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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0053 -- [FreeBSD] libc inet_network() buffer overflow 15 January 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: libc Publisher: FreeBSD Operating System: FreeBSD Impact: Denial of Service Execute Arbitrary Code/Commands Access: Remote/Unauthenticated CVE Names: CVE-2008-0122 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-08:02.libc.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-08:02.libc Security Advisory The FreeBSD Project Topic: inet_network() buffer overflow Category: core Module: libc Announced: 2008-01-14 Credits: Bjoern A. Zeeb and Nate Eldredge Affects: FreeBSD 6.2 Corrected: 2008-01-14 22:57:45 UTC (RELENG_7, 7.0-PRERELEASE) 2008-01-14 22:55:54 UTC (RELENG_7_0, 7.0-RC2) 2008-01-14 22:56:05 UTC (RELENG_6, 6.3-PRERELEASE) 2008-01-14 22:56:18 UTC (RELENG_6_3, 6.3-RELEASE) 2008-01-14 22:56:44 UTC (RELENG_6_2, 6.2-RELEASE-p10) CVE Name: CVE-2008-0122 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 resolver is the part of libc that resolves hostnames (example.com) to internet protocol (IP) addresses (192.0.2.1) and vice versa. The inet_network() function returns an in_addr_t representing the network address of the IP address given to inet_network() as a character string in the dot-notation. II. Problem Description An off-by-one error in the inet_network() function could lead to memory corruption with certain inputs. III. Impact For programs which passes untrusted data to inet_network(), an attacker may be able to overwrite a region of memory with user defined data by causing specially crafted input to be passed to inet_network(). Depending on the region of memory the attacker is able to overwrite, this might lead to a denial of service or potentially code execution in the program using inet_network(). IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 7.0-PRERELEASE, or 6-STABLE, or to the, RELENG_7_0, RELENG_6_3, or RELENG_6_2 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 7.0, 6.3, or 6.2 systems. 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-08:02/libc.patch # fetch http://security.FreeBSD.org/patches/SA-08:02/libc.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system as described in <URL: http://www.freebsd.org/handbook/makeworld.html> and reboot the system. VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision Path - - ------------------------------------------------------------------------- RELENG_6 src/lib/libc/inet/inet_network.c 1.2.2.2 RELENG_6_3 src/UPDATING 1.416.2.37.2.3 src/sys/conf/newvers.sh 1.69.2.15.2.3 src/lib/libc/inet/inet_network.c 1.2.2.1.4.1 RELENG_6_2 src/UPDATING 1.416.2.29.2.13 src/sys/conf/newvers.sh 1.69.2.13.2.13 src/lib/libc/inet/inet_network.c 1.2.2.1.2.1 RELENG_7 src/lib/libc/inet/inet_network.c 1.4.2.1 RELENG_7_0 src/UPDATING 1.507.2.3.2.1 src/sys/conf/newvers.sh 1.72.2.5.2.2 src/lib/libc/inet/inet_network.c 1.4.4.1 - - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0122 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-08:02.libc.asc - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHi+ntFdaIBMps37IRAr+GAJ9YxPIsD5OeyYkrwo5auWKgQwZRywCdHSrY NsNxcHsgdo7divn+LEkQ9po= =3RQQ - -----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 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== 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 iQCVAwUBR4wMmih9+71yA2DNAQIsmwP/Q6JhqtK3rDE23GdbOuozRYth1N321jym lLQuE9wK+i7d3wjaOXP6ptKuz39wwZ9Z34ikmC4ISaWYdCMZUAbqIt4pNtOXrXkH ZDl7DgDIZJRB8IBkNgoX7fE/VzoZCpp73TCZeXS4Pw1sPc3M3T5pMZpEzxF7EfK0 79mCCQTvQ0c= =GMwG -----END PGP SIGNATURE-----