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Bug 1086730 - (CVE-2014-2851) CVE-2014-2851 kernel: net: ping: refcount issue in ping_init_sock() function
CVE-2014-2851 kernel: net: ping: refcount issue in ping_init_sock() function
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20140411,repo...
: Security
Depends On: 1087412 1087414 1087415 1087416 1087418 1087419 1087420 1087478
Blocks: 1086734
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Reported: 2014-04-11 07:50 EDT by Petr Matousek
Modified: 2016-01-05 04:07 EST (History)
37 users (show)

See Also:
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.
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Clone Of:
Environment:
Last Closed: 2014-07-29 12:32:38 EDT
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CRM:
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RHEL 7.3 requirements from Atomic Host:


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Description Petr Matousek 2014-04-11 07:50:15 EDT
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 07:52:15 EDT
Statement:

This issue does not affect Linux kernel packages as shipped with Red Hat Enterprise Linux 5.
Comment 5 Petr Matousek 2014-04-14 06:18:28 EDT
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1087420]
Comment 7 Fedora Update System 2014-04-18 11:36:03 EDT
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 2014-05-05 23:31:39 EDT
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 12:27:55 EDT
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 11:58:53 EDT
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 11:52:44 EDT
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 Prpic 2014-08-25 05:09:55 EDT
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 10:01:59 EDT
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 (Product Security) 2016-01-05 04:07:16 EST
interesting discussion of exploitability:

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

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