SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2017:0571-1)

critical Nessus Plugin ID 97433

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Synopsis

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

Description

This update for xen fixes several issues. These security issues were fixed :

- CVE-2017-2620: In CIRRUS_BLTMODE_MEMSYSSRC mode the bitblit copy routine cirrus_bitblt_cputovideo failed to check the memory region, allowing for an out-of-bounds write that allows for privilege escalation (bsc#1024834).

- CVE-2017-2615: An error in the bitblt copy operation could have allowed a malicious guest administrator to cause an out of bounds memory access, possibly leading to information disclosure or privilege escalation (bsc#1023004).

- A malicious guest could have, by frequently rebooting over extended periods of time, run the host system out of memory, resulting in a Denial of Service (DoS) (bsc#1022871)

- CVE-2016-9921: The Cirrus CLGD 54xx VGA Emulator support was vulnerable to a divide by zero issue while copying VGA data. A privileged user inside guest could have used this flaw to crash the process instance on the host, resulting in DoS (bsc#1015169

The update package also includes non-security fixes. See advisory for details.

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 Linux Enterprise Software Development Kit 12-SP2:zypper in -t patch SUSE-SLE-SDK-12-SP2-2017-296=1

SUSE Linux Enterprise Server 12-SP2:zypper in -t patch SUSE-SLE-SERVER-12-SP2-2017-296=1

SUSE Linux Enterprise Desktop 12-SP2:zypper in -t patch SUSE-SLE-DESKTOP-12-SP2-2017-296=1

To bring your system up-to-date, use 'zypper patch'.

See Also

https://bugzilla.suse.com/show_bug.cgi?id=1000195

https://bugzilla.suse.com/show_bug.cgi?id=1002496

https://bugzilla.suse.com/show_bug.cgi?id=1005028

https://bugzilla.suse.com/show_bug.cgi?id=1012651

https://bugzilla.suse.com/show_bug.cgi?id=1014298

https://bugzilla.suse.com/show_bug.cgi?id=1014300

https://bugzilla.suse.com/show_bug.cgi?id=1015169

https://bugzilla.suse.com/show_bug.cgi?id=1016340

https://bugzilla.suse.com/show_bug.cgi?id=1022871

https://bugzilla.suse.com/show_bug.cgi?id=1023004

https://bugzilla.suse.com/show_bug.cgi?id=1024834

https://www.suse.com/security/cve/CVE-2016-9921/

https://www.suse.com/security/cve/CVE-2016-9922/

https://www.suse.com/security/cve/CVE-2017-2615/

https://www.suse.com/security/cve/CVE-2017-2620/

http://www.nessus.org/u?565d0656

Plugin Details

Severity: Critical

ID: 97433

File Name: suse_SU-2017-0571-1.nasl

Version: 3.16

Type: local

Agent: unix

Published: 2/28/2017

Updated: 6/3/2021

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 8.6

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:xen, p-cpe:/a:novell:suse_linux:xen-debugsource, p-cpe:/a:novell:suse_linux:xen-doc-html, p-cpe:/a:novell:suse_linux:xen-libs, p-cpe:/a:novell:suse_linux:xen-libs-debuginfo, p-cpe:/a:novell:suse_linux:xen-tools, p-cpe:/a:novell:suse_linux:xen-tools-debuginfo, p-cpe:/a:novell:suse_linux:xen-tools-domU, p-cpe:/a:novell:suse_linux:xen-tools-domU-debuginfo, cpe:/o:novell:suse_linux:12

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: 2/27/2017

Vulnerability Publication Date: 12/23/2016

Reference Information

CVE: CVE-2016-9921, CVE-2016-9922, CVE-2017-2615, CVE-2017-2620

IAVB: 2017-B-0024-S