This could potentially result in unauthorized access to the Soft Serve. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. Soft Serve is a self-hostable Git server for the command line.
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