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

This script is Copyright (C) 2016 Tenable Network Security, Inc.


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.

See also :

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

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'

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)

Family: Gentoo Local Security Checks

Nessus Plugin ID: 91843 ()

Bugtraq ID:

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

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