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

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