OpenStack Compute (nova)

  1. Bug #1253980
  2. Comment #25

Comment 25 for bug 1253980

Revision history for this message
Thierry Carrez (ttx) wrote : Re: DoS attack via setting os_type in snapshots.

OK, how about:

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Title: Nova compute DoS through ephemeral disk backing files
Reporter: Phil Day (HP)
Products: Nova
Affects: All supported versions

Description:
Phil Day from HP reported a vulnerability in the libvirt driver handling of ephemeral disk backing files on Nova compute nodes. By repeatedly creating snapshots, changing the os_type to a new random value, and spawning new instances from the snapshot (and quickly deleting those instances), an authenticated user could generate lots of different ephemeral disk backing files and fill up compute node disks, potentially resulting in a Denial of Service against a Nova setup. Only Nova setups running the libvirt driver are affected.
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