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Debian DLA-426-1 : libssh2 security update

medium Nessus Plugin ID 88914

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Synopsis

The remote Debian host is missing a security update.

Description

Andreas Schneider reported that libssh2, an SSH2 protocol implementation used by many applications, did not generate sufficiently long Diffie-Hellman secrets.

This vulnerability could be exploited by an eavesdropper to decrypt and to intercept SSH sessions.

For the oldoldstable distribution (squeeze), this has been fixed in version 1.2.6-1+deb6u2. Although the changelog refers to 'sha256', this version only supports DH SHA-1 key exchange and it is that key exchange method that has been fixed.

For the oldstable (wheezy) and stable (jessie) distributions, this will be fixed soon.

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

Solution

Upgrade the affected packages.

See Also

https://lists.debian.org/debian-lts-announce/2016/02/msg00018.html

https://packages.debian.org/source/squeeze-lts/libssh2

Plugin Details

Severity: Medium

ID: 88914

File Name: debian_DLA-426.nasl

Version: 2.10

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

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:debian:debian_linux:libssh2-1-dev, p-cpe:/a:debian:debian_linux:libssh2-1-dbg, cpe:/o:debian:debian_linux:6.0, p-cpe:/a:debian:debian_linux:libssh2-1

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/23/2016

Reference Information

CVE: CVE-2016-0787