Oracle Linux 6 / 7 : libssh2 (ELSA-2016-0428)

Medium Nessus Plugin ID 89858


The remote Oracle Linux host is missing one or more security updates.


From Red Hat Security Advisory 2016:0428 :

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.


Update the affected libssh2 packages.

See Also

Plugin Details

Severity: Medium

ID: 89858

File Name: oraclelinux_ELSA-2016-0428.nasl

Version: $Revision: 2.5 $

Type: local

Agent: unix

Published: 2016/03/11

Modified: 2016/12/07

Dependencies: 12634

Risk Information

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C


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:oracle:linux:libssh2, p-cpe:/a:oracle:linux:libssh2-devel, p-cpe:/a:oracle:linux:libssh2-docs, cpe:/o:oracle:linux:6, cpe:/o:oracle:linux:7

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

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/03/10

Reference Information

CVE: CVE-2016-0787

OSVDB: 134850

RHSA: 2016:0428