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Ubuntu 14.04 LTS USN-2365-1 Critical: LibVNCServer Denial Of Service

ubuntu
Calendar Grey September 29, 2014
Scroller Ubuntu
Multiple vulnerabilities in LibVNCServer addressed in recent Ubuntu updates; imperative to upgrade systems to mitigate potential threats.
Several security issues were fixed in LibVNCServer.

Summary

Several security issues were fixed in LibVNCServer.

Software Description:

- libvncserver: vnc server library

Details:

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...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu libvncserver

Update Instructions

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

Ubuntu 14.04 LTS:
  libvncserver0                   0.9.9+dfsg-1ubuntu1.1

Ubuntu 12.04 LTS:
  libvncserver0                   0.9.8.2-2ubuntu1.1

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

References

https://ubuntu.com/security/notices/USN-2365-1

CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054,

CVE-2014-6055

Severity
critical
Lowest
Low
Medium
High
Critical

September 29, 2014

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu libvncserver

Package Information

https://launchpad.net/ubuntu/+source/libvncserver/0.9.9+dfsg-1ubuntu1.1
https://launchpad.net/ubuntu/+source/libvncserver/0.9.8.2-2ubuntu1.1

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