CVE-2023-43809
Description
Soft Serve is a self-hostable Git server for the command line. 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. 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. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.
How to fix
- charm soft_serve0.6.2 or later
- github.com/charmbracelet/soft-serve0.6.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| charm soft_serve | v < 0.6.2 | 0.6.2 |
| github.com/charmbracelet/soft-serveGo | v < 0.6.2 | 0.6.2 |
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