Description
The SIP channel driver (channels/chan_sip.c) in Asterisk Open Source 1.8.17.x through 1.8.22.x, 1.8.23.x before 1.8.23.1, and 11.x before 11.5.1 and Certified Asterisk 1.8.15 before 1.8.15-cert3 and 11.2 before 11.2-cert2 allows remote attackers to cause a denial of service (NULL pointer dereference, segmentation fault, and daemon crash) via an ACK with SDP to a previously terminated channel. NOTE: some of these details are obtained from third party information.
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 | 1:11.5.1~dfsg-1 | — |
| Debian 7 | asterisk | 1:1.8.13.1~dfsg-3+deb7u1 | DSA-2749-1 |
| Debian 6.0 | asterisk | 1:1.6.2.9-2+squeeze11 | DSA-2749-1 |
Advisories 1
- DSA-2749-1 asterisk - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- 54534 third-party-advisory
- 96691 vdb-entry
- 20130827 AST-2013-004: Remote Crash From Late Arriving SIP ACK With SDP mailing-list
- 54617 third-party-advisory
- DSA-2749 vendor-advisory
- 20130827 AST-2013-004: Remote Crash From Late Arriving SIP ACK With SDP mailing-list
- http://downloads.asterisk.org/pub/security/AST-2013-004.html
- 62021 vdb-entry
- 1028956 vdb-entry
- https://issues.asterisk.org/jira/browse/ASTERISK-21064
- MDVSA-2013:223 vendor-advisory