SUSE SLES11 Security Update : kvm (SUSE-SU-2018:1479-1) (Spectre)

Medium Nessus Plugin ID 110261

Synopsis

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

Description

This update for kvm fixes one security issues. This security issue was fixed :

- CVE-2018-3639: Spectre v4 vulnerability mitigation support for KVM guests (bsc#1092885). Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis. This patch permits the new x86 cpu feature flag named 'ssbd' to be presented to the guest, given that the host has this feature, and KVM exposes it to the guest as well.
For this feature to be enabled please use the qemu commandline

-cpu $MODEL,+spec-ctrl,+ssbd so the guest OS can take advantage of the feature. spec-ctrl and ssbd support is also required in the host.

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 the SUSE recommended installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server 11-SP4:zypper in -t patch slessp4-kvm-13634=1

See Also

https://bugzilla.suse.com/show_bug.cgi?id=1092885

https://www.suse.com/security/cve/CVE-2018-3639/

http://www.nessus.org/u?e8377233

Plugin Details

Severity: Medium

ID: 110261

File Name: suse_SU-2018-1479-1.nasl

Version: 1.6

Type: local

Agent: unix

Published: 2018/05/31

Updated: 2019/09/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.9

Temporal Score: 3.8

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:N

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

Base Score: 5.5

Temporal Score: 5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:kvm, cpe:/o:novell:suse_linux:11

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2018/05/30

Vulnerability Publication Date: 2018/05/22

Reference Information

CVE: CVE-2018-3639