Bug 1473209 (CVE-2017-11473)

Summary:	CVE-2017-11473 kernel: Buffer overflow in mp_override_legacy_irq()
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, aquini, bhu, blc, dhoward, esammons, fhrbata, gansalmon, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, mlangsdo, nmurray, pholasek, plougher, rt-maint, rvrbovsk, vdronov, 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:	Buffer overflow in the mp_override_legacy_irq() function in arch/x86/kernel/acpi/boot.c in the Linux kernel through 4.12.2 allows local users to gain privileges via a crafted ACPI table.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-07-24 13:21:28 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:	1473210, 1474371
Bug Blocks:	1473211

Description Adam Mariš 2017-07-20 08:50:21 UTC

Buffer overflow in the mp_override_legacy_irq() function in arch/x86/kernel/acpi/boot.c in the Linux kernel through 4.12.2 allows local users to gain privileges via a crafted ACPI table.

References:

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-11473

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11473

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dad5ab0db8deac535d03e3fe3d8f2892173fa6a4

Comment 1 Adam Mariš 2017-07-20 08:51:05 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1473210]

Comment 6 Justin M. Forbes 2018-01-29 16:22:20 UTC

This was fixed for Fedora with the 4.12.4 kernel updates

Comment 7 errata-xmlrpc 2018-04-10 05:03:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0654 https://access.redhat.com/errata/RHSA-2018:0654

Comment 8 Wade Mealing 2019-06-06 02:09:19 UTC

Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates of the Red Hat products. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

This attack requires 

- An attacker to be able to write to the ACPI tables ( local, privileged operation and non generalized attacks)
- The ability for the attacker to reboot the system  ( local, privileged operation )
- The ACPI table changes to persist through reboots  ( not common on cloud/serverless platforms )
- This modification to the table alone is able to possibly corrupt memory, but the corruption will not be enough alone, the corrupted affected memory will be overwritten with valid acpi struct data which also has to corrupt the memory in which a way the flaw can create abuse (HARD).
- The attacker will find it significantly difficult to abuse this a flaw in early-boot as injecting code/controlled execution at this point would require privileges.  If an attacker had this specific privilege, there are easier ways to gain privilege escalation.