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Debian LTS Advisory ([SECURITY] [DLA 831-1] gtk-vnc security update)

Information

Severity

Severity

High

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

7.5

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

4 years ago

Modified

Modified

3 years ago

Summary

Josef Gajdusek discovered two vulnerabilities in gtk-vnc, a VNC viewer widget for GTK: CVE-2017-5884 Fix bounds checking for RRE, hextile & copyrec encodings. This bug allowed a remote server to cause a denial of service by buffer overflow via a carefully crafted message containing subrectangles outside the drawing area. CVE-2017-5885 Correctly validate color map range indexes. This bug allowed a remote server to cause a denial of service by buffer overflow via a carefully crafted message with out-of-range colour values.

Affected Software

Affected Software

gtk-vnc on Debian Linux

Detection Method

Detection Method

This check tests the installed software version using the apt package manager.

Solution

Solution

For Debian 7 'Wheezy', these problems have been fixed in version 0.5.0-3.1+deb7u1. We recommend that you upgrade your gtk-vnc packages.

Common Vulnerabilities and Exposures (CVE)

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1. Download Multipass

sudo snap install multipass

2. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

3. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash

1. If you don’t have it already, install Brew. Then, to install Multipass simply execute:

brew install --cask multipass

2. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

2. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash

1. Download the installer for Windows

Note: You need Windows 10 Pro/Enterprise/Education v 1803 or later, or any Windows 10 with VirtualBox

2. Ensure your network is private

Make sure your local network is designated as private, otherwise Windows prevents Multipass from starting.

3. Run the installer

You need to allow the installer to gain Administrator privileges.

4. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04

5. Log into the multipass instance

multipass shell mageni

6. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash