Description
Asterisk Open Source 1.2.x before 1.2.32, 1.4.x before 1.4.24.1, and 1.6.0.x before 1.6.0.8; Asterisk Business Edition A.x.x, B.x.x before B.2.5.8, C.1.x.x before C.1.10.5, and C.2.x.x before C.2.3.3; s800i 1.3.x before 1.3.0.2; and Trixbox PBX 2.6.1, when Digest authentication and authalwaysreject are enabled, generates different responses depending on whether a SIP username is valid, which allows remote attackers to enumerate valid usernames.
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 | 1:1.6.1.0~dfsg-1 | — |
| Debian 5.0 | asterisk | 1:1.4.21.2~dfsg-3+lenny1 | DSA-1952-1 |
Advisories 1
- DSA-1952-1 asterisk - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- GLSA-200905-01 vendor-advisory
- http://downloads.asterisk.org/pub/security/AST-2009-003.html
- 34353 vdb-entry
- 37677 third-party-advisory
- DSA-1952 vendor-advisory
- http://misel.com/?p=52
- asterisk-username-info-disclosure(45059) vdb-entry
- ADV-2009-0933 vdb-entry
- 34982 third-party-advisory