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RHEL 6 : openssh (RHSA-2017:2563)

medium Nessus Plugin ID 102909

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Synopsis

The remote Red Hat host is missing a security update for openssh.

Description

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2017:2563 advisory.

 OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.

 Security Fix(es):

 * A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users.
 A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses. (CVE-2016-6210)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL openssh package based on the guidance in RHSA-2017:2563.

See Also

http://www.nessus.org/u?1e8ff72b

https://access.redhat.com/errata/RHSA-2017:2563

https://access.redhat.com/security/updates/classification/#moderate

https://bugzilla.redhat.com/show_bug.cgi?id=1357442

Plugin Details

Severity: Medium

ID: 102909

File Name: redhat-RHSA-2017-2563.nasl

Version: 3.9

Type: local

Agent: unix

Published: 9/1/2017

Updated: 11/5/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.4

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

CVSS Score Source: CVE-2016-6210

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.3

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:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:openssh-askpass, p-cpe:/a:redhat:enterprise_linux:openssh, p-cpe:/a:redhat:enterprise_linux:openssh-server, p-cpe:/a:redhat:enterprise_linux:openssh-ldap, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:pam_ssh_agent_auth, p-cpe:/a:redhat:enterprise_linux:openssh-clients

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/31/2017

Vulnerability Publication Date: 2/13/2017

Reference Information

CVE: CVE-2016-6210

CWE: 385

RHSA: 2017:2563