Asterisk is an open source private branch exchange and telephony toolkit. In versions up to and including 18.26.2, between 20.00.0 and 20.15.0, 20.7-cert6, 21.00.0, 22.00.0 through 22.5.0, there is a remote DoS and possible RCE condition in asterisk/res/res_stir_shaken /verification.c that can be exploited when an attacker can set an arbitrary Identity header, or STIR/SHAKEN is enabled, with verification set in the SIP profile associated with the endpoint to be attacked. This is fixed in versions 18.26.3, 20.7-cert6, 20.15.1, 21.10.1 and 22.5.1.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Asterisk | Sangoma | * | 18.26.3 (excluding) |
| Asterisk | Sangoma | 20.0.0 (including) | 20.15.1 (excluding) |
| Asterisk | Sangoma | 21.0.0 (including) | 21.10.1 (excluding) |
| Asterisk | Sangoma | 22.0.0 (including) | 22.5.1 (excluding) |
| Asterisk | Ubuntu | plucky | * |
| Asterisk | Ubuntu | upstream | * |