Bug 1295287 (CVE-2015-8709)

Summary:	CVE-2015-8709 Kernel: ptrace: potential privilege escalation in user namespaces
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aquini, arm-mgr, bhu, carnil, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, plougher, rt-maint, rvrbovsk, slong, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A privilege-escalation vulnerability was discovered in the Linux kernel built with User Namespace (CONFIG_USER_NS) support. The flaw occurred when the ptrace() system call was used on a root-owned process to enter a user namespace. A privileged namespace user could exploit this flaw to potentially escalate their privileges on the system, outside the original namespace.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:46:52 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:	1295288
Bug Blocks:	1295281

Description Prasad Pandit 2016-01-04 06:14:01 UTC

Linux kernel built with the User Namespaces(CONFIG_USER_NS) support is
vulnerable to a potential privilege escalation flaw. It could occur when a
root owned process tries to enter a user namespace, wherein a user attempts
to attach the entering process via ptrace(1).

A privileged name space user could use this flaw to potentially escalate their
privileges on the system.

Upstream fix:
-------------
  -> https://lkml.org/lkml/2015/12/25/71

Reference:
----------
  -> http://seclists.org/oss-sec/2015/q4/614

Comment 1 Prasad Pandit 2016-01-04 06:15:16 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1295288]

Comment 2 Prasad Pandit 2016-01-04 10:41:42 UTC

Statement:

This issue does not affect the versions of the kernel package as shipped with
Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.

Comment 4 Fedora Update System 2016-01-12 07:59:25 UTC

kernel-4.3.3-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2016-02-01 06:23:43 UTC

kernel-4.3.4-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.