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2013 Aug 20
0
Xen Security Advisory 59 (CVE-2013-3495) - Intel VT-d Interrupt Remapping engines can be evaded by native NMI interrupts
...LE SYSTEMS
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Xen version 3.3 onwards is vulnerable.
Only systems using Intel VT-d for PCI passthrough are vulnerable where system
firmware (BIOS) may enable SERR in Host Bridge device. In order to verify
whether SERR is enabled, one can read the SERR Enable (SERRE) bit (bit 8) in
PCICMD register (offset 0x4) in PCI configuration space of the Host Bridge
device (BDF 00:00.0). Value 1 of PCICMD[SERRE] indicates SERR logic is enabled.
It is currently not known whether all or just some chipsets supporting VT-d are
affected.
Any domain which is given access to a PCI device that is bu...