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.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
| Link | Tags |
|---|---|
| https://hackerone.com/reports/1892780 | exploit third party advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/ | mailing list vendor advisory third party advisory |
| https://security.netapp.com/advisory/ntap-20230420-0010/ | third party advisory |
| https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html | mailing list third party advisory |
| https://security.gentoo.org/glsa/202310-12 | third party advisory vendor advisory |