Bug 1485346 (CVE-2017-13693)

Summary: CVE-2017-13693 kernel: ACPI operand cache leak in dsutils.c
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: agordeev, ahs3+donotuse, airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, dnelson, dominik.mierzejewski, eparis, esammons, esandeen, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, m.a.young, mchehab, mcressma, mguzik, mjg59, mlangsdo, nhorman, nmurray, pholasek, plougher, pmatouse, quintela, rt-maint, rvrbovsk, slawomir, williams, wmealing
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the kernel's ACPI interpreter when it does not flush the operand cache and causes a kernel stack dump. This allows local users to obtain sensitive information from kernel memory and bypass the KASLR protection mechanism.
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-09-15 11:52:44 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1485355, 1485356, 1488743, 1488744, 1488745, 1488746, 1488750    
Bug Blocks: 1485352    

Description Adam Mariš 2017-08-25 12:58:56 UTC
The acpi_ds_create_operands() function in drivers/acpi/acpica/dsutils.c
in the Linux kernel through 4.12.9 does not flush the operand cache and
causes a kernel stack dump, which allows local users to obtain
sensitive information from kernel memory and bypass the KASLR
protection mechanism (in the kernel through 4.9) via a crafted ACPI
table.

Upstream fix:

https://github.com/acpica/acpica/pull/295/commits/987a3b5cf7175916e2a4b6ea5b8e70f830dfe732
https://patchwork.kernel.org/patch/9919053/

Comment 1 Adam Mariš 2017-08-25 13:07:09 UTC
Created acpica-tools tracking bugs for this issue:

Affects: fedora-all [bug 1485355]


Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1485356]

Comment 4 Wade Mealing 2017-09-06 07:56:20 UTC
Statement:

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/

The Red Hat Security Response Team has rated this issue as having moderate security impact.

The risks associated with fixing this bug are greater than the moderate severity security risk. We therefore currently have no plans to fix this flaw in Red Hat Enterprise Linux 5,6,7 and Red Hat Enterprise MRG.