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ubuntucveUbuntu.comUB:CVE-2016-10142
HistoryJan 14, 2017 - 12:00 a.m.

CVE-2016-10142

2017-01-1400:00:00
ubuntu.com
ubuntu.com
12

8.6 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

0.006 Low

EPSS

Percentile

78.9%

An issue was discovered in the IPv6 protocol specification, related to ICMP
Packet Too Big (PTB) messages. (The scope of this CVE is all affected IPv6
implementations from all vendors.) The security implications of IP
fragmentation have been discussed at length in [RFC6274] and [RFC7739]. An
attacker can leverage the generation of IPv6 atomic fragments to trigger
the use of fragmentation in an arbitrary IPv6 flow (in scenarios in which
actual fragmentation of packets is not needed) and can subsequently perform
any type of fragmentation-based attack against legacy IPv6 nodes that do
not implement [RFC6946]. That is, employing fragmentation where not
actually needed allows for fragmentation-based attack vectors to be
employed, unnecessarily. We note that, unfortunately, even nodes that
already implement [RFC6946] can be subject to DoS attacks as a result of
the generation of IPv6 atomic fragments. Let us assume that Host A is
communicating with Host B and that, as a result of the widespread dropping
of IPv6 packets that contain extension headers (including fragmentation)
[RFC7872], some intermediate node filters fragments between Host B and Host
A. If an attacker sends a forged ICMPv6 PTB error message to Host B,
reporting an MTU smaller than 1280, this will trigger the generation of
IPv6 atomic fragments from that moment on (as required by [RFC2460]). When
Host B starts sending IPv6 atomic fragments (in response to the received
ICMPv6 PTB error message), these packets will be dropped, since we
previously noted that IPv6 packets with extension headers were being
dropped between Host B and Host A. Thus, this situation will result in a
DoS scenario. Another possible scenario is that in which two BGP peers are
employing IPv6 transport and they implement Access Control Lists (ACLs) to
drop IPv6 fragments (to avoid control-plane attacks). If the aforementioned
BGP peers drop IPv6 fragments but still honor received ICMPv6 PTB error
messages, an attacker could easily attack the corresponding peering session
by simply sending an ICMPv6 PTB message with a reported MTU smaller than
1280 bytes. Once the attack packet has been sent, the aforementioned
routers will themselves be the ones dropping their own traffic.

Bugs

Notes

Author Note
jdstrand android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.10 and earlier preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support
OSVersionArchitecturePackageVersionFilename
ubuntu12.04noarchlinux< 3.2.0-85.122UNKNOWN
ubuntu14.04noarchlinux< 3.13.0-51.84UNKNOWN
ubuntu12.04noarchlinux-armadaxp< 3.2.0-1651.71UNKNOWN
ubuntu12.04noarchlinux-lts-trusty< 3.13.0-51.84~precise1UNKNOWN
ubuntu12.04noarchlinux-ti-omap4< 3.2.0-1465.85UNKNOWN

8.6 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

0.006 Low

EPSS

Percentile

78.9%

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