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-----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 iQIVAwUBUSRqt+4yVqjM2NGpAQLXbQ//YAXWk2qEGZ1TCUbmUEejWNY6uah+uHEL D5IEhWvm/x84Xgi5BjbpuxITxrg6mWMCyqGf+3Vo+QYo5VHvXf4C0AKZa144ZJqZ C/WglaUnmC6N/BqR2NUEhC9XMBDsoYaYX6qHuqZu0w5unbm7kH1jOM1oqjPTZ1OX 04+AYDrxt3SFkE5z7DHZBvXdnb5SgjrKdFezAyl6wnoBrZ4LEqBDu22CyBiF6w9J 3F+RzT0HwjMWzNN78xtHBhuwv+72a4TD8G3tnpBvwT4ayqu4mrsxcABVupnLS++P gn0CiPiwGWdaGRwqKSqW444hCzNDmhsD3Jg55JcSvb1QNkBeV/1ph50e+P6waQ3C eGY1li5XmzbybOlH2CyMWZPx2lILdMGXMPxoXO6WXau5iVGZIrrTmT5XcUmQQ81G 0xNkSpq+FGzbEm9hSG4veUVtLRpR1eBnqM1SwgHXYVX3xxNndHZbJRKYAvynmjmx LkU8ViSq/jv5UKr6xRyCIivKDupxlhBetnQPgrZTKSmK2MqDeSs8tIu/Xof2GkL4 vzWG7wtN58/mY/fo9+WfuZ8/tuxgtHfWRVT2lbLhRKt2GO/vy+BPTLdJ1ub1cvYB XWDQmofEcsjhp1HbiKzikl6COAVAkZO67gAD88VTRRhYZkl7byU+XgjxpKlyi4mG RRB3elfItBA= =Othr -----END PGP SIGNATURE-----