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Debian DSA-3488-1 : libssh - security update

medium Nessus Plugin ID 88916

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Synopsis

The remote Debian host is missing a security-related update.

Description

Aris Adamantiadis discovered that libssh, a tiny C SSH library, incorrectly generated a short ephemeral secret for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods.
The resulting secret is 128 bits long, instead of the recommended sizes of 1024 and 2048 bits respectively. This flaw could allow an eavesdropper with enough resources to decrypt or intercept SSH sessions.

Solution

Upgrade the libssh packages.

For the oldstable distribution (wheezy), this problem has been fixed in version 0.5.4-1+deb7u3. This update also includes fixes for CVE-2014-8132 and CVE-2015-3146, which were previously scheduled for the next wheezy point release.

For the stable distribution (jessie), this problem has been fixed in version 0.6.3-4+deb8u2.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=815663

https://security-tracker.debian.org/tracker/CVE-2014-8132

https://security-tracker.debian.org/tracker/CVE-2015-3146

https://packages.debian.org/source/wheezy/libssh

https://packages.debian.org/source/jessie/libssh

https://www.debian.org/security/2016/dsa-3488

Plugin Details

Severity: Medium

ID: 88916

File Name: debian_DSA-3488.nasl

Version: 2.6

Type: local

Agent: unix

Published: 2/24/2016

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:debian:debian_linux:8.0, p-cpe:/a:debian:debian_linux:libssh, cpe:/o:debian:debian_linux:7.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Patch Publication Date: 2/23/2016

Reference Information

CVE: CVE-2016-0739

DSA: 3488