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GLSA-201606-12 : libssh and libssh2: Multiple vulnerabilities

medium Nessus Plugin ID 91843

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Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-201606-12 (libssh and libssh2: Multiple vulnerabilities)

 libssh and libssh2 both have a bits/bytes confusion bug and generate an abnormaly 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.
 Additionally, a double free on dangling pointers in initial key exchange packets within libssh could leave dangling pointers in the session crypto structures. It is possible to send a malicious kexinit package to eventually cause a server to do a double-free before this fix. This could be used for a Denial of Service attack.
 Impact :

 Remote attackers may gain access to confidential information due to the short keysize generated by libssh and libssh2, or cause a Denial of Service condition.
 Workaround :

 There is no known workaround at this time.

Solution

All libssh users should upgrade to the latest version:
 # emerge --sync # emerge --ask --oneshot --verbose '>=net-libs/libssh-0.7.3' All libssh2 users should upgrade to the latest version:
 # emerge --sync # emerge --ask --oneshot --verbose '>=net-libs/libssh2-1.7.0'

See Also

https://security.gentoo.org/glsa/201606-12

Plugin Details

Severity: Medium

ID: 91843

File Name: gentoo_GLSA-201606-12.nasl

Version: 2.3

Type: local

Published: 6/27/2016

Updated: 1/11/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

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

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:gentoo:linux:libssh, p-cpe:/a:gentoo:linux:libssh2, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Patch Publication Date: 6/26/2016

Reference Information

CVE: CVE-2014-8132, CVE-2016-0739, CVE-2016-0787

GLSA: 201606-12