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AUSCERT External Security Bulletin Redistribution
ESB-2014.1783
USN-2365-1: LibVNCServer vulnerabilities
7 October 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: libvncserver
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2014-6055 CVE-2014-6054 CVE-2014-6053
CVE-2014-6052 CVE-2014-6051
Original Bulletin:
http://www.ubuntu.com/usn/USN-2365-1/
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
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
version:
Ubuntu 14.04 LTS:
libvncserver0 0.9.9+dfsg-1ubuntu1.1
Ubuntu 12.04 LTS:
libvncserver0 0.9.8.2-2ubuntu1.1
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.
References
CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055
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