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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.1025 -- [UNIX/Linux] Asterisk: Database matching order permits host-based authentication to be ignored 19 December 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Asterisk Publisher: Asterisk Project Operating System: UNIX variants (UNIX, Linux, OSX) Impact: Inappropriate Access Access: Remote/Unauthenticated CVE Names: CVE-2007-6430 Original Bulletin: http://downloads.digium.com/pub/security/AST-2007-027.html - --------------------------BEGIN INCLUDED TEXT-------------------- Asterisk Project Security Advisory - AST-2007-027 +------------------------------------------------------------------------+ | Product | Asterisk | |--------------------+---------------------------------------------------| | Summary | Database matching order permits host-based | | | authentication to be ignored | |--------------------+---------------------------------------------------| | Nature of Advisory | Logic error | |--------------------+---------------------------------------------------| | Susceptibility | Remote Unauthenticated Sessions | |--------------------+---------------------------------------------------| | Severity | Moderate | |--------------------+---------------------------------------------------| | Exploits Known | No | |--------------------+---------------------------------------------------| | Reported On | October 30, 2007 | |--------------------+---------------------------------------------------| | Reported By | Tilghman Lesher <tlesher AT digium DOT com> | |--------------------+---------------------------------------------------| | Posted On | December 18, 2007 | |--------------------+---------------------------------------------------| | Last Updated On | December 18, 2007 | |--------------------+---------------------------------------------------| | Advisory Contact | Tilghman Lesher <tlesher AT digium DOT com> | |--------------------+---------------------------------------------------| | CVE Name | CVE-2007-6430 | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Description | Due to the way database-based registrations ("realtime") | | | are processed, IP addresses are not checked when the | | | username is correct and there is no password. An | | | attacker may impersonate any user using host-based | | | authentication without a secret, simply by guessing the | | | username of that user. This is limited in scope to | | | administrators who have set up the registration database | | | ("realtime") for authentication and are using only | | | host-based authentication, not passwords. However, both | | | the SIP and IAX protocols are affected. | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Resolution | As a workaround, administrators may set a password for | | | all users and peers in their registration "realtime" | | | database. A fix is included in the newest release of | | | Asterisk, as provided below. | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Affected Versions | |------------------------------------------------------------------------| | Product | Release | | | | Series | | |----------------------------+-------------+-----------------------------| | Asterisk Open Source | 1.0.x | Not affected | |----------------------------+-------------+-----------------------------| | Asterisk Open Source | 1.2.x | All versions prior to | | | | 1.2.26 | |----------------------------+-------------+-----------------------------| | Asterisk Open Source | 1.4.x | All versions prior to | | | | 1.4.16 | |----------------------------+-------------+-----------------------------| | Asterisk Business Edition | A.x.x | Not affected | |----------------------------+-------------+-----------------------------| | Asterisk Business Edition | B.x.x | All versions prior to | | | | B.2.3.6 | |----------------------------+-------------+-----------------------------| | Asterisk Business Edition | C.x.x | All versions prior to | | | | C.1.0-beta8 | |----------------------------+-------------+-----------------------------| | AsteriskNOW | pre-release | Not affected | |----------------------------+-------------+-----------------------------| | Asterisk Appliance | 0.x.x | Not affected | | Developer Kit | | | |----------------------------+-------------+-----------------------------| | s800i (Asterisk Appliance) | 1.0.x | Not affected | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Corrected In | |------------------------------------------------------------------------| | Product | Release | |-------------------------------------------+----------------------------| | Asterisk Open Source | 1.2.26 | |-------------------------------------------+----------------------------| | Asterisk Open Source | 1.4.16 | |-------------------------------------------+----------------------------| | Asterisk Business Edition | B.2.3.6 | |-------------------------------------------+----------------------------| | Asterisk Business Edition | C.1.0-beta8 | |-------------------------------------------+----------------------------| +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Links | | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Asterisk Project Security Advisories are posted at | | http://www.asterisk.org/security | | | | This document may be superseded by later versions; if so, the latest | | version will be posted at | | http://downloads.digium.com/pub/security/AST-2007-027.pdf and | | http://downloads.digium.com/pub/security/AST-2007-027.html | +------------------------------------------------------------------------+ +------------------------------------------------------------------------+ | Revision History | |------------------------------------------------------------------------| | Date | Editor | Revisions Made | |-----------------+------------------------+-----------------------------| | 2007-12-18 | Tilghman Lesher | Initial Release | +------------------------------------------------------------------------+ Asterisk Project Security Advisory - AST-2007-027 Copyright (c) 2007 Digium, Inc. All Rights Reserved. Permission is hereby granted to distribute and publish this advisory in its original, unaltered form. - --------------------------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. 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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 iQCVAwUBR2idgih9+71yA2DNAQKCuwP/fMjfmAcBCIKR1us5LnPtfdzPOSqaVAem IdbzaSZXnal6GWfkosrIODXsqvdinan8pGGYwOpy7CDovQ4o/u+DQH57nYbCVVmZ AWjf/NbJR2U9zOrJrJz1cxzzNu6SBfWLbnw7wUfqSicS00bGeHirDx69HadI2UI0 s/KuKI6Lz8I= =MODP -----END PGP SIGNATURE-----