SUSE SLES12 Security Update : LibVNCServer (SUSE-SU-2018:0830-1)

critical Nessus Plugin ID 108685

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New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

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

Description

LibVNCServer was updated to fix two security issues. These security issues were fixed :

- CVE-2018-7225: Missing input sanitization inside rfbserver.c rfbProcessClientNormalMessage() (bsc#1081493).

- CVE-2016-9942: Heap-based buffer overflow in ultra.c allowed remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions (bsc#1017712).

- CVE-2016-9941: Heap-based buffer overflow in rfbproto.c allowed remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area (bsc#1017711).

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 Software Development Kit 12-SP3:zypper in -t patch SUSE-SLE-SDK-12-SP3-2018-554=1

SUSE Linux Enterprise Software Development Kit 12-SP2:zypper in -t patch SUSE-SLE-SDK-12-SP2-2018-554=1

SUSE Linux Enterprise Server for Raspberry Pi 12-SP2:zypper in -t patch SUSE-SLE-RPI-12-SP2-2018-554=1

SUSE Linux Enterprise Server 12-SP3:zypper in -t patch SUSE-SLE-SERVER-12-SP3-2018-554=1

SUSE Linux Enterprise Server 12-SP2:zypper in -t patch SUSE-SLE-SERVER-12-SP2-2018-554=1

See Also

https://bugzilla.suse.com/show_bug.cgi?id=1017711

https://bugzilla.suse.com/show_bug.cgi?id=1017712

https://bugzilla.suse.com/show_bug.cgi?id=1081493

https://www.suse.com/security/cve/CVE-2016-9941/

https://www.suse.com/security/cve/CVE-2016-9942/

https://www.suse.com/security/cve/CVE-2018-7225/

http://www.nessus.org/u?3b21b199

Plugin Details

Severity: Critical

ID: 108685

File Name: suse_SU-2018-0830-1.nasl

Version: 1.5

Type: local

Agent: unix

Published: 3/28/2018

Updated: 9/10/2019

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:2.3:o:novell:suse_linux:12:*:*:*:*:*:*:*, p-cpe:2.3:a:novell:suse_linux:libvncserver-debugsource:*:*:*:*:*:*:*, p-cpe:2.3:a:novell:suse_linux:libvncclient0:*:*:*:*:*:*:*, p-cpe:2.3:a:novell:suse_linux:libvncclient0-debuginfo:*:*:*:*:*:*:*, p-cpe:2.3:a:novell:suse_linux:libvncserver0:*:*:*:*:*:*:*, p-cpe:2.3:a:novell:suse_linux:libvncserver0-debuginfo:*:*:*:*:*:*:*

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: 3/27/2018

Vulnerability Publication Date: 12/31/2016

Reference Information

CVE: CVE-2016-9941, CVE-2016-9942, CVE-2018-7225