Description
Asterisk Open Source 1.2.x before 1.2.26 and 1.4.x before 1.4.16, and Business Edition B.x.x before B.2.3.6 and C.x.x before C.1.0-beta8, when using database-based registrations ("realtime") and host-based authentication, does not check the IP address when the username is correct and there is no password, which allows remote attackers to bypass authentication using a valid username.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | asterisk | 1:1.4.16.2~dfsg-1 | — |
| Debian 4.0 | asterisk | 1:1.2.13~dfsg-2etch3 | DSA-1525-1 |
Advisories 1
- DSA-1525-1 asterisk Debian Security (DSA / DLA) · Mar 9, 2026
References
- 28149 third-party-advisory
- 29782 third-party-advisory
- GLSA-200804-13 vendor-advisory
- 29242 third-party-advisory
- 20071218 AST-2007-027 - Database matching order permits host-based authentication to be ignored mailing-list
- SUSE-SR:2008:005 vendor-advisory
- ADV-2007-4260 vdb-entry
- DSA-1525 vendor-advisory
- 3467 third-party-advisory
- 39519 vdb-entry
- 1019110 vdb-entry
- asterisk-registration-security-bypass(39124) vdb-entry
- 29456 third-party-advisory
- 26928 vdb-entry
- http://downloads.digium.com/pub/security/AST-2007-027.html