CVE-2023-34243: Improper Restriction of Excessive Authentication Attempts

June 8, 2023 (updated June 15, 2023)

TGstation is a toolset to manage production BYOND servers. In affected versions if a Windows user was registered in tgstation-server (TGS), an attacker could discover their username by brute-forcing the login endpoint with an invalid password. When a valid Windows logon was found, a distinct response would be generated. This issue has been addressed in version 5.12.5. Users are advised to upgrade. Users unable to upgrade may be mitigated by rate-limiting API calls with software that sits in front of TGS in the HTTP pipeline such as fail2ban.

References

github.com/tgstation/tgstation-server/pull/1526
github.com/tgstation/tgstation-server/security/advisories/GHSA-w3jx-4x93-76ph
nvd.nist.gov/vuln/detail/CVE-2023-34243

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