An SSRF issue was discovered in Asterisk through 19.x. When using STIR/SHAKEN, its possible to send arbitrary requests (such as GET) to interfaces such as localhost by using the Identity header. This is fixed in 16.25.2, 18.11.2, and 19.3.2.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Asterisk | Digium | 16.15.0 (including) | 16.25.1 (including) |
| Asterisk | Digium | 18.0 (including) | 18.11.2 (excluding) |
| Asterisk | Digium | 19.0.0 (including) | 19.3.1 (including) |
| Asterisk | Ubuntu | bionic | * |
| Asterisk | Ubuntu | impish | * |
| Asterisk | Ubuntu | kinetic | * |
| Asterisk | Ubuntu | lunar | * |
| Asterisk | Ubuntu | mantic | * |
| Asterisk | Ubuntu | trusty | * |
| Asterisk | Ubuntu | upstream | * |
| Asterisk | Ubuntu | xenial | * |