An issue was discovered in wolfSSL before 4.5.0. It mishandles the change_cipher_spec (CCS) message processing logic for TLS 1.3. If an attacker sends ChangeCipherSpec messages in a crafted way involving more than one in a row, the server becomes stuck in the ProcessReply() loop, i.e., a denial of service.
Weakness
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Wolfssl | Wolfssl | * | 4.5.0 (excluding) |
| Wolfssl | Ubuntu | bionic | * |
| Wolfssl | Ubuntu | esm-apps/bionic | * |
| Wolfssl | Ubuntu | esm-apps/focal | * |
| Wolfssl | Ubuntu | esm-apps/xenial | * |
| Wolfssl | Ubuntu | focal | * |
| Wolfssl | Ubuntu | trusty | * |
| Wolfssl | Ubuntu | upstream | * |
| Wolfssl | Ubuntu | xenial | * |