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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0673 -- [UNIX/Linux][Debian] DNS vulnerability impact on the libc stub resolver 9 July 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: glibc Publisher: Debian Operating System: Debian GNU/Linux 4.0 UNIX variants (UNIX, Linux, OSX) Impact: Provide Misleading Information Access: Remote/Unauthenticated CVE Names: CVE-2008-1447 Ref: AL-2008.0080 ESB-2008.0672 Original Bulletin: http://www.debian.org/security/2008/dsa-1605 Comment: This advisory references vulnerabilities in products which run on platforms other than Debian. It is recommended that administrators running glibc check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - - ------------------------------------------------------------------------ Debian Security Advisory DSA-1605-1 security@debian.org http://www.debian.org/security/ Florian Weimer July 08, 2008 http://www.debian.org/security/faq - - ------------------------------------------------------------------------ Package : glibc Vulnerability : DNS cache poisoning Problem type : remote Debian-specific: no CVE Id(s) : CVE-2008-1447 CERT advisory : VU#800113 Dan Kaminsky discovered that properties inherent to the DNS protocol lead to practical DNS spoofing and cache poisoning attacks. Among other things, successful attacks can lead to misdirected web traffic and email rerouting. At this time, it is not possible to implement the recommended countermeasures in the GNU libc stub resolver. The following workarounds are available: 1. Install a local BIND 9 resoler on the host, possibly in forward-only mode. BIND 9 will then use source port randomization when sending queries over the network. (Other caching resolvers can be used instead.) 2. Rely on IP address spoofing protection if available. Successful attacks must spoof the address of one of the resolvers, which may not be possible if the network is guarded properly against IP spoofing attacks (both from internal and external sources). This DSA will be updated when patches for hardening the stub resolver are available. - - --------------------------------------------------------------------------------- For apt-get: deb http://security.debian.org/ stable/updates main For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main Mailing list: debian-security-announce@lists.debian.org Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg> - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iQEVAwUBSHOIFr97/wQC1SS+AQIscwf+KBKMT4hcpB5TCNE+0v1DNBHiQ4rh7ktz KiOyLWEJOaxOrpsR8siA6B6newiLe5KfwojDikqSCXbubTCeicj79HTCx5DzzhTm aa3HePARxmtN1AuyFCebOfklibTtyY/gpwydCdAVBiV0+LmD+jXy9Jx4AfyuibXZ VaqkUTj5sUUQn5CacdI1zc1Ky1rzbzRBBoNJ1D1rRBU1wjoGsvVjBV9p24j/1E2c mYtbY3g1FKmhnOTLBac/AAW62ZQ44yf4QcGgwV8CULfi5c2QmGiRYZioWDVd0pfZ hr2h/Vmjs2qgf8B9FmYet0hEGm6SrEryT2ievlqXkpul0MYtHjJ5iw== =CMHb - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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 iQCVAwUBSHQBACh9+71yA2DNAQLCgwP/XVOtbYfzWX0RLgyvVshfIxTzRHbUslGO qYpKDprce6aNhSBJL/moV70YOvD79of3NdpL/up8hRqrL05KL+piJ75w7nSyBEbU IoglxVfXvfb1kmHB27vEQJWdYAfBuRxwY+ZxWJV3W9TDiQLqhg/j+YYp7Hp2WtUk XL1krCAfCfY= =sM0y -----END PGP SIGNATURE-----