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SUSE SLED12 / SLES12 Security Update : openvpn (SUSE-SU-2017:1635-1)
high Nessus Plugin ID 100985
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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.
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'.
See Also
https://bugzilla.suse.com/show_bug.cgi?id=1044947
https://www.suse.com/security/cve/CVE-2017-7508/
https://www.suse.com/security/cve/CVE-2017-7520/
Plugin Details
Severity: High
ID: 100985
File Name: suse_SU-2017-1635-1.nasl
Version: 3.15
Type: local
Agent: unix
Family: SuSE Local Security Checks
Published: 6/22/2017
Updated: 1/6/2021
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.2
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:novell:suse_linux:12, p-cpe:/a:novell:suse_linux:openvpn-debugsource, p-cpe:/a:novell:suse_linux:openvpn-debuginfo, p-cpe:/a:novell:suse_linux:openvpn-auth-pam-plugin-debuginfo, p-cpe:/a:novell:suse_linux:openvpn-auth-pam-plugin, p-cpe:/a:novell:suse_linux:openvpn
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 6/21/2017
Vulnerability Publication Date: 6/27/2017