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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.1109 Insufficient message length validation for EAP-TLS messages 23 November 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: hostapd Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2012-4445 Reference: ESB-2012.0959 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-12:07.hostapd.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-12:07.hostapd Security Advisory The FreeBSD Project Topic: Insufficient message length validation for EAP-TLS messages Category: contrib Module: wpa Announced: 2012-11-22 Credits: Timo Warns, Jouni Malinen Affects: FreeBSD 8.0 and later. Corrected: 2012-11-22 22:52:15 UTC (RELENG_8, 8.3-STABLE) 2012-11-22 22:52:15 UTC (RELENG_8_3, 8.3-RELEASE-p5) 2012-11-22 22:52:15 UTC (RELENG_9, 9.1-PRERELEASE) 2012-11-22 22:52:15 UTC (RELENG_9_0, 9.0-RELEASE-p5) 2012-11-22 22:52:15 UTC (RELENG_9_1, 9.1-RC1-p1) 2012-11-22 22:52:15 UTC (RELENG_9_1, 9.1-RC2-p1) 2012-11-22 22:52:15 UTC (RELENG_9_1, 9.1-RC3-p1) CVE Name: CVE-2012-4445 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 hostapd utility is an authenticator for IEEE 802.11 networks. It provides full support for WPA/IEEE 802.11i and can also act as an IEEE 802.1X Authenticator with a suitable backend Authentication Server (typically FreeRADIUS). EAP-TLS is the original, standard wireless LAN EAP authentication protocol defined in RFC 5216. It uses PKI to secure communication to a RADIUS authentication server or another type of authentication server. II. Problem Description The internal authentication server of hostapd does not sufficiently validate the message length field of EAP-TLS messages. III. Impact A remote attacker could cause the hostapd daemon to abort by sending specially crafted EAP-TLS messages, resulting in a Denial of Service. IV. Workaround No workaround is available, but systems not running hostapd are not vulnerable. Note that for FreeBSD 8.x systems, the EAP-TLS authentication method is not enabled by default. Systems running FreeBSD 8.x are only affected when hostapd is built with -DEAP_SERVER and as such, binary installations from the official release are not affected. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 8-STABLE or 9-STABLE, or to the RELENG_8_3, or RELENG_9_0 security branch 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 FreeBSD 8.3 and 9.0 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 8.x] # fetch http://security.FreeBSD.org/patches/SA-12:07/hostapd-8.patch # fetch http://security.FreeBSD.org/patches/SA-12:07/hostapd-8.patch.asc [FreeBSD 9.x] # fetch http://security.FreeBSD.org/patches/SA-12:07/hostapd.patch # fetch http://security.FreeBSD.org/patches/SA-12:07/hostapd.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>. 3) To update your vulnerable system via a binary patch: Systems running 8.3-RELEASE, 9.0-RELEASE, 9.1-RC1, 9.1-RC2, or 9.1-RC3 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 revision numbers of each file that was corrected in FreeBSD. Subversion: Branch/path Revision - - ------------------------------------------------------------------------- stable/8/ r<revision> releng/8.3/ r<revision> stable/9/ r<revision> releng/9.0/ r<revision> releng/9.1/ r<revision> - - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-4445 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-12:07.hostapd.asc - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 iEYEARECAAYFAlCuu28ACgkQFdaIBMps37JpRwCfVJmZsx+mAF22hqtL3YvcGU2x g9IAoIUfP/8eJjQACi30QVdvjFtGDw7f =SJZf - -----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 iQIVAwUBUK7JUO4yVqjM2NGpAQKexg//fxA73h0EDk176KXUFZpjTExE5ww3LIR0 qkaN10LwFVq+uLCJRQtuCVk1S5HXp2PfdBhHTaBE/Bstz+b8GCb+tVSkSwQ4HWro /o4DUu+aSp8T7yYUTVSuNFeDoeG4rxWqr6coBHajzkSz7FU20MnssPRbLGTyEs+8 zK/WU7C5qZJe91Ld61eHWT2P2fgu+QeD3R1czPLyCZ0e83btlGY3weJ6lx7bv4gy yC4EcNvgm2mjOlvmZZA1DjUO/C0w2pte/BeBnY5WdqhZ1QdnT0ZCmsMb//hMqmAB 6DeFeLEEsRJliY63T5TW+fNKvrPIiXeS5kqcd23WvNNLLUslxjYPqnHi0pFOTMvb jHedILcQNxhzW2VQhwcWAcbR5tkC/YyxT9pv6tMRRzEMmb9Fe/N0GykhEgo3Fw7T qpekCXTiVNwCwxiv0LB4+vNJCyXORDYfx/3VOwPD2iChIticY867kZWiyFWMudzO f7YDteUULd7fip6YmXiKybWx+E8QeSLRg5u3mX4NLu7FITo4fMFU10w+yRyfrzGz xtx07Rl5SzbQPzDsXPwxE/DmzJTI0YI8u0Vh1I1mW/h7W/91SM8R9VpUQEZp93kC Lt+COYS31B7XbCVASSJp1KtOqRI9F9A3lz8KNmqya8dokHqeTKS/DR8jipM7+vYj y+u05I9mW+o= =rogS -----END PGP SIGNATURE-----