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Posted on 14 January 2014
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FreeBSD-SA-14:01.bsnmpd Security Advisory
The FreeBSD Project
Topic: bsnmpd remote denial of service vulnerability
Category: contrib
Module: bsnmp
Announced: 2014-01-14
Credits: Dirk Meyer
Affects: All supported versions of FreeBSD.
Corrected: 2014-01-14 19:02:14 UTC (stable/10, 10.0-PRERELEASE)
2014-01-14 19:10:38 UTC (releng/10.0, 10.0-RELEASE)
2014-01-14 19:10:38 UTC (releng/10.0, 10.0-RC5-p1)
2014-01-14 19:10:38 UTC (releng/10.0, 10.0-RC4-p1)
2014-01-14 19:10:38 UTC (releng/10.0, 10.0-RC3-p1)
2014-01-14 19:10:38 UTC (releng/10.0, 10.0-RC2-p1)
2014-01-14 19:10:38 UTC (releng/10.0, 10.0-RC1-p1)
2014-01-14 19:17:20 UTC (stable/9, 9.2-STABLE)
2014-01-14 19:42:28 UTC (releng/9.2, 9.2-RELEASE-p3)
2014-01-14 19:42:28 UTC (releng/9.1, 9.1-RELEASE-p10)
2014-01-14 19:17:20 UTC (stable/8, 8.4-STABLE)
2014-01-14 19:42:28 UTC (releng/8.4, 8.4-RELEASE-p7)
2014-01-14 19:42:28 UTC (releng/8.3, 8.3-RELEASE-p14)
CVE Name: CVE-2014-1452
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.
I. Background
The bsnmpd is a simple and extensible SNMP daemon serves the Internet SNMP
(Simple Network Management Protocol).
II. Problem Description
The bsnmpd(8) daemon is prone to a stack-based buffer-overflow when it
has received a specifically crafted GETBULK PDU request.
III. Impact
This issue could be exploited to execute arbitrary code in the context of
the service daemon, or crash the service daemon, causing a denial-of-service.
IV. Workaround
No workaround is available, but systems not running bsnmpd(8) are not
vulnerable.
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 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 http://security.FreeBSD.org/patches/SA-14:01/bsnmpd.patch
# fetch http://security.FreeBSD.org/patches/SA-14:01/bsnmpd.patch.asc
# gpg --verify bsnmpd.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
Recompile the operating system using buildworld and installworld as
described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.
Restart the bsnmpd(8) daemons, or reboot the system.
3) 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
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/8/ r260642
releng/8.3/ r260647
releng/8.4/ r260647
stable/9/ r260642
releng/9.1/ r260647
releng/9.2/ r260647
stable/10/ r260638
releng/10.0/ r260640
- -------------------------------------------------------------------------
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://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:
<URL:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
VII. References
<other info on vulnerability>
<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1452>
The latest revision of this advisory is available at
<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-14:01.bsnmpd.asc>
