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AUSCERT External Security Bulletin Redistribution
USN-2365-1: LibVNCServer vulnerabilities
7 October 2014
AusCERT Security Bulletin Summary
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
CVE Names: CVE-2014-6055 CVE-2014-6054 CVE-2014-6053
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running libvncserver check for an updated version of the software
for their operating system.
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USN-2365-1: LibVNCServer vulnerabilities
Ubuntu Security Notice USN-2365-1
29th September, 2014
A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 14.04 LTS
Ubuntu 12.04 LTS
Several security issues were fixed in LibVNCServer.
libvncserver - vnc server library
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.
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)
The problem can be corrected by updating your system to the following package
Ubuntu 14.04 LTS:
Ubuntu 12.04 LTS:
To update your system, please follow these instructions:
In general, a standard system update will make all the necessary changes.
CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055
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