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AUSCERT External Security Bulletin Redistribution
ESB-2019.0009
[DLA 1617-1] libvncserver security update
2 January 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
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-20024 CVE-2018-20023 CVE-2018-20022
CVE-2018-20021 CVE-2018-20020 CVE-2018-20019
CVE-2018-15127 CVE-2018-6307
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Package : libvncserver
Version : 0.9.9+dfsg2-6.1+deb8u4
CVE ID : CVE-2018-6307 CVE-2018-15127 CVE-2018-20019
CVE-2018-20020 CVE-2018-20021 CVE-2018-20022
CVE-2018-20023 CVE-2018-20024
Debian Bug : 916941
Kaspersky Lab discovered several vulnerabilities in libvncserver, a C
library to implement VNC server/client functionalities.
CVE-2018-6307
a heap use-after-free vulnerability in the server code of the file
transfer extension, which can result in remote code execution. This
attack appears to be exploitable via network connectivity.
CVE-2018-15127
contains a heap out-of-bound write vulnerability in the server code
of the file transfer extension, which can result in remote code
execution. This attack appears to be exploitable via network
connectivity.
CVE-2018-20019
multiple heap out-of-bound write vulnerabilities in VNC client code,
which can result in remote code execution.
CVE-2018-20020
heap out-of-bound write vulnerability in a structure in VNC client
code, which can result in remote code execution.
CVE-2018-20021
CWE-835: Infinite Loop vulnerability in VNC client code. The
vulnerability could allow an attacker to consume an excessive amount
of resources, such as CPU and RAM.
CVE-2018-20022
CWE-665: Improper Initialization weaknesses in VNC client code,
which could allow an attacker to read stack memory and can be abused
for information disclosure. Combined with another vulnerability, it
can be used to leak stack memory layout and bypass ASLR.
CVE-2018-20023
Improper Initialization vulnerability in VNC Repeater client code,
which could allow an attacker to read stack memory and can be abused
for information disclosure. Combined with another vulnerability, it
can be used to leak stack memory layout and bypass ASLR.
CVE-2018-20024
a null pointer dereference in VNC client code, which can result in
DoS.
For Debian 8 "Jessie", these problems have been fixed in version
0.9.9+dfsg2-6.1+deb8u4.
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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