16 Jun
2010
16 Jun
'10
3:11 p.m.
On 06/16/2010 02:54 PM, Jamie Strandboge wrote:
Hi,
I noticed today that ebiptablesWriteToTempFile() creates a temporary file in /tmp that is later executed. It uses mkstemp() and therefore is safe from symlinks attacks, however, there is not really any reason that I can see why it is using /tmp instead of somewhere like /var/lib/libvirt. If libvirtd is confined under a MAC which allows execution of /tmp/virtd* and a vulnerability is found in libvirtd, the /tmp path leaves an opportunity for a local non-root attacker to write a script in /tmp and then subvert libvirt to execute that script.
I don't mind the move of the temporary file, but I'd like to understand how would someone subvert libvirt to run an arbitrary script? Stefan