Description
The IAX2 channel driver (chan_iax2) for Asterisk 1.2.x before 1.2.9 and 1.0.x before 1.0.11 allows remote attackers to cause a denial of service (crash) and execute arbitrary code via truncated IAX 2 (IAX2) video frames, which bypasses a length check and leads to a buffer overflow involving negative length check. NOTE: the vendor advisory claims that only a DoS is possible, but the original researcher is reliable.
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 | 1:1.2.10.dfsg-2 | — |
| Debian 13 | iaxmodem | 0.1.8.dfsg-2 | — |
| Debian 12 | iaxmodem | 0.1.8.dfsg-2 | — |
| Debian 3.1 | asterisk | 1:1.0.7.dfsg.1-2sarge3 | DSA-1126 |
Advisories 1
- DSA-1126 asterisk - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- 1016236 vdb-entry
- DSA-1126 vendor-advisory
- 20899 third-party-advisory
- 20658 third-party-advisory
- asterisk-iax2-videoframe-bo(27045) vdb-entry
- 21222 third-party-advisory
- http://www.asterisk.org/node/95
- GLSA-200606-15 vendor-advisory
- 18295 vdb-entry
- 20497 third-party-advisory
- 20060606 Asterisk 1.2.9 and Asterisk 1.0.11 Released - Security Fix mailing-list
- ADV-2006-2181 vdb-entry
- SUSE-SR:2006:015 vendor-advisory
- 20060609 CORE-2006-0330: Asterisk PBX truncated video frame vulnerability mailing-list