Description
An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. A SIP request can be sent to Asterisk that can change a SIP peer's IP address. A REGISTER does not need to occur, and calls can be hijacked as a result. The only thing that needs to be known is the peer's name; authentication details such as passwords do not need to be known. This vulnerability is only exploitable when the nat option is set to the default, or auto_force_rport.
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 | 1:16.10.0~dfsg-1 | — |
| Debian 9 | asterisk | 1:13.14.1~dfsg-2+deb9u6 | DLA-2969-1 |
| Debian 8 | asterisk | 1:11.13.1~dfsg-2+deb8u7 | DLA-2017-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | asterisk | No fix yet | — |
| Ubuntu 18.04 LTS | asterisk | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | asterisk | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | asterisk | 16.6.2-r0 | — |
| Alpine v3.23 | asterisk | 16.6.2-r0 | — |
| Alpine v3.22 | asterisk | 16.6.2-r0 | — |
| Alpine v3.21 | asterisk | 16.6.2-r0 | — |
| Alpine v3.20 | asterisk | 16.6.2-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | asterisk | 16.6.2-r0 | — |
| Alpine v3.18 | asterisk | 16.6.2-r0 | — |
| Alpine v3.17 | asterisk | 16.6.2-r0 | — |
| Alpine v3.16 | asterisk | 16.6.2-r0 | — |
| Alpine v3.15 | asterisk | 16.6.2-r0 | — |
| Alpine v3.14 | asterisk | 16.6.2-r0 | — |
| Alpine v3.13 | asterisk | 16.6.2-r0 | — |
| Alpine v3.12 | asterisk | 16.6.2-r0 | — |
| Alpine v3.11 | asterisk | 16.6.2-r0 | — |
| Alpine v3.10 | asterisk | 16.3.0-r3 | — |
Advisories 2
- DLA-2969-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2017-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://www.asterisk.org/downloads/security-advisories
- http://downloads.asterisk.org/pub/security/AST-2019-006.html
- [debian-lts-announce] 20191130 [SECURITY] [DLA 2017-1] asterisk security update mailing-list
- [debian-lts-announce] 20220403 [SECURITY] [DLA 2969-1] asterisk security update mailing-list