Moderate CentOS libvncserver Security Update
|libvncserver-0.9.7-7.el6_6.1.i686.rpm, libvncserver-0.9.7-7.el6_6.1.src.rpm, libvncserver-0.9.7-7.el6_6.1.x86_64.rpm, libvncserver-0.9.9-9.el7_0.1.i686.rpm, libvncserver-0.9.9-9.el7_0.1.src.rpm, libvncserver-0.9.9-9.el7_0.1.x86_64.rpm, libvncserver-devel-0.9.7-7.el6_6.1.i686.rpm, libvncserver-devel-0.9.7-7.el6_6.1.x86_64.rpm, libvncserver-devel-0.9.9-9.el7_0.1.i686.rpm, libvncserver-devel-0.9.9-9.el7_0.1.x86_64.rpm|
|rhn.redhat.com, lists.centos.org, lists.centos.org|
Updated libvncserver packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 6 and 7.
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
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)
A NULL pointer dereference flaw was found in LibVNCServer's framebuffer
setup. A malicious VNC server could use this flaw to cause a VNC client to
A NULL pointer dereference flaw was found in the way LibVNCServer handled
certain ClientCutText message. A remote attacker could use this flaw to
crash the VNC server by sending a specially crafted ClientCutText message
from a VNC client. (CVE-2014-6053)
A divide-by-zero flaw was found in the way LibVNCServer handled the scaling
factor when it was set to "0". A remote attacker could use this flaw to
crash the VNC server using a malicious VNC client. (CVE-2014-6054)
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. (CVE-2014-6055)
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.
Please see https://www.redhat.com/footer/terms-of-use.html
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The constraints below list the versions that this vulnerability is patched in, and versions that are unaffected. If a patch is ready but unrealeased, then it is pending.
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Affected package information