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Bug 1485348 - (CVE-2017-13694) CVE-2017-13694 kernel: ACPI node and node_ext cache leak
CVE-2017-13694 kernel: ACPI node and node_ext cache leak
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170623,repor...
: Security
Depends On: 1485355 1489243 1485356 1489241 1489242
Blocks: 1485353
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Reported: 2017-08-25 08:59 EDT by Adam Mariš
Modified: 2017-09-15 07:54 EDT (History)
51 users (show)

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Doc Text:
The ACPI parsing functionality in the Linux kernel does not flush the node and node_ext caches which causes a kernel stack dump. This allows local users to obtain sensitive information from kernel memory and use this information to bypass the KASLR protection mechanism by creating and applying crafted ACPI table.
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Last Closed: 2017-09-15 07:54:42 EDT
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Description Adam Mariš 2017-08-25 08:59:31 EDT
The acpi_ps_complete_final_op() function in drivers/acpi/acpica/psobject.c in the Linux kernel does not flush the node and node_ext caches and causes a kernel stack dump, which allows local users to obtain sensitive information from kernel
memory and use this information to bypass the KASLR protection mechanism via a crafted ACPI table.

Upstream fix:

https://github.com/acpica/acpica/pull/278/commits/4a0243ecb4c94e2d73510d096c5ea4d0711fc6c0
https://patchwork.kernel.org/patch/9806085/
Comment 1 Adam Mariš 2017-08-25 09:05:58 EDT
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 23:25:02 EDT
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.

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