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Category:   OS (UNIX)  >   FreeBSD Kernel Vendors:   FreeBSD
FreeBSD IGMP Integer Overflow Lets Remote Users Deny Service
SecurityTracker Alert ID:  1031798
SecurityTracker URL:
CVE Reference:   CVE-2015-1414   (Links to External Site)
Updated:  Apr 8 2015
Original Entry Date:  Feb 25 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.4, 9.3, 10.0, 10.1
Description:   A vulnerability was reported in FreeBSD. A remote user can cause denial of service conditions on the target system.

A remote user can send specially crafted IGMPv3 data to trigger an integer overflow in igmp_input() and cause the target kernel to crash.

Mateusz Kocielski, Logicaltrust, Marek Kroemeke, and 22733db72ab3ed94b5f8a1ffcde850251fe6f466 reported this vulnerability.

Impact:   A remote user can cause the target system to crash.
Solution:   FreeBSD has issued a fix.

On April 7, 2015, the vendor updated their advisory to indicate that a revised patch was issued to address a potential overflow issue.

The FreeBSD advisory is available at:

Cause:   Boundary error

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 5 2015 (McAfee Issues Fix for McAfee Firewall Enterprise) FreeBSD IGMP Integer Overflow Lets Remote Users Deny Service
McAfee has issued a fix for McAfee Firewall Enterprise.

 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-15:04.igmp

Hash: SHA512

FreeBSD-SA-15:04.igmp                                       Security Advisory
                                                          The FreeBSD Project

Topic:          Integer overflow in IGMP protocol

Category:       core
Module:         igmp
Announced:      2015-02-25
Credits:        Mateusz Kocielski, Logicaltrust,
                Marek Kroemeke, and 22733db72ab3ed94b5f8a1ffcde850251fe6f466
Affects:        All supported versions of FreeBSD.
Corrected:      2015-02-25 05:43:02 UTC (stable/10, 10.1-STABLE)
                2015-02-25 05:56:16 UTC (releng/10.1, 10.1-RELEASE-p6)
                2015-02-25 05:56:16 UTC (releng/10.0, 10.0-RELEASE-p18)
                2015-02-25 05:43:02 UTC (stable/9, 9.3-STABLE)
                2015-02-25 05:56:54 UTC (releng/9.3, 9.3-RELEASE-p10)
                2015-02-25 05:43:02 UTC (stable/8, 8.4-STABLE)
                2015-02-25 05:56:54 UTC (releng/8.4, 8.4-RELEASE-p24)
CVE Name:       CVE-2015-1414

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:>.

I.   Background

IGMP is a control plane protocol used by IPv4 hosts and routers to propagate
multicast group membership information.  IGMP version 3 is implemented on

II.  Problem Description

An integer overflow in computing the size of IGMPv3 data buffer can result
in a buffer which is too small for the requested operation.

III. Impact

An attacker who can send specifically crafted IGMP packets could cause a
denial of service situation by causing the kernel to crash.

IV.  Workaround

Block incoming IGMP packets by protecting your host/networks with a firewall.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch
# fetch
# gpg --verify igmp.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel as described in
<URL:> and reboot the

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/8/                                                         r279263
releng/8.4/                                                       r279265
stable/9/                                                         r279263
releng/9.3/                                                       r279265
stable/10/                                                        r279263
releng/10.0/                                                      r279264
releng/10.1/                                                      r279264
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://

Or visit the following URL, replacing NNNNNN with the revision number:


VII. References


The latest revision of this advisory is available at
Version: GnuPG v2.1.1 (FreeBSD)

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