SUSE SLED12 / SLES12 Security Update : openvpn (SUSE-SU-2017:1635-1)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote SUSE host is missing one or more security updates.

Description :

This update for openvpn fixes the following issues :

- Some parts of the certificate-parsing code did not
always clear all allocated memory. This would have
allowed clients to leak a few bytes of memory for each
connection attempt, thereby facilitating a (quite
inefficient) DoS attack on the server. [bsc#1044947,
CVE-2017-7521]

- The ASN1 parsing code contained a bug that could have
resulted in some buffers being free()d twice, and this
issue could have potentially been triggered remotely by
a VPN peer. [bsc#1044947, CVE-2017-7521]

- If clients used a HTTP proxy with NTLM authentication, a
man-in-the-middle attacker between client and proxy
could cause the client to crash or disclose at most 96
bytes of stack memory. The disclosed stack memory was
likely to contain the proxy password. If the proxy
password had not been reused, this was unlikely to
compromise the security of the OpenVPN tunnel itself.
Clients who did not use the

--http-proxy option with ntlm2 authentication were not
affected. [bsc#1044947, CVE-2017-7520]

- It was possible to trigger an assertion by sending a
malformed IPv6 packet. That issue could have been abused
to remotely shutdown an openvpn server or client, if
IPv6 and --mssfix were enabled and if the IPv6 networks
used inside the VPN were known. [bsc#1044947,
CVE-2017-7508]

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

See also :

https://bugzilla.suse.com/1044947
https://www.suse.com/security/cve/CVE-2017-7508.html
https://www.suse.com/security/cve/CVE-2017-7520.html
https://www.suse.com/security/cve/CVE-2017-7521.html
http://www.nessus.org/u?d1032a2e

Solution :

To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE OpenStack Cloud 6:zypper in -t patch
SUSE-OpenStack-Cloud-6-2017-1011=1

SUSE Linux Enterprise Server for SAP 12-SP1:zypper in -t patch
SUSE-SLE-SAP-12-SP1-2017-1011=1

SUSE Linux Enterprise Server for SAP 12:zypper in -t patch
SUSE-SLE-SAP-12-2017-1011=1

SUSE Linux Enterprise Server for Raspberry Pi 12-SP2:zypper in -t
patch SUSE-SLE-RPI-12-SP2-2017-1011=1

SUSE Linux Enterprise Server 12-SP2:zypper in -t patch
SUSE-SLE-SERVER-12-SP2-2017-1011=1

SUSE Linux Enterprise Server 12-SP1-LTSS:zypper in -t patch
SUSE-SLE-SERVER-12-SP1-2017-1011=1

SUSE Linux Enterprise Server 12-LTSS:zypper in -t patch
SUSE-SLE-SERVER-12-2017-1011=1

SUSE Linux Enterprise Desktop 12-SP2:zypper in -t patch
SUSE-SLE-DESKTOP-12-SP2-2017-1011=1

To bring your system up-to-date, use 'zypper patch'.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 3.7
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: SuSE Local Security Checks

Nessus Plugin ID: 100985 ()

Bugtraq ID:

CVE ID: CVE-2017-7508
CVE-2017-7520
CVE-2017-7521

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