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Debian DSA-3487-1 : libssh2 - security update

medium Nessus Plugin ID 88915

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Synopsis

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

Description

Andreas Schneider reported that libssh2, a SSH2 client-side library, passes the number of bytes to a function that expects number of bits during the SSHv2 handshake when libssh2 is to get a suitable value for'group order' in the Diffie-Hellman negotiation. This weakens significantly the handshake security, potentially allowing an eavesdropper with enough resources to decrypt or intercept SSH sessions.

Solution

Upgrade the libssh2 packages.

For the oldstable distribution (wheezy), this problem has been fixed in version 1.4.2-1.1+deb7u2.

For the stable distribution (jessie), this problem has been fixed in version 1.4.3-4.1+deb8u1.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=815662

https://packages.debian.org/source/wheezy/libssh2

https://packages.debian.org/source/jessie/libssh2

https://www.debian.org/security/2016/dsa-3487

Plugin Details

Severity: Medium

ID: 88915

File Name: debian_DSA-3487.nasl

Version: 2.6

Type: local

Agent: unix

Published: 2/24/2016

Updated: 1/11/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, 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: p-cpe:/a:debian:debian_linux:libssh2, cpe:/o:debian:debian_linux:7.0, cpe:/o:debian:debian_linux:8.0

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

Patch Publication Date: 2/23/2016

Reference Information

CVE: CVE-2016-0787

DSA: 3487