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RHEL 6 / 7 : libssh2 (RHSA-2016:0428)

medium Nessus Plugin ID 89820

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Synopsis

The remote Red Hat host is missing one or more security updates.

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.

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.

Solution

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2016:0428

https://access.redhat.com/security/cve/cve-2016-0787

Plugin Details

Severity: Medium

ID: 89820

File Name: redhat-RHSA-2016-0428.nasl

Version: 2.13

Type: local

Agent: unix

Published: 3/10/2016

Updated: 10/24/2019

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:libssh2, p-cpe:/a:redhat:enterprise_linux:libssh2-devel, p-cpe:/a:redhat:enterprise_linux:libssh2-docs, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:7.3, cpe:/o:redhat:enterprise_linux:7.4, cpe:/o:redhat:enterprise_linux:7.5, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:6.7, cpe:/o:redhat:enterprise_linux:7.7, cpe:/o:redhat:enterprise_linux:7.2, cpe:/o:redhat:enterprise_linux:7.6, p-cpe:/a:redhat:enterprise_linux:libssh2-debuginfo

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 3/10/2016

Vulnerability Publication Date: 4/13/2016

Reference Information

CVE: CVE-2016-0787

RHSA: 2016:0428