Bug 1581637 (CVE-2017-13305)

Summary:	CVE-2017-13305 kernel: Buffer over-read in keyring subsystem allows exposing potentially sensitive information to local attacker
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	airlied, aquini, bhu, blc, bskeggs, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mmilgram, nmurray, plougher, rt-maint, rvrbovsk, skozina, steved, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.12	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel's implementation of valid_master_desc() in which a memory buffer would be compared to a userspace value with an incorrect size of comparison. By bruteforcing the comparison, an attacker could determine what was in memory after the description and possibly obtain sensitive information from kernel memory.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:26:24 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:	1582985
Bug Blocks:	1581641

Description Adam Mariš 2018-05-23 09:32:20 UTC

A flaw was found in the Linux kernels implementation of valid_master_desc() in which a memory buffer would be compared to a userspace value with an incorrect size of comparison.  By bruteforcing the comparison an attacker could determine what was in memory after the description.

This could allow a local attacker to obtain possibly sensitive information from kernel memory.

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=794b4bc292f5d31739d89c0202c54e7dc9bc3add

Comment 4 errata-xmlrpc 2018-07-10 17:16:51 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2018:2165 https://access.redhat.com/errata/RHSA-2018:2165