Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2013.0223
glob(3) related resource exhaustion
20 February 2013
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: libc
Publisher: FreeBSD
Operating System: FreeBSD
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2010-2632
Reference: ESB-2011.0667
Original Bulletin:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-13:02.libc.asc
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
=============================================================================
FreeBSD-SA-13:02.libc Security Advisory
The FreeBSD Project
Topic: glob(3) related resource exhaustion
Category: core
Module: libc
Announced: 2013-02-19
Affects: All supported versions of FreeBSD.
Corrected: 2013-02-05 09:53:32 UTC (stable/7, 7.4-STABLE)
2013-02-19 13:27:20 UTC (releng/7.4, 7.4-RELEASE-p12)
2013-02-05 09:53:32 UTC (stable/8, 8.3-STABLE)
2013-02-19 13:27:20 UTC (releng/8.3, 8.3-RELEASE-p6)
2013-02-05 09:53:32 UTC (stable/9, 9.1-STABLE)
2013-02-19 13:27:20 UTC (releng/9.0, 9.0-RELEASE-p6)
2013-02-19 13:27:20 UTC (releng/9.1, 9.1-RELEASE-p1)
CVE Name: CVE-2010-2632
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 glob(3) function is a pathname generator that implements the rules for
file name pattern matching used by the shell.
II. Problem Description
GLOB_LIMIT is supposed to limit the number of paths to prevent against
memory or CPU attacks. The implementation however is insufficient.
III. Impact
An attacker that is able to exploit this vulnerability could cause excessive
memory or CPU usage, resulting in a Denial of Service. A common target for
a remote attacker could be ftpd(8).
IV. Workaround
No workaround is available.
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-13:02/libc.patch
# fetch http://security.FreeBSD.org/patches/SA-13:02/libc.patch.asc
# gpg --verify libc.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 all 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
Restart all daemons, or reboot the system.
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Branch/path Revision
- - -------------------------------------------------------------------------
stable/7/ r246357
releng/7.4/ r246989
stable/8/ r246357
releng/8.3/ r246989
stable/9/ r246357
releng/9.0/ r246989
releng/9.1/ r246989
- - -------------------------------------------------------------------------
VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2632
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-13:02.libc.asc
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (FreeBSD)
iEYEARECAAYFAlEjf80ACgkQFdaIBMps37JFUgCfUrw8Ky4U19COja6fna49Calv
z/YAn1JSGxzHCo8vLj4XhtXqrQt68or4
=mCPv
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=Othr
-----END PGP SIGNATURE-----