ESB-2019.0295 - [Debian] libvncserver: Multiple vulnerabilities 2019-02-01

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0295
           [SECURITY] [DLA 1652-1] libvncserver security update
                              1 February 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libvncserver
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-20750 CVE-2018-20749 CVE-2018-20748
                   CVE-2018-15126  

Reference:         ESB-2019.0123
                   ESB-2019.0114

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html

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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.

CVE-2018-15126

    An attacker can cause denial of service or remote code execution via
    a heap use-after-free issue in the tightvnc-filetransfer extension.

CVE-2018-20748
CVE-2018-20749
CVE-2018-20750

    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
0.9.9+dfsg2-6.1+deb8u5.

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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