GLSA-201701-30 : vzctl: Security bypass
Low Nessus Plugin ID 96424
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-201701-30 (vzctl: Security bypass)
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.
SolutionAll vzctl users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=sys-cluster/vzctl-4.9.4'