Debian DLA-1617-1 : libvncserver security update

High Nessus Plugin ID 119877

Synopsis

The remote Debian host is missing a security update.

Description

Kaspersky Lab discovered several vulnerabilities in libvncserver, a C library to implement VNC server/client functionalities.

CVE-2018-6307

a heap use-after-free vulnerability in the server code of the file transfer extension, which can result in remote code execution. This attack appears to be exploitable via network connectivity.

CVE-2018-15127

contains a heap out-of-bound write vulnerability in the server code of the file transfer extension, which can result in remote code execution. This attack appears to be exploitable via network connectivity.

CVE-2018-20019

multiple heap out-of-bound write vulnerabilities in VNC client code, which can result in remote code execution.

CVE-2018-20020

heap out-of-bound write vulnerability in a structure in VNC client code, which can result in remote code execution.

CVE-2018-20021

CWE-835: Infinite Loop vulnerability in VNC client code. The vulnerability could allow an attacker to consume an excessive amount of resources, such as CPU and RAM.

CVE-2018-20022

CWE-665: Improper Initialization weaknesses in VNC client code, which could allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and bypass ASLR.

CVE-2018-20023

Improper Initialization vulnerability in VNC Repeater client code, which could allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and bypass ASLR.

CVE-2018-20024

a NULL pointer dereference in VNC client code, which can result in DoS.

For Debian 8 'Jessie', these problems have been fixed in version 0.9.9+dfsg2-6.1+deb8u4.

We recommend that you upgrade your libvncserver packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

See Also

https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html

https://packages.debian.org/source/jessie/libvncserver

Plugin Details

Severity: High

ID: 119877

File Name: debian_DLA-1617.nasl

Version: 1.4

Type: local

Agent: unix

Published: 2018/12/27

Updated: 2019/02/01

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.8

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

CVSS v3.0

Base Score: 9.8

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libvncclient0, p-cpe:/a:debian:debian_linux:libvncclient0-dbg, p-cpe:/a:debian:debian_linux:libvncserver-config, p-cpe:/a:debian:debian_linux:libvncserver-dev, p-cpe:/a:debian:debian_linux:libvncserver0, p-cpe:/a:debian:debian_linux:libvncserver0-dbg, p-cpe:/a:debian:debian_linux:linuxvnc, cpe:/o:debian:debian_linux:8.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Patch Publication Date: 2018/12/26

Vulnerability Publication Date: 2018/12/19

Reference Information

CVE: CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-6307