openSUSE Security Update : openvpn (openSUSE-2017-730)

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


Synopsis :

The remote openSUSE host is missing a security update.

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]

This update was imported from the SUSE:SLE-12:Update update project.

See also :

https://bugzilla.opensuse.org/show_bug.cgi?id=1044947

Solution :

Update the affected openvpn packages.

Risk factor :

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

Family: SuSE Local Security Checks

Nessus Plugin ID: 101131 ()

Bugtraq ID:

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

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