An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not included in the configuration match checks, causing them to match too easily. This could lead to libcurl using the wrong credentials when performing a transfer, potentially allowing unauthorized access to sensitive information.
The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libcurl | Haxx | 7.13.0 (including) | 7.88.1 (including) |
| Red Hat Enterprise Linux 8 | RedHat | curl-0:7.61.1-30.el8_8.2 | * |
| Red Hat Enterprise Linux 8.6 Extended Update Support | RedHat | curl-0:7.61.1-22.el8_6.12 | * |
| Red Hat Enterprise Linux 9 | RedHat | curl-0:7.76.1-23.el9_2.1 | * |
| Red Hat Enterprise Linux 9 | RedHat | curl-0:7.76.1-23.el9_2.1 | * |
| Curl | Ubuntu | bionic | * |
| Curl | Ubuntu | esm-infra/xenial | * |
| Curl | Ubuntu | focal | * |
| Curl | Ubuntu | jammy | * |
| Curl | Ubuntu | kinetic | * |
| Curl | Ubuntu | lunar | * |
| Curl | Ubuntu | trusty | * |
| Curl | Ubuntu | trusty/esm | * |
| Curl | Ubuntu | upstream | * |
| Curl | Ubuntu | xenial | * |