A vulnerability in vzctl might allow attackers to gain control over ploop containers.
|Package||sys-cluster/vzctl on all architectures|
|Affected versions||< 4.9.4|
|Unaffected versions||>= 4.9.4|
vzctl is a set of control tools for the OpenVZ server virtualization solution.
It was discovered that vzctl determined the virtual environment (VE) layout based on the presence of root.hdd/DiskDescriptor.xml in the VE private directory. This allows local simfs container (CT) root users to change the root password for arbitrary ploop containers. This is demonstrated by a symlink attack on the ploop container root.hdd file which can then be used to access a control panel.
An attacker with root privileges, in a simfs-based container, could gain control over ploop-based containers.
There is no known workaround at this time.
All vzctl users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-cluster/vzctl-4.9.4"
January 11, 2017
January 11, 2017: 1