Advisory Published

USN-2365-1: LibVNCServer vulnerabilities

First published: Mon Sep 29 2014(Updated: )

Nicolas Ruff discovered that LibVNCServer incorrectly handled memory when being advertised large screen sizes by the server. If a user were tricked into connecting to a malicious server, an attacker could use this issue to cause a denial of service, or possibly execute arbitrary code. (CVE-2014-6051, CVE-2014-6052) Nicolas Ruff discovered that LibVNCServer incorrectly handled large ClientCutText messages. A remote attacker could use this issue to cause a server to crash, resulting in a denial of service. (CVE-2014-6053) Nicolas Ruff discovered that LibVNCServer incorrectly handled zero scaling factor values. A remote attacker could use this issue to cause a server to crash, resulting in a denial of service. (CVE-2014-6054) Nicolas Ruff discovered that LibVNCServer incorrectly handled memory in the file transfer feature. A remote attacker could use this issue to cause a server to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2014-6055)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libvncserver0<0.9.9+dfsg-1ubuntu1.1
0.9.9+dfsg-1ubuntu1.1
=14.04
All of
ubuntu/libvncserver0<0.9.8.2-2ubuntu1.1
0.9.8.2-2ubuntu1.1
=12.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this advisory?

    The vulnerability ID for this advisory is CVE-2014-6051.

  • How does the LibVNCServer vulnerability affect users?

    If a user connects to a malicious server, an attacker could cause a denial of service or execute arbitrary code.

  • Which version of LibVNCServer is affected by this vulnerability?

    LibVNCServer versions 0.9.9+dfsg-1ubuntu1.1 and 0.9.8.2-2ubuntu1.1 are affected by this vulnerability.

  • What is the remedy for this vulnerability?

    The remedy for this vulnerability is to upgrade to version 0.9.9+dfsg-1ubuntu1.1 for Ubuntu 14.04 and version 0.9.8.2-2ubuntu1.1 for Ubuntu 12.04.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability at the following references: [link1](https://ubuntu.com/security/CVE-2014-6051), [link2](https://ubuntu.com/security/CVE-2014-6052), [link3](https://ubuntu.com/security/CVE-2014-6053).

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