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USN-4772-1: VNC4 vulnerabilities

15 March 2021

Several security issues were fixed in VNC4.

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Releases

Packages

  • vnc4 - Virtual network computing

Details

USN-2500-1 addressed CVE-2015-0255 for xorg-server. This update provides
the corresponding fix for VNC4 on Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
(CVE-2015-0255)

USN-2726-1 addressed CVE-2015-1283 for Expat. This update provides the
corresponding fix for VNC4 on Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
(CVE-2015-1283)

Original advisory details:

Olivier Fourdan discovered that the X.Org X server incorrectly handled
XkbSetGeometry requests resulting in an information leak. An attacker able
to connect to an X server, either locally or remotely, could use this issue
to possibly obtain sensitive information. (CVE-2015-0255)

It was discovered that Expat incorrectly handled malformed XML data. If a
user or application linked against Expat were tricked into opening a
crafted XML file, an attacker could cause a denial of service, or possibly
execute arbitrary code. (CVE-2015-1283)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04
Ubuntu 14.04

In general, a standard system update will make all the necessary changes.

References

Related notices

  • USN-2500-1: xserver-xorg-core-udeb, xserver-xorg-xmir, xserver-xorg-core-lts-trusty, xserver-xorg-core-lts-utopic, xserver-xorg-core, xserver-xephyr-lts-utopic, xserver-xorg-dev, xorg-server-lts-trusty, xdmx-tools, xserver-common, xorg-server-lts-utopic, xorg-server-source, xserver-xorg-dev-lts-utopic, xdmx, xnest, xorg-server, xvfb, xwayland-lts-utopic, xserver-xephyr, xorg-server-source-lts-utopic
  • USN-3013-1: libxmlrpc-core-c3, xmlrpc-c, libxmlrpc-c++4
  • USN-2726-1: expat, lib64expat1, libexpat1, libexpat1-dev, lib64expat1-dev, libexpat1-udeb
  • USN-2677-1: oxideqt-codecs-extra, liboxideqt-qmlplugin, oxide-qt, liboxideqtcore0, liboxideqtquick0, oxideqt-codecs, oxideqt-chromedriver, oxideqmlscene
  • USN-5455-1: libxmltok1, libxmltok1-dev, libxmltok

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