[security-announce] SUSE-SU-2017:1635-1: important: Security update for openvpn

news · June 21, 2017

SUSE Security Update: Security update for openvpn

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Announcement ID: SUSE-SU-2017:1635-1

Rating: important

References: #1044947

Cross-References: CVE-2017-7508 CVE-2017-7520 CVE-2017-7521

Affected Products:

SUSE OpenStack Cloud 6

SUSE Linux Enterprise Server for SAP 12-SP1

SUSE Linux Enterprise Server for SAP 12

SUSE Linux Enterprise Server for Raspberry Pi 12-SP2

SUSE Linux Enterprise Server 12-SP2

SUSE Linux Enterprise Server 12-SP1-LTSS

SUSE Linux Enterprise Server 12-LTSS

SUSE Linux Enterprise Desktop 12-SP2

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An update that fixes three vulnerabilities is now available.

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]

Patch Instructions:

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".

Package List:

- SUSE OpenStack Cloud 6 (x86_64):

openvpn-2.3.8-16.17.1

openvpn-auth-pam-plugin-2.3.8-16.17.1

openvpn-auth-pam-plugin-debuginfo-2.3.8-16.17.1

openvpn-debuginfo-2.3.8-16.17.1