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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2009.0042 -- [UNIX/Linux] pdnsd: Denial of Service and cache poisoning 13 January 2009 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: pdnsd Publisher: Gentoo Operating System: Gentoo UNIX variants (UNIX, Linux, OSX) Impact: Denial of Service Provide Misleading Information Access: Remote/Unauthenticated CVE Names: CVE-2008-4194 CVE-2008-1447 Original Bulletin: http://security.gentoo.org/glsa/glsa-200901-03.xml - --------------------------BEGIN INCLUDED TEXT-------------------- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200901-03 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: pdnsd: Denial of Service and cache poisoning Date: January 11, 2009 Bugs: #231285 ID: 200901-03 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Two errors in pdnsd allow for Denial of Service and cache poisoning. Background ========== pdnsd is a proxy DNS server with permanent caching that is designed to cope with unreachable DNS servers. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/pdnsd < 1.2.7 >= 1.2.7 Description =========== Two issues have been reported in pdnsd: * The p_exec_query() function in src/dns_query.c does not properly handle many entries in the answer section of a DNS reply, related to a "dangling pointer bug" (CVE-2008-4194). * The default value for query_port_start was set to 0, disabling UDP source port randomization for outgoing queries (CVE-2008-1447). Impact ====== An attacker could exploit the second weakness to poison the cache of pdnsd and thus spoof DNS traffic, which could e.g. lead to the redirection of web or mail traffic to malicious sites. The first issue can be exploited by enticing pdnsd to send a query to a malicious DNS server, or using the port randomization weakness, and might lead to a Denial of Service. Workaround ========== Port randomization can be enabled by setting the "query_port_start" option to 1024 which would resolve the CVE-2008-1447 issue. Resolution ========== All pdnsd users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/pdnsd-1.2.7" References ========== [ 1 ] CVE-2008-1447 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1447 [ 2 ] CVE-2008-4194 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4194 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200901-03.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2009 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5 - --------------------------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 iQCVAwUBSWvV1yh9+71yA2DNAQJlKQP9ELC/d+Dvqoe+a855lH4zrSDjBlSowTH4 ULiRtoAH15wFT0yFy0Mv4YtdtJwz0mxyRki7n20EzGbY3n83k1Fu0Jq4luwKjr6t 8Hrvk0MXSIULVe8KzWyRm4KaOdO5FprALCTgEnS0I74VmHd+aXHqu0nK0AMGfWiK kddKYLCYXsM= =m3t5 -----END PGP SIGNATURE-----