Asterisk Project Security Advisory - 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.
8f347c1af72c018f03b4107767873c60b519061e85f1fa9739ca188fc9633316 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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