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AUSCERT External Security Bulletin Redistribution
ESB-2018.1027
LibVNCServer vulnerability
5 April 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: libvncclient1
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-7225
Reference: ESB-2018.0947
ESB-2018.0883
Original Bulletin:
http://www.ubuntu.com/usn/usn-3618-1
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Ubuntu Security Notice USN-3618-1
April 04, 2018
libvncserver vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 17.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS
Summary:
LibVNCServer could be made to crash, expose sensitive information, or run
programs if it received specially crafted network traffic.
Software Description:
- - libvncserver: vnc server library
Details:
It was discovered that LibVNCServer incorrectly handled certain packet
lengths. A remote attacker able to connect to a LibVNCServer could possibly
use this issue to obtain sensitive information, cause a denial of service,
or execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.10:
libvncclient1 0.9.11+dfsg-1ubuntu0.1
libvncserver1 0.9.11+dfsg-1ubuntu0.1
Ubuntu 16.04 LTS:
libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.2
Ubuntu 14.04 LTS:
libvncserver0 0.9.9+dfsg-1ubuntu1.3
After a standard system update you need to restart LibVNCServer
applications to make all the necessary changes.
References:
https://usn.ubuntu.com/usn/usn-3618-1
CVE-2018-7225
Package Information:
https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.2
https://launchpad.net/ubuntu/+source/libvncserver/0.9.9+dfsg-1ubuntu1.3
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