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Bug 1531174 - (CVE-2017-15129) CVE-2017-15129 kernel: net: double-free and memory corruption in get_net_ns_by_id()
CVE-2017-15129 kernel: net: double-free and memory corruption in get_net_ns_b...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20171219,repor...
: Security
Depends On: 1531550 1531535 1531544 1531551 1531552 1531553
Blocks: 1527099
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Reported: 2018-01-04 13:21 EST by Pedro Sampaio
Modified: 2018-08-28 18:31 EDT (History)
44 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A use-after-free vulnerability was found in a network namespaces code affecting the Linux kernel since v4.0-rc1 through v4.15-rc5. The function get_net_ns_by_id() does not check for the net::count value after it has found a peer network in netns_ids idr which could lead to double free and memory corruption. This vulnerability could allow an unprivileged local user to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although it is thought to be unlikely.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0654 None None None 2018-04-10 01:11 EDT
Red Hat Product Errata RHSA-2018:0676 None None None 2018-04-10 04:17 EDT
Red Hat Product Errata RHSA-2018:1062 None None None 2018-04-10 05:41 EDT

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Description Pedro Sampaio 2018-01-04 13:21:57 EST 
A use-after-free vulnerability was found in a network namespaces code affecting the Linux kernel since v4.0-rc1 through v4.15-rc5. The function get_net_ns_by_id() does not check for the net::count value after it has found a peer network in netns_ids idr which could lead to double free and memory corruption. This vulnerability could allow an unprivileged local user to induce kernel memory corruption on the system, leading to a crash. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

References:

https://marc.info/?l=linux-netdev&m=151370451121029&w=2

https://marc.info/?t=151370468900001&r=1&w=2 (a whole thread)

http://seclists.org/oss-sec/2018/q1/7

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=21b5944350052d2583e82dd59b19a9ba94a007f0
Comment 1 Vladis Dronov 2018-01-05 07:32:56 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1531535]
Comment 2 Vladis Dronov 2018-01-05 07:46:01 EST 
Acknowledgments:

Name: Kirill Tkhai
Comment 3 Justin M. Forbes 2018-01-05 07:57:34 EST 
This was fixed for all Fedora releases with the 4.14.11 kernel updates.
Comment 7 Vladis Dronov 2018-01-05 08:59:04 EST 
Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6 as the code with the flaw is not present in the products listed.

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future updates for the respective releases may address this issue.
Comment 8 Vladis Dronov 2018-01-05 09:03:11 EST 
Notice:

What is Red Hat Enterprise Linux 7 for ARM 64,
        Red Hat Enterprise Linux 7 for Power 9 LE

The kernel package as shipped with Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE is an updated kernel intended to support new architectures not available at the time of Red Hat Enterprise Linux 7 original shipping. The new kernel version is based on an upstream Linux kernel version 4.11. The offering is distributed with other updated packages, but most of the userspace is the standard Red Hat Enterprise Linux 7 Server RPM files.

For more information please refer to:

https://access.redhat.com/articles/3158541
https://access.redhat.com/articles/3158511
Comment 9 errata-xmlrpc 2018-04-10 01:11:40 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0654 https://access.redhat.com/errata/RHSA-2018:0654
Comment 10 errata-xmlrpc 2018-04-10 04:17:16 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0676 https://access.redhat.com/errata/RHSA-2018:0676
Comment 11 errata-xmlrpc 2018-04-10 05:41:08 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:1062 https://access.redhat.com/errata/RHSA-2018:1062
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