CVE-2023-34243 Windows user name disclosure in TGstation
Attackers can discover Windows usernames by brute-forcing the login endpoint due to distinct responses for valid logons.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-34243?
CVE-2023-34243 is a medium-severity vulnerability in tgstation-server, published on 8 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2023-34243?
It affects 1 product.
Products include Tgstation13 Tgstation-Server.
How do I fix CVE-2023-34243?
No fix has been published for CVE-2023-34243 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-34243 being exploited?
There is no known exploitation of CVE-2023-34243 in the wild and no public exploit code.
Other vulnerabilities in tgstation-server
- CVE-2018-17107 tgstation-server cached user logins in legacy server
- CVE-2025-21611 tgstation-server's role authorization incorrectly OR'd with user's enabled status
- CVE-2024-41799 tgstation-server's DreamMaker environment files outside the deployment directory can be compiled and ran by insufficiently permissioned users
- CVE-2023-32687 Insufficiently Protected ChatBot Credentials in tgstation-server
- CVE-2020-16136 Path traversal in n/a
Sources
Also known as GHSA-w3jx-4x93-76ph.