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Bug 1525768 - (CVE-2017-17448) CVE-2017-17448 kernel: Missing capabilities check in net/netfilter/nfnetlink_cthelper.c allows for unprivileged access to systemwide nfnl_cthelper_list structure
CVE-2017-17448 kernel: Missing capabilities check in net/netfilter/nfnetlink_...
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=20171203,repor...
: Security
Depends On: 1525769 1539229 1539230 1539231
Blocks: 1525773
  Show dependency tree / graph
 
Reported: 2017-12-13 21:02 EST by Sam Fowler
Modified: 2018-08-28 18:27 EDT (History)
39 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
The net/netfilter/nfnetlink_cthelper.c function in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations. This allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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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 04:16 EDT
Red Hat Product Errata RHSA-2018:1062 None None None 2018-04-10 05:40 EDT

  None (edit)
Description Sam Fowler 2017-12-13 21:02:09 EST 
net/netfilter/nfnetlink_cthelper.c in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations, which allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.

References:

https://patchwork.kernel.org/patch/10089373/

https://xorl.wordpress.com/2017/12/10/cve-2017-17448-linux-kernel-cthelper-security-bypass/

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4b380c42f7d00a395feede754f0bc2292eebe6e5
Comment 1 Sam Fowler 2017-12-13 21:03:39 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1525769]
Comment 5 Vladis Dronov 2018-01-26 21:00:29 EST 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2, as a code with the flaw is not present or is not built 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 Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.
Comment 6 Vladis Dronov 2018-01-26 21:01:04 EST 
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 7 errata-xmlrpc 2018-04-10 01:11:03 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 8 errata-xmlrpc 2018-04-10 04:15:58 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 9 errata-xmlrpc 2018-04-10 05:39:47 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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