Security update for openvpn

Announcement ID:	SUSE-SU-2017:1635-1
Rating:	important
References:	bsc#1044947
Cross-References:	CVE-2017-7508 CVE-2017-7520 CVE-2017-7521
CVSS scores:	CVE-2017-7508 ( SUSE ): 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2017-7508 ( NVD ): 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2017-7520 ( SUSE ): 8.2 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVE-2017-7520 ( NVD ): 7.4 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H CVE-2017-7521 ( SUSE ): 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2017-7521 ( NVD ): 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products:	SUSE Linux Enterprise Desktop 12 SP2 SUSE Linux Enterprise High Performance Computing 12 SP2 SUSE Linux Enterprise Server 12 SUSE Linux Enterprise Server 12 LTSS 12 SUSE Linux Enterprise Server 12 SP1 SUSE Linux Enterprise Server 12 SP1 LTSS 12-SP1 SUSE Linux Enterprise Server 12 SP2 SUSE Linux Enterprise Server for SAP Applications 12 SUSE Linux Enterprise Server for SAP Applications 12 SP1 SUSE Linux Enterprise Server for SAP Applications 12 SP2 SUSE Linux Enterprise Server for the Raspberry Pi 12-SP2 SUSE OpenStack Cloud 6

An update that solves three vulnerabilities can now be installed.

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 update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
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 Desktop 12 SP2
  zypper in -t patch SUSE-SLE-DESKTOP-12-SP2-2017-1011=1
• SUSE Linux Enterprise Server for the Raspberry Pi 12-SP2
  zypper in -t patch SUSE-SLE-RPI-12-SP2-2017-1011=1
• SUSE Linux Enterprise Server for SAP Applications 12 SP1
  zypper in -t patch SUSE-SLE-SAP-12-SP1-2017-1011=1
• SUSE Linux Enterprise Server for SAP Applications 12
  zypper in -t patch SUSE-SLE-SAP-12-2017-1011=1
• SUSE Linux Enterprise Server 12 LTSS 12
  zypper in -t patch SUSE-SLE-SERVER-12-2017-1011=1
• SUSE Linux Enterprise Server 12 SP1 LTSS 12-SP1
  zypper in -t patch SUSE-SLE-SERVER-12-SP1-2017-1011=1
• SUSE Linux Enterprise High Performance Computing 12 SP2
  zypper in -t patch SUSE-SLE-SERVER-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 for SAP Applications 12 SP2
  zypper in -t patch SUSE-SLE-SERVER-12-SP2-2017-1011=1

Package List:

• SUSE OpenStack Cloud 6 (x86_64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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
• SUSE Linux Enterprise Desktop 12 SP2 (x86_64)
  • openvpn-debuginfo-2.3.8-16.17.1
  • openvpn-debugsource-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
• SUSE Linux Enterprise Server for the Raspberry Pi 12-SP2 (aarch64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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
• SUSE Linux Enterprise Server for SAP Applications 12 SP1 (ppc64le x86_64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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
• SUSE Linux Enterprise Server for SAP Applications 12 (x86_64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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
• SUSE Linux Enterprise Server 12 LTSS 12 (ppc64le s390x x86_64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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
• SUSE Linux Enterprise Server 12 SP1 LTSS 12-SP1 (ppc64le s390x x86_64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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
• SUSE Linux Enterprise High Performance Computing 12 SP2 (aarch64 x86_64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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
• SUSE Linux Enterprise Server 12 SP2 (aarch64 ppc64le s390x x86_64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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
• SUSE Linux Enterprise Server for SAP Applications 12 SP2 (ppc64le x86_64)
  • openvpn-auth-pam-plugin-2.3.8-16.17.1
  • openvpn-2.3.8-16.17.1
  • openvpn-debugsource-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

References:

• 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
• https://bugzilla.suse.com/show_bug.cgi?id=1044947