Description
channels/chan_sip.c in Asterisk Open Source 1.8.x before 1.8.13.1 and 10.x before 10.5.2, Asterisk Business Edition C.3.x before C.3.7.5, Certified Asterisk 1.8.11-certx before 1.8.11-cert4, and Asterisk Digiumphones 10.x.x-digiumphones before 10.5.2-digiumphones does not properly handle a provisional response to a SIP reINVITE request, which allows remote authenticated users to cause a denial of service (RTP port exhaustion) via sessions that lack final responses.
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 | 1:1.8.13.1~dfsg-1 | — |
| Debian 6.0 | asterisk | 1:1.6.2.9-2+squeeze7 | DSA-2550-1 |
Advisories 1
- DSA-2550-1 asterisk - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- 50687 third-party-advisory
- 50756 third-party-advisory
- DSA-2550 vendor-advisory
- 54327 vdb-entry
- http://downloads.asterisk.org/pub/security/AST-2012-010.html
- https://issues.asterisk.org/jira/browse/ASTERISK-19992