cve/2023/CVE-2023-43809.md

### [CVE-2023-43809](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-43809)
![](https://img.shields.io/static/v1?label=Product&message=soft-serve&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%200.6.2%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-287%3A%20Improper%20Authentication&color=brighgreen)

### 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.

### POC

#### Reference
- https://github.com/charmbracelet/soft-serve/issues/389

#### Github
No PoCs found on GitHub currently.