Database matching order permits host-based authentication to be ignored

2007.12.20
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-287


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

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.


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