Bug 1086730 (CVE-2014-2851)

Summary:	CVE-2014-2851 kernel: net: ping: refcount issue in ping_init_sock() function
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, aquini, bhu, carnil, davej, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jkurik, jonathan, jross, jscalf, jwboyer, kernel-maint, kernel-mgr, kseifried, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, mjc, nobody, npajkovs, pholasek, plougher, rt-maint, rvrbovsk, sreber, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A use-after-free flaw was found in the way the ping_init_sock() function of the Linux kernel handled the group_info reference counter. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-07-29 16:32:38 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:	1087412, 1087414, 1087415, 1087416, 1087418, 1087419, 1087420, 1087478
Bug Blocks:	1086734

Description Petr Matousek 2014-04-11 11:50:15 UTC

A flaw was found in the way ping_init_sock() function handled group_info struct reference counter. Since group_info refcounter is only incremented but never decremented in this codepath, it could lead to refcounter overflow and possibly to use-after-free issue later.

An unprivileged local user could use this flaw to crash the system or, potentially, escalate their privileges on the system.

Upstream patch proposal:
https://lkml.org/lkml/2014/4/10/736

Comment 1 Petr Matousek 2014-04-11 11:52:15 UTC

Statement:

This issue does not affect Linux kernel packages as shipped with Red Hat Enterprise Linux 5.

Comment 2 Petr Matousek 2014-04-14 10:14:49 UTC

Upstream commit:

https://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=b04c46190219a4f845e46a459e3102137b7f6cac

Comment 5 Petr Matousek 2014-04-14 10:18:28 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1087420]

Comment 7 Fedora Update System 2014-04-18 15:36:03 UTC

kernel-3.13.10-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2014-05-06 03:31:39 UTC

kernel-3.13.11-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 10 errata-xmlrpc 2014-05-27 16:27:55 UTC

This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:0557 https://rhn.redhat.com/errata/RHSA-2014-0557.html

Comment 11 errata-xmlrpc 2014-06-24 15:58:53 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:0786 https://rhn.redhat.com/errata/RHSA-2014-0786.html

Comment 12 errata-xmlrpc 2014-07-29 15:52:44 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:0981 https://rhn.redhat.com/errata/RHSA-2014-0981.html

Comment 13 Martin Prpič 2014-08-25 09:09:55 UTC

IssueDescription:

A use-after-free flaw was found in the way the ping_init_sock() function of the Linux kernel handled the group_info reference counter. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system.

Comment 14 errata-xmlrpc 2014-08-27 14:01:59 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.4 EUS - Server and Compute Node Only

Via RHSA-2014:1101 https://rhn.redhat.com/errata/RHSA-2014-1101.html

Comment 15 Mark J. Cox 2016-01-05 09:07:16 UTC

interesting discussion of exploitability:

https://cyseclabs.com/page?n=02012016