Bug 1497745 (CVE-2017-14954)

Summary:	CVE-2017-14954 kernel: Info leak in kernel_waitid()
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, 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, mchehab, mcressma, mguzik, mjg59, mlangsdo, nhorman, nmurray, plougher, quintela, rt-maint, rvrbovsk, steved, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	The waitid implementation in kernel/exit.c in the Linux kernel through 4.13.4 accesses rusage data structures in unintended cases. This can allow local users to obtain sensitive information and bypass the KASLR protection mechanism via a crafted system call.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-10-11 14:34:13 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:	1497747
Bug Blocks:	1497757

Description Adam Mariš 2017-10-02 14:55:48 UTC

The waitid implementation in kernel/exit.c in the Linux kernel through 4.13.4 accesses rusage data structures in unintended cases, which allows local users to obtain sensitive information, and bypass the KASLR protection mechanism, via a crafted system call.

Upstream patch:

https://github.com/torvalds/linux/commit/6c85501f2fabcfc4fc6ed976543d252c4eaf4be9

Reproducer:

https://grsecurity.net/~spender/exploits/wait_for_kaslr_to_be_effective.c

Comment 1 Adam Mariš 2017-10-02 14:56:55 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1497747]

Comment 4 Vladis Dronov 2017-10-11 14:34:13 UTC

Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2 as the code with the flaw is not present in the products listed.