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.

Weakness classification

• security-advisories@github.com: CWE-287

Primary references

• security-advisories@github.com — Patch
• security-advisories@github.com — Exploit, Issue Tracking
• security-advisories@github.com — Release Notes
• security-advisories@github.com — Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch
• af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes
• af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory