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Message-ID: <57b84d81-b689-f05f-d4a8-9967078fdc04@citrix.com>
Date: Wed, 13 Jul 2022 09:27:34 +0000
From: Andrew Cooper <Andrew.Cooper3@...rix.com>
To: Salvatore Bonaccorso <carnil@...ian.org>,
"oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
CC: "xen-announce@...ts.xen.org" <xen-announce@...ts.xen.org>,
"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
"xen-users@...ts.xen.org" <xen-users@...ts.xen.org>, Xen.org security team
<security-team-members@....org>
Subject: Re: Xen Security Advisory 407 v1
(CVE-2022-23816,CVE-2022-23825,CVE-2022-29900) - Retbleed - arbitrary
speculative code execution with return instructions
On 12/07/2022 20:34, Salvatore Bonaccorso wrote:
> Hi,
>
> On Tue, Jul 12, 2022 at 09:27:07PM +0200, Salvatore Bonaccorso wrote:
>> Hi,
>>
>> On Tue, Jul 12, 2022 at 04:36:10PM +0000, Xen.org security team wrote:
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA256
>>>
>>> Xen Security Advisory CVE-2022-23816,CVE-2022-23825,CVE-2022-29900 / XSA-407
>>>
>>> Retbleed - arbitrary speculative code execution with return instructions
>>>
>>> ISSUE DESCRIPTION
>>> =================
>>>
>>> Researchers at ETH Zurich have discovered Retbleed, allowing for
>>> arbitrary speculative execution in a victim context.
>>>
>>> For more details, see:
>>> https://comsec.ethz.ch/retbleed
>>>
>>> ETH Zurich have allocated CVE-2022-29900 for AMD and CVE-2022-29901 for
>>> Intel.
>>>
>>> Despite the similar preconditions, these are very different
>>> microarchitectural behaviours between vendors.
>>>
>>> On AMD CPUs, Retbleed is one specific instance of a more general
>>> microarchitectural behaviour called Branch Type Confusion. AMD have
>>> assigned CVE-2022-23816 (Retbleed) and CVE-2022-23825 (Branch Type
>>> Confusion).
>>>
>>> For more details, see:
>>> https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1037
>> Is it confirmed that AMD is not using CVE-2022-29900? The above
>> amd-sb-1037 references as well both CVE-2022-23825 (Branch Type
>> Confusion) and CVE-2022-29900 (RETbleed), so I assume they agreed to
>> use CVE-2022-29900 for retbleed?
>>
>> So should the Xen advisory as well use CVE-2022-23825,CVE-2022-29900
>> and CVE-2022-29901?
> Nevermind, I missunderstood the wording and the advisory just mentions
> all the related CVEs correctly and made a thinko. It might turn out
> that CVE-2022-23816 will not be used, but then the title would read
> only as
>
> Xen Security Advisory CVE-2022-23825,CVE-2022-29900 / XSA-407
>
> So please disregard the question above.
/sigh
AMD changed the CVE in the bulletin between the final draft, and what
went public.
CVE-2022-23816 has been referenced by multiple other vendors too, so is
definitely out in the world. Hopefully MITRE will close out one of
CVE-2022-23816 and CVE-2022-29900 as a dup of the other.
For now, I think the least confusing option is to keep both referenced.
~Andrew
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