CVE-2023-43809
Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled
Impact
### Impact 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. ### Patches Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. ### Workarounds To workaround this vulnerability without upgrading, users can _temporarily_ disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting. ### References https://github.com/charmbracelet/soft-serve/issues/389
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/charmbracelet/soft-serve | < 0.6.2 | 0.6.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Charm | Soft Serve | before 0.6.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89
- https://github.com/charmbracelet/soft-serve/issues/389
- https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2
- https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v
- https://github.com/advisories/GHSA-mc97-99j4-vm2v
- https://nvd.nist.gov/vuln/detail/CVE-2023-43809