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Bug 1192132 - (CVE-2015-0272) CVE-2015-0272 NetworkManager: remote DoS using IPv6 RA with bogus MTU
CVE-2015-0272 NetworkManager: remote DoS using IPv6 RA with bogus MTU
Status: CLOSED ERRATA
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=20150223,repor...
: Security
Depends On: 1183051 1260931
Blocks: 1192133 1210268
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Reported: 2015-02-12 11:41 EST by Vasyl Kaigorodov
Modified: 2017-06-27 04:17 EDT (History)
44 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was discovered that NetworkManager would set device MTUs based on MTU values received in IPv6 RAs (Router Advertisements), without sanity checking the MTU value first. A remote attacker could exploit this flaw to create a denial of service attack, by sending a specially crafted IPv6 RA packet to disturb IPv6 communication.
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Clone Of:
Environment:
Last Closed: 2017-06-27 04:17:56 EDT
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CRM:
Verified Versions:
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oVirt Team: ---
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-2015:2315 normal SHIPPED_LIVE Moderate: NetworkManager security, bug fix, and enhancement update 2015-11-19 05:06:58 EST

  None (edit)
Description Vasyl Kaigorodov 2015-02-12 11:41:03 EST 
It was reported [1] that it's possible to craft a Router Advertisement message which will bring the receiver in a state where new IPv6 connections will not be accepted until correct Router Advertisement message received.

[1]: https://bugzilla.redhat.com/show_bug.cgi?id=1183051#c3
Comment 1 Salvatore Bonaccorso 2015-09-03 02:22:17 EDT 
Hi Vasyl

The referenced other report seems restricted. Is there any more information you can share on CVE-2015-0272 (e.g. affected versions, fixing commit)?

Regards,
Salvatore
Comment 3 Stefan Cornelius 2015-09-08 05:06:47 EDT 
Created NetworkManager tracking bugs for this issue:

Affects: fedora-all [bug 1260931]
Comment 4 Stefan Cornelius 2015-09-08 05:36:21 EDT 
It was discovered that NetworkManager would set device MTUs based on the MTU values received in IPv6 RAs (Router Advertisements), without checking the MTU value for sanity first. A remote attacker could exploit this attack to disturb IPv6 communication by sending a specially crafted IPv6 RA packet.

NetworkManager patch:
http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=d5fc88e573fa58b93034b04d35a2454f5d28cad9

There's also a patch for the kernel to harden against invalid MTUs (the file to set the MTU is root owned, though):
http://article.gmane.org/gmane.linux.network/351269
Comment 6 errata-xmlrpc 2015-11-19 06:00:07 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:2315 https://rhn.redhat.com/errata/RHSA-2015-2315.html
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