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[SECURITY] [DLA 2016-1] ssvnc security update

Package        : ssvnc
Version        : 1.0.29-2+deb8u1
CVE ID         : CVE-2018-20020 CVE-2018-20021 CVE-2018-20022 CVE-2018-20024
Debian Bug     : 945827

Several vulnerabilities have been identified in the VNC code of ssvnc, an
encryption-capable VNC client..

The vulnerabilities referenced below are issues that have originally been
reported against Debian source package libvncserver (which also ships the
libvncclient shared library). The ssvnc source package in Debian ships a
custom-patched, stripped down and outdated variant of libvncclient, thus
some of libvncclient's security fixes required porting over.


    LibVNC contained heap out-of-bound write vulnerability inside
    structure in VNC client code that can result remote code execution


    LibVNC contained a CWE-835: Infinite loop vulnerability in VNC client
    code. Vulnerability allows attacker to consume excessive amount of
    resources like CPU and RAM


    LibVNC contained multiple weaknesses CWE-665: Improper Initialization
    vulnerability in VNC client code that allowed attackers to read stack
    memory and could be abused for information disclosure. Combined with
    another vulnerability, it could be used to leak stack memory layout
    and in bypassing ASLR.


    LibVNC contained null pointer dereference in VNC client code that
    could result DoS.

For Debian 8 "Jessie", these problems have been fixed in version

We recommend that you upgrade your ssvnc 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


mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148

GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22  0782 9AF4 6B30 2577 1B31
mail: sunweaver@debian.org, http://sunweavers.net

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