The attacked knows the user's public key and 3. The attacker knows the username and a valid target name 2. This allows bypassing authentication under following conditions: 1. The SSH key verification for a user can be bypassed by sending an SSH key offer without a signature. Warpgate is a smart SSH, HTTPS and MySQL bastion host for Linux that doesn't need special client apps. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.

Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. 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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated This is only exposed when ssh debug is enabled. The BIG-IP SPK TMM (Traffic Management Module) f5-debug-sidecar and f5-debug-sshd containers contains hardcoded credentials that may allow an attacker with the ability to intercept traffic to impersonate the SPK Secure Shell (SSH) server on those containers.

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