=========================================================================Ubuntu Security Notice USN-2365-1
September 29, 2014
libvncserver vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
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 could use this issue to cause a
server to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2014-6055)
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
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
