Hello and Happy Holidays,
In the past few years many serious attacks against the memory
deduplication (KSM) feature of all hypervisors have been shown. [1] Even
allowing attackers to modify/steal APT keys and source lists on the
host. [2] Since its not enabled by default the fall out is relatively
low and easily mitigated.
New side-channel attacks against memory-ballon enabled VMs are beginning
to surface. Please consider documenting this and disabling this feature
for newly created VMs to have safe defaults.
[1] https://staff.aist.go.jp/c.artho/papers/EuroSec2011-suzaki.pdf
[2]
https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_razavi.pdf
[3] http://ieeexplore.ieee.org/document/7562068/
*Hint: If you can't see the IEEE paper use sci-hub.
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