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Fedora 23 : libssh2-1.6.0-4.fc23 (2016-215a2219b1)

medium Nessus Plugin ID 89491

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Synopsis

The remote Fedora host is missing a security update.

Description

During the SSHv2 handshake when libssh2 is to get a suitable value for 'group order' in the Diffle Hellman negotiation, it would pass in number of bytes to a function that expected number of bits. This would result in the library generating numbers using only an 8th the number of random bits than what were intended: 128 or 256 bits instead of 1023 or 2047 Using such drastically reduced amount of random bits for Diffie Hellman weakened the handshake security significantly. The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2016-0787 to this issue.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected libssh2 package.

See Also

https://bugzilla.redhat.com/show_bug.cgi?id=1306021

http://www.nessus.org/u?08d11e0e

Plugin Details

Severity: Medium

ID: 89491

File Name: fedora_2016-215a2219b1.nasl

Version: 1.5

Type: local

Agent: unix

Published: 3/4/2016

Updated: 1/11/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

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

CVSS v3

Risk Factor: Medium

Base Score: 5.9

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

Vulnerability Information

CPE: cpe:/o:fedoraproject:fedora:23, p-cpe:/a:fedoraproject:fedora:libssh2

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

Patch Publication Date: 2/26/2016

Reference Information

CVE: CVE-2016-0787