[Openstack-security] [Bug 1765734] Re: one can bypass filters and execute arbitrary commands on namespaces
** Changed in: ossa
Status: New => Won't Fix
** Tags added: security
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one can bypass filters and execute arbitrary commands on namespaces
Status in oslo.rootwrap:
Status in OpenStack Security Advisory:
When this filter  is enabled in conjunction with IpNetnsExecFilter,
only commands allowed explicitly through the CommandFilter should get
to execute in the specified namespace.
However, due to the fact that these two commands are exactly the same:
ip netns exec $namespace echo $my_ssh_key >> /root/.ssh/authorized_keys
ip net exec $namespace echo $my_ssh_key >> /root/.ssh/authorized_keys
One can execute the latter without any CommandFilter for the 'echo' command.
This is a big security issue since anyone can make changes to the filesystem and execute arbitrary commands bypassing the IpNetnsExecFilter.
The solution is simply patching this code  by checking that the
second element starts with 'net', and the third one starts with 'e'.
 ip: IpFilter, ip, root
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