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Bug 1190966 - (CVE-2015-1573) CVE-2015-1573 kernel: panic while flushing nftables rules that reference deleted chains.
CVE-2015-1573 kernel: panic while flushing nftables rules that reference dele...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20150116,reported=2...
: Security
Depends On: 1192880 1192881 1192884 1192885 1223893
Blocks: 1187578
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Reported: 2015-02-10 01:30 EST by Wade Mealing
Modified: 2015-06-23 08:18 EDT (History)
23 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was found in the way the nft_flush_table() function of the Linux kernel's netfilter tables implementation flushed rules that were referencing deleted chains. A local user who has the CAP_NET_ADMIN capability could use this flaw to crash the system.
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Clone Of:
Environment:
Last Closed: 2015-06-23 08:18:00 EDT
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Regression: ---
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Documentation: ---
CRM:
Verified Versions:
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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-2015:1137 normal SHIPPED_LIVE Important: kernel security and bug fix update 2015-06-23 08:46:59 EDT
Red Hat Product Errata RHSA-2015:1138 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2015-06-23 08:28:04 EDT
Red Hat Product Errata RHSA-2015:1139 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2015-06-23 08:24:45 EDT

  None (edit)
Description Wade Mealing 2015-02-10 01:30:09 EST 
A flaw was found in the nft_flush_table function in the Linux kernel netfilter tables implementation.  The kernel would panic if it was commanded to flush rules referencing chains that had already been deleted. 

A local attacker with the CAP_NET_ADMIN capability could use this to panic (denial of service) a system if they were able to flush an effected chain.

Docker images with "root" permissions are not granted this capability by default.  Systems with privileged containers (started with docker run -privileged .. ) will be able to expose the system to this condition allowing the defect to be exploited.

Upstream commit fixing the problem:
http://git.kernel.org/cgit/linux/kernel/git/pablo/nf.git/commit/?id=a2f18db0c68fec96631c10cad9384c196e9008ac

CVE request:
http://seclists.org/oss-sec/2015/q1/501
Comment 4 Wade Mealing 2015-04-21 20:09:30 EDT 
Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6 (as they did not include support for netfilter tables API).

This issue affects the versions of the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG 2. Future kernel updates for the respective releases may address this issue.
Comment 7 errata-xmlrpc 2015-06-23 04:25:35 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1139 https://rhn.redhat.com/errata/RHSA-2015-1139.html
Comment 8 errata-xmlrpc 2015-06-23 04:28:56 EDT 
This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2015:1138 https://rhn.redhat.com/errata/RHSA-2015-1138.html
Comment 9 errata-xmlrpc 2015-06-23 04:47:55 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1137 https://rhn.redhat.com/errata/RHSA-2015-1137.html
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