RHEL 6 : libvncserver (RHSA-2015:0113)
High Nessus Plugin ID 81143
SynopsisThe remote Red Hat host is missing one or more security updates.
DescriptionUpdated libvncserver packages that fix two security issues are now available for Red Hat Enterprise Linux 6.5 Extended Update Support.
Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.
LibVNCServer is a library that allows for easy creation of VNC server or client functionality.
An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way screen sizes were handled by LibVNCServer. A malicious VNC server could use this flaw to cause a client to crash or, potentially, execute arbitrary code in the client. (CVE-2014-6051)
Two stack-based buffer overflow flaws were found in the way LibVNCServer handled file transfers. A remote attacker could use this flaw to crash the VNC server using a malicious VNC client.
Red Hat would like to thank oCERT for reporting these issues. oCERT acknowledges Nicolas Ruff as the original reporter.
All libvncserver users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.
All running applications linked against libvncserver must be restarted for this update to take effect.
SolutionUpdate the affected libvncserver, libvncserver-debuginfo and / or libvncserver-devel packages.