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Date: Thu, 24 Dec 2015 11:32:30 -0500 (EST)
From: cve-assign@...re.org
To: ppandit@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE request Qemu: acpi: heap based buffer overrun during VM migration

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> Qemu emulator built with the Q35 chipset based pc system emulator is
> vulnerable to a heap based buffer overflow. It occurs during VM guest
> migration, as more(16 bytes) data is moved into allocated(8 bytes) memory
> area.
> 
> A privileged guest user could use this issue to corrupt the VM guest image,
> potentially leading to a DoS. This issue affects q35 machine types.
> 
> http://git.qemu.org/?p=qemu.git;a=commit;h=d9a3b33d2c9f996537b7f1d0246dee2d0120cefb
> https://bugzilla.redhat.com/show_bug.cgi?id=1283722

>> acpi: fix buffer overrun on migration
>> 
>> ich calls acpi_gpe_init with length ICH9_PMIO_GPE0_LEN so
>> ICH9_PMIO_GPE0_LEN/2 bytes are allocated, but then the full
>> ICH9_PMIO_GPE0_LEN bytes are migrated.
>> 
>> As a quick work-around, allocate twice the memory.

>> hw/acpi/core.c
>> acpi_gpe_init

Use CVE-2015-8666.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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