Re: [Qemu-stable] [PULL 0/3] Cve 2015 5154 patches

[John Snow]

On 07/27/2015 08:10 AM, Stefan Priebe - Profihost AG wrote:
> 
> Am 27.07.2015 um 14:01 schrieb John Snow:
>> The following changes since commit f793d97e454a56d17e404004867985622ca1a63b:
>>
>>   Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into 
>> staging (2015-07-24 13:07:10 +0100)
>>
>> are available in the git repository at:
>>
>>   https://github.com/jnsnow/qemu.git tags/cve-2015-5154-pull-request
> 
> Any details on this CVE? Is RCE possible? Only if IDE is used?
> 
> Stefan
> 

It's a heap overflow. The most likely outcome is a segfault, but the
guest is allowed to continue writing past the end of the PIO buffer at
its leisure. This makes it similar to CVE-2015-3456.

This CVE can be mitigated unlike CVE-2015-3456 by just removing the
CD-ROM drive until the patch can be applied.

>> for you to fetch changes up to cb72cba83021fa42719e73a5249c12096a4d1cfc:
>>
>>   ide: Clear DRQ after handling all expected accesses (2015-07-26 23:42:53 
>> -0400)
>>
>> ----------------------------------------------------------------
>>
>> ----------------------------------------------------------------
>>
>> Kevin Wolf (3):
>>   ide: Check array bounds before writing to io_buffer (CVE-2015-5154)
>>   ide/atapi: Fix START STOP UNIT command completion
>>   ide: Clear DRQ after handling all expected accesses
>>
>>  hw/ide/atapi.c |  1 +
>>  hw/ide/core.c  | 32 ++++++++++++++++++++++++++++----
>>  2 files changed, 29 insertions(+), 4 deletions(-)
>>