification 2016-03-10
Severity (Vendor) N/A Revision 01

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:M/Au:N/C:P/I:N/A:N)
Cvss Base Score 4.3 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

Updated libssh2 packages that fix one security issue are now available for Red Hat Enterprise Linux 6 and 7.

Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64

3. Description:

The libssh2 packages provide a library that implements the SSHv2 protocol.

A type confusion issue was found in the way libssh2 generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters. (CVE-2016-0787)

Red Hat would like to thank Aris Adamantiadis for reporting this issue.

All libssh2 users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing these updated packages, all running applications using libssh2 must be restarted for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1306021 - CVE-2016-0787 libssh2: bits/bytes confusion resulting in truncated Diffie-Hellman secret length

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2016-0428.html

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-200 Information Exposure

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Os 2
Os 2
Os 1

Nessus® Vulnerability Scanner

Date Description
2017-05-01 Name : The remote EulerOS host is missing a security update.
File : EulerOS_SA-2016-1005.nasl - Type : ACT_GATHER_INFO
2016-08-12 Name : The remote device is missing a vendor-supplied security patch.
File : f5_bigip_SOL21531693.nasl - Type : ACT_GATHER_INFO
2016-07-26 Name : An application installed on the remote host is affected by multiple vulnerabi...
File : securitycenter_5_4.nasl - Type : ACT_GATHER_INFO
2016-06-27 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201606-12.nasl - Type : ACT_GATHER_INFO
2016-04-07 Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2016-683.nasl - Type : ACT_GATHER_INFO
2016-03-25 Name : The remote openSUSE host is missing a security update.
File : openSUSE-2016-388.nasl - Type : ACT_GATHER_INFO
2016-03-14 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-0723-1.nasl - Type : ACT_GATHER_INFO
2016-03-14 Name : The remote SUSE host is missing one or more security updates.
File : suse_SU-2016-0718-1.nasl - Type : ACT_GATHER_INFO
2016-03-11 Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20160310_libssh2_on_SL6_x.nasl - Type : ACT_GATHER_INFO
2016-03-11 Name : The remote OracleVM host is missing a security update.
File : oraclevm_OVMSA-2016-0035.nasl - Type : ACT_GATHER_INFO
2016-03-11 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2016-0428.nasl - Type : ACT_GATHER_INFO
2016-03-11 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2016-0428.nasl - Type : ACT_GATHER_INFO
2016-03-10 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2016-0428.nasl - Type : ACT_GATHER_INFO
2016-03-10 Name : The remote Fedora host is missing a security update.
File : fedora_2016-7942ee2cc5.nasl - Type : ACT_GATHER_INFO
2016-03-04 Name : The remote openSUSE host is missing a security update.
File : openSUSE-2016-295.nasl - Type : ACT_GATHER_INFO
2016-03-04 Name : The remote Fedora host is missing a security update.
File : fedora_2016-215a2219b1.nasl - Type : ACT_GATHER_INFO
2016-02-24 Name : The remote Debian host is missing a security update.
File : debian_DLA-426.nasl - Type : ACT_GATHER_INFO
2016-02-24 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-3487.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2016-04-18 21:29:51
  • Multiple Updates
2016-04-13 21:29:27
  • Multiple Updates
2016-03-12 13:27:24
  • Multiple Updates
2016-03-11 13:26:30
  • Multiple Updates
2016-03-10 09:29:03
  • Multiple Updates
2016-03-10 09:24:05
  • First insertion