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AUSCERT External Security Bulletin Redistribution
[SECURITY] [DLA 1652-1] libvncserver security update
1 February 2019
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-20750 CVE-2018-20749 CVE-2018-20748
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Package : libvncserver
Version : 0.9.9+dfsg2-6.1+deb8u5
CVE ID : CVE-2018-15126 CVE-2018-20748 CVE-2018-20749 CVE-2018-20750
A vulnerability was found by Kaspersky Lab in libvncserver, a C library
to implement VNC server/client functionalities. In addition, some of the
vulnerabilities addressed in DLA 1617-1 were found to have incomplete
fixes, and have been addressed in this update.
An attacker can cause denial of service or remote code execution via
a heap use-after-free issue in the tightvnc-filetransfer extension.
Some of the out of bound heap write fixes for CVE-2018-20019 and
CVE-2018-15127 were incomplete. These CVEs address those issues.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your libvncserver packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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