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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0368 -- [Debian] New pdns-recursor packages fix cache poisoning vulnerability 17 July 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: pdns-recursor Publisher: Debian Operating System: Debian GNU/Linux 4.0 Impact: Provide Misleading Information Access: Remote/Unauthenticated CVE Names: CVE-2008-1637 Ref: AA-2008.0075 Original Bulletin: http://www.debian.org/security/2008/dsa-1544 Revision History: July 17 2008: Debian released a revision April 10 2008: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - - ------------------------------------------------------------------------ Debian Security Advisory DSA-1544-2 security@debian.org http://www.debian.org/security/ Florian Weimer July 16, 2008 http://www.debian.org/security/faq - - ------------------------------------------------------------------------ Package : pdns-recursor Vulnerability : insufficient randomness Problem type : remote Debian-specific: no CVE Id(s) : CVE-2008-1637 Debian Bug : 490069 Thomas Biege discovered that the upstream fix for the weak random number generator released in DSA-1544-1 was incomplete: Source port randomization did still not use difficult-to-predict random numbers. This is corrected in this security update. Here is the text of the original advisory: Amit Klein discovered that pdns-recursor, a caching DNS resolver, uses a weak random number generator to create DNS transaction IDs and UDP source port numbers. As a result, cache poisoning attacks were simplified. (CVE-2008-1637) In the light of recent DNS-related developments (documented in DSAs 1603, 1604, 1605), we recommend that this update is installed as an additional safety measure. (The lack of source port randomization was addressed in the 3.1.6 upstream version.) In addition, this update incorporates the changed IP address of L.ROOT-SERVERS.NET. For the stable distribution (etch), this problem has been fixed in version 3.1.4-1+etch2. For the unstable distribution (sid), this problem has been fixed in version 3.1.7-1. We recommend that you upgrade your pdns-recursor package. Upgrade instructions - - -------------------- wget url will fetch the file for you dpkg -i file.deb will install the referenced file. If you are using the apt-get package manager, use the line for sources.list as given below: apt-get update will update the internal database apt-get upgrade will install corrected packages You may use an automated update by adding the resources from the footer to the proper configuration. Debian GNU/Linux 4.0 alias etch - - ------------------------------- Source archives: http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2.diff.gz Size/MD5 checksum: 34915 0d67af6859a24778f87137fb159b19d6 http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4.orig.tar.gz Size/MD5 checksum: 171270 e35d774e3282285a59a7f8038a036b61 http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2.dsc Size/MD5 checksum: 1198 264388cc310a18ffcede810e510d26dc alpha architecture (DEC Alpha) http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_alpha.deb Size/MD5 checksum: 499184 d975957b892261bef540029738fbc816 amd64 architecture (AMD x86_64 (AMD64)) http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_amd64.deb Size/MD5 checksum: 418498 f5c48c3dfa05a888c38416b7c3b1e9ee i386 architecture (Intel ia32) http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_i386.deb Size/MD5 checksum: 433786 33e5e4d147b1f7408dee93f014845e4b ia64 architecture (Intel ia64) http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_ia64.deb Size/MD5 checksum: 598166 f1b98150ec6cb205eb10d5dcc69f1684 powerpc architecture (PowerPC) http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_powerpc.deb Size/MD5 checksum: 434308 4d9376157024a98cb3217f884c74f42f s390 architecture (IBM S/390) http://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_s390.deb Size/MD5 checksum: 408966 87930fd404bbab5c43332711511fedc7 These files will probably be moved into the stable distribution on its next update. - - --------------------------------------------------------------------------------- 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) iQEVAwUBSH5Hkb97/wQC1SS+AQJ6QQgAk3Hg55B7DJJLC/FbiMUbeXuJbLisseM/ IumLee3gupKCSBzQkbvDREk0gnvKrYpp7sjHIhMXLrPlZsfBSpOpw84dsz4f8pEi Zj7NelaNojnoTWSoZLscLNEjoOaWzLB4xn+SbVcgGdrmXDACyVbQC69S6LucsLVq EwG9Pu+FfJLyx2ypi0VpqLHLzWr5DBklgRIWKuTRQWfe8v9LgQ6t25PAHISwEALi z3G+aGSMi/6VCummd1WTRjKIgmiwQfSOiHKf6zNPDK+favFxSgqRIbgibZqortHR U13gYsToh5lAuzA6r3xOau5ksDHp0JWs9zLJp10Rs4U0c/M4bRT9Ig== =anyp - -----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 iQCVAwUBSH6iaSh9+71yA2DNAQJeKwP+OU5d9u0NL+JxeKMOgFJoJwutSTHP40fz Os7iWbX2sRntuLvRFjH4HLcjN4IKbFCVdXPgSj7D5ppHXnZQ3KDTS8r8+tGOwitW +uKx4OPDIYgGtFPh8oHqGE7EbQulLGZt95Xkgq3WE2Pj3hBT4/jdINwAkh3j4NFc Na1ZUGdY0h8= =Bzk5 -----END PGP SIGNATURE-----