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Bug 1547824 - (CVE-2018-1065) CVE-2018-1065 kernel: netfilter: xtables NULL pointer dereference in ip6_tables.c:ip6t_do_table() leading to a crash
CVE-2018-1065 kernel: netfilter: xtables NULL pointer dereference in ip6_tabl...
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=20180204,repor...
: Security
Depends On: 1547827 1547831 1550791
Blocks: 1542365
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Reported: 2018-02-21 22:32 EST by Sam Fowler
Modified: 2018-10-30 04:58 EDT (History)
44 users (show)

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Fixed In Version:
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Doc Text:
A flaw was found in the netfilter/iptables subsystem. A user with the netfilter modification capabilities could insert a rule which could panic the system.
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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-2018:2948 None None None 2018-10-30 04:58 EDT

  None (edit)
Description Sam Fowler 2018-02-21 22:32:40 EST 
The Linux kernel at version 4.15.0-rc9 is vulnerable to a NULL pointer dereference ip6_tables.c:ip6t_do_table() leading to a crash. This vulnerability is only present under certain malformed iptables rulesets.

Inserting malformed rules its a privileged operation as root or a user with CAP_NET_RAW,CAP_NET_ADMIN capabilities ( see man setcap(8) ).

As this requires advanced privileges Red Hat Product Security has rated this flaw as moderate.

Additional References:

Netdev list:
http://lists.openwall.net/netdev/2018/01/27/46

A suggested upstream patch:
http://patchwork.ozlabs.org/patch/870355/

An upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=57ebd808a97d7
Comment 3 Sam Fowler 2018-02-21 23:12:55 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1547831]
Comment 10 errata-xmlrpc 2018-10-30 04:57:42 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2948 https://access.redhat.com/errata/RHSA-2018:2948
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