CVE-2023-43809

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Summary

CVECVE-2023-43809
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-10-04 21:15:00 UTC
Updated2023-10-10 20:12:00 UTC
DescriptionSoft 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.

Risk And Classification

Problem Types: CWE-287

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Charm Soft Serve All All All All

References

ReferenceSourceLinkTags
Public key authentication bypass despite client-side keypair authn failure when `allow-keyless` is true · Issue #389 · charmbracelet/soft-serve · GitHub MISC github.com
Release v0.6.2 · charmbracelet/soft-serve · GitHub MISC github.com
fix(ssh): add authentication middleware · charmbracelet/soft-serve@407c4ec · GitHub MISC github.com
Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled · Advisory · charmbracelet/soft-serve · GitHub MISC github.com
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