Bug 1185139 (CVE-2015-1350)

Summary:	CVE-2015-1350 kernel: denial of service in notify_change for filesystem xattrs
Product:	[Other] Security Response	Reporter:	Wade Mealing <wmealing>
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, carnil, dhoward, fhrbata, gansalmon, itamar, jforbes, jonathan, jwboyer, kernel-maint, kernel-mgr, lwang, madhu.chinakonda, mchehab, mguzik, nmurray, pholasek, plougher, pmatouse, rvrbovsk
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	It was found that a regular user could remove xattr permissions on files by using the chown or write system calls. A local attacker could use this flaw to deny elevated permissions from valid users, services, or applications, potentially resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-11-02 15:33:35 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:	1185142, 1185143, 1185144, 1185145, 1186117, 1192874, 1195677, 1195678, 1195679
Bug Blocks:	1167369

Description Wade Mealing 2015-01-23 04:53:23 UTC

A flaw was found where a regular user could remove xattr permissions on files by using the chown or write systemcalls.  An attacker could use this feature to remove capabilities effectively denying elevated permissions to valid users.  Certain services and applications require the capabilities subsystem to work correctly.

Discussed here: 

 https://lkml.org/lkml/2015/1/17/145

As of 3.19 release, this commit is NOT in mainline tree.

Comment 4 Wade Mealing 2015-01-27 04:33:29 UTC

Statement: 

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7 and MRG 2.

This has been rated as having Low 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

Comment 6 Wade Mealing 2015-02-16 03:00:33 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1192874]