CVE-2023-27538

Name of the Vulnerable Software and Affected Versions libcurl versions prior to 8.0.0

Description An authentication bypass issue exists where libcurl reuses a previously established SSH connection despite the fact that an SSH option was modified. This occurs because libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily and potentially leading to the reuse of an inappropriate connection.

Recommendations For libcurl versions prior to 8.0.0, update to version 8.0.0 or later to resolve the issue. As a temporary workaround, consider disabling the reuse of previously established SSH connections until a patch is available. Restrict access to SSH settings to minimize the risk of exploitation. Avoid using modified SSH options in the affected libcurl versions until the issue is resolved.