FreeBSD Security Advisories
2014-Dec-17 08:36 UTC
FreeBSD Security Advisory FreeBSD-SA-14:30.unbound
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============================================================================FreeBSD-SA-14:30.unbound
Security Advisory
The FreeBSD Project
Topic: unbound remote denial of service vulnerability
Category: contrib
Module: unbound
Announced: 2014-12-17
Affects: FreeBSD 10.0-RELEASE and later
Credits: Florian Maury (ANSSI)
Corrected: 2014-12-17 06:58:00 UTC (stable/10, 10.1-STABLE)
2014-12-17 06:59:47 UTC (releng/10.1, 10.1-RELEASE-p2)
2014-12-17 06:59:47 UTC (releng/10.0, 10.0-RELEASE-p14)
CVE Name: CVE-2014-8602
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.
I. Background
Unbound is a validating, recursive, and caching DNS resolver.
II. Problem Description
By causing queries to be made against a maliciously-constructed zone or
against a malicious DNS server, an attacker who is able to cause
specific queries to be sent to a nameserver can trick unbound(8) resolver
into following an endless series of delegations, which consumes a lot of
resources.
III. Impact
Unbound will spend a lot of resources on this query, and this will impact
unbound's CPU and network resources. Unbound may therefore lose some
ability or timelines for the service of customer queries (a denial of
service). Unbound will continue to respond normally for cached queries.
IV. Workaround
No workaround is available, but hosts not running unbound(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 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.
[FreeBSD 10.x]
# fetch https://security.FreeBSD.org/patches/SA-14:30/unbound.patch
# fetch https://security.FreeBSD.org/patches/SA-14:30/unbound.patch.asc
# gpg --verify unbound.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
Restart the unbound(8) daemons, or reboot the system.
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/10/ r275853
releng/10.0/ r275854
releng/10.1/ r275854
- -------------------------------------------------------------------------
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:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
VII. References
<URL:https://unbound.net/downloads/CVE-2014-8602.txt>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8602>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-14:30.unbound.asc>
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Hi, I am curios why the installer wants to delete "/". This is from when I ran the update: [root at seed ~]# freebsd-update fetch Looking up update.FreeBSD.org mirrors... none found. Fetching metadata signature for 10.1-RELEASE from update.FreeBSD.org... done. Fetching metadata index... done. Fetching 2 metadata patches.. done. Applying metadata patches... done. Inspecting system... done. Preparing to download files... done. Fetching 5 patches... done. Applying patches... done. Fetching 10 files... done. The following files will be removed as part of updating to 10.1-RELEASE-p2: / The following files will be updated as part of updating to 10.1-RELEASE-p2: /bin/freebsd-version /usr/lib/private/libunbound.a /usr/lib/private/libunbound.so.5 /usr/lib/private/libunbound_p.a /usr/lib32/libc.a /usr/lib32/libc.so.7 /usr/lib32/libc_p.a /usr/lib32/libc_pic.a /usr/lib32/libmagic.a /usr/lib32/libmagic.so.4 /usr/lib32/libmagic_p.a /usr/lib32/private/libunbound.a /usr/lib32/private/libunbound.so.5 /usr/lib32/private/libunbound_p.a /usr/sbin/unbound [root at seed ~]# freebsd-update install Installing updates...rmdir: ///: Is a directory done. On a consequent reboot and running freebsd-update fetch again [root at seed ~]# freebsd-version 10.1-RELEASE-p2 [root at seed ~]# freebsd-update fetch Looking up update.FreeBSD.org mirrors... none found. Fetching metadata signature for 10.1-RELEASE from update.FreeBSD.org... done. Fetching metadata index... done. Inspecting system... done. Preparing to download files... done. The following files will be removed as part of updating to 10.1-RELEASE-p2: / [root at seed ~]#> On 17 Dec 2014, at 09:36, FreeBSD Security Advisories <security-advisories at freebsd.org> wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > ============================================================================> FreeBSD-SA-14:30.unbound Security Advisory > The FreeBSD Project > > Topic: unbound remote denial of service vulnerability > > Category: contrib > Module: unbound > Announced: 2014-12-17 > Affects: FreeBSD 10.0-RELEASE and later > Credits: Florian Maury (ANSSI) > Corrected: 2014-12-17 06:58:00 UTC (stable/10, 10.1-STABLE) > 2014-12-17 06:59:47 UTC (releng/10.1, 10.1-RELEASE-p2) > 2014-12-17 06:59:47 UTC (releng/10.0, 10.0-RELEASE-p14) > CVE Name: CVE-2014-8602 > > For general information regarding FreeBSD Security Advisories, > including descriptions of the fields above, security branches, and the > following sections, please visit <URL:https://security.FreeBSD.org/>. > > I. Background > > Unbound is a validating, recursive, and caching DNS resolver. > > II. Problem Description > > By causing queries to be made against a maliciously-constructed zone or > against a malicious DNS server, an attacker who is able to cause > specific queries to be sent to a nameserver can trick unbound(8) resolver > into following an endless series of delegations, which consumes a lot of > resources. > > III. Impact > > Unbound will spend a lot of resources on this query, and this will impact > unbound's CPU and network resources. Unbound may therefore lose some > ability or timelines for the service of customer queries (a denial of > service). Unbound will continue to respond normally for cached queries. > > IV. Workaround > > No workaround is available, but hosts not running unbound(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 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. > > [FreeBSD 10.x] > # fetch https://security.FreeBSD.org/patches/SA-14:30/unbound.patch > # fetch https://security.FreeBSD.org/patches/SA-14:30/unbound.patch.asc > # gpg --verify unbound.patch.asc > > b) Apply the patch. Execute the following commands as root: > > # cd /usr/src > # patch < /path/to/patch > > c) Recompile the operating system using buildworld and installworld as > described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. > > Restart the unbound(8) daemons, or reboot the system. > > VI. Correction details > > The following list contains the correction revision numbers for each > affected branch. > > Branch/path Revision > - ------------------------------------------------------------------------- > stable/10/ r275853 > releng/10.0/ r275854 > releng/10.1/ r275854 > - ------------------------------------------------------------------------- > > 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:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> > > VII. References > > <URL:https://unbound.net/downloads/CVE-2014-8602.txt> > > <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8602> > > The latest revision of this advisory is available at > <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-14:30.unbound.asc> > -----BEGIN PGP SIGNATURE----- > > iQIcBAEBCgAGBQJUkTg1AAoJEO1n7NZdz2rn+iUP/3RP0KKn8B2SnSpSLbXws/eY > GEOTYEsZJpGTtCyIg5eKmJ/AU7dKiD34da2uaL41Lt4hWa/Icyk13CtV6cK9TfN4 > oSrrgDCbqErrFh74lhQX3v3bYHNMhZRVnaM9tHXHmpa9NAKhyTP+eyo+Ss7iK/am > lVBW2xPv92OKyjo0Onp5h3o5QT6DHpPgW91f9He4GygYfShMXtOb+VhGpllxwbeM > aS59yPkhGJLVhxQn2QtFpj67QxS5GIhK6iccwrRKo8Okij2mlRfR4fuD5Ol4L9TK > sZKMGtgESPLGmfW1Pj/BRobyCWcs+cYLchZkxbomQBcH7ybpOMW+SqTB0FkZcscU > ODMzvum2VZuSl5fAlu3F6V0/k+8cFiE4B/Xyioqa8aRsfYNfWjoETmfE7ld+zXqX > 8cPizwGYdsuO4g6mNS0HFuuexkJem9qviRfnQUQ/EJQPNfXB33GYBoFquE0mvFUO > WN5QiietSnNp4/TF+BjXlaeo/PtO+Q8xIdqgdSzouslx95a4j3N127k8Yoz55Nx+ > 3mEeqvZRf5/7ieIgyHti/v/xKZOyGCs6NwlZ6xN+0kanNqMDfjpKnfzTJnnSTbj6 > z6FCzXn986EqL8kpJisKZEJfntvZu4ft/KUo4qzZAtuNgnoUGFYXv5DfQrM75ZJ/ > 9PFQzCA+8snPiCyUhAaC > =fkvr > -----END PGP SIGNATURE----- > _______________________________________________ > freebsd-security-notifications at freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-security-notifications > To unsubscribe, send any mail to "freebsd-security-notifications-unsubscribe at freebsd.org"
Dag-Erling Smørgrav
2014-Dec-17 20:48 UTC
FreeBSD Security Advisory FreeBSD-SA-14:30.unbound
Pasi Koivisto <pasi at kanalje.se> writes:> Hi, I am curios why the installer wants to delete "/".This is a (fortunately harmless) bug in freebsd-update. We are looking into it, but for now you can safely ignore it. DES -- Dag-Erling Sm?rgrav - des at des.no