Date: Tue, 12 Jul 2022 21:34:30 +0200 From: Salvatore Bonaccorso <carnil@...ian.org> To: oss-security@...ts.openwall.com Cc: xen-announce@...ts.xen.org, xen-devel@...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 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. Salvatore
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