Date: Tue, 14 Nov 2023 11:24:30 -0800 From: Antonio Gomez Iglesias <antonio.gomez.iglesias@...el.com> To: HW42 <hw42@...umj.de>, <oss-security@...ts.openwall.com>, Solar Designer <solar@...nwall.com> CC: Tavis Ormandy <taviso@...il.com> Subject: Re: CVE-2023-23583: Intel - Denial of Service - Privilege Escalation (Reptar) On 11/14/23 11:19 AM, HW42 wrote: > Solar Designer: >> On Tue, Nov 14, 2023 at 10:31:51AM -0800, Antonio Gomez Iglesias wrote: >>> Name of the issue: Redundant Prefix Issue >>> >>> Description of the issue >>> Under certain microarchitectural conditions, Intel has identified cases >>> where execution of an instruction (REP MOVSB) encoded with a redundant >>> REX prefix may result in unpredictable system behavior resulting in a >>> system crash/hang, or, in some limited scenarios, may allow escalation >>> of privilege from CPL3 to CPL0. >>> This Redundant Prefix Issue is assigned CVE-2023-23583 with a CVSS Base >>> Score of 8.8 High CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. >>> >>> Mitigation >>> Intel is providing a microcode update to mitigate this issue: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20231114 >> Thank you, Antonio! >> >> Here's a writeup and reproducer tool by Tavis Ormandy: >> >> https://lock.cmpxchg8b.com/reptar.html >> >> The GitHub release page above links to Intel security advisory: >> >> https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00950.html >> >> which specifies what CPU generations are affected (from 10th generation >> Intel Core or 3rd generation Xeon Scalable to current), and links to a >> table with "an exhaustive list of processors" matched against this issue >> and previously disclosed issues: >> >> https://www.intel.com/content/www/us/en/developer/topic-technology/software-security-guidance/processors-affected-consolidated-product-cpu-model.html >> >> It also says "Please refer to the technical paper here for additional >> information", where "here" is a link supposedly to "the technical >> paper", but it's a non-existent page currently, so I'm not posting the >> URL yet (not sure if it'll stay the same when the page is published). > I think that link should point to > > https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/redundant-prefix-issue.html > > This one can be found in the affected processors table. The SA https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00950.html should now link to the correct page. Thanks for the feedback!
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